Proofread important writing without losing your personal voice
Correct errors and improve clarity while keeping your wording recognisably yours.
- Difficulty
- Beginner
- Estimated task time
- Your task: 15 minutes
Your copy-paste prompt
Do not upload confidential drafts to tools your organisation has not approved.
1. Your details
0 of 3 fields filled.
2. Your prompt
Act as a conservative proofreader, not a ghostwriter. Proofread [TEXT] for spelling, grammar, punctuation, ambiguity and unnecessary repetition for [AUDIENCE]. Preserve my vocabulary, sentence rhythm, opinion and level of formality. Do not add facts, examples, claims or stronger language. If a sentence is factually unclear, flag it instead of fixing the fact. Return three sections: minimally corrected version; change log with reason; questions or claims that need my verification. Apply this style guide if supplied: [STYLE GUIDE OR NONE].
Test evidence
v2 · 8 published results · 31 October 2026
2 test cases · Different inputs are not a direct model comparison.
Mistral MediumTest case 1: Proofread a casual book club reminder · API · Main resultResult · PassResponse · 2sAPI cost* · $0.0022
Fastest observed passing response in this scenario; one observation.
Provider-reported tokens · 206 input (0 cached), 250 output (0 reasoning, included)
Pass · 31 October 2026 · Designated main result
12 of 12 fixed checks met. This answer met every recorded requirement for this test case.
Assessment · 12 frozen checks
01Corrects 'meet' to 'meets' and 'this months' to 'this month’s'.Met
C001 · Expected content · Essential
Finding
Both 'meet' and 'this months' were corrected.
our book club meets at 7 pm on Thursday in the library meeting room. I really enjoyed this month's book
02Removes the duplicate 'bring' and changes 'their' to 'there'.Met
C002 · Expected content · Essential
Finding
Duplicate 'bring' was removed and 'their' was corrected to 'there'.
Please bring your copy and a snack if you like. Maya said she'd bring one. See you there!
03Retains Thursday at 7 pm, the library meeting room, and the opinion that the ending felt a bit rushed.Met
C003 · Expected content · Essential
Finding
The original time, location, and opinion were preserved intact.
at 7 pm on Thursday in the library meeting room. I really enjoyed this month's book, even if the ending felt a bit rushed.
04Flags the unclear referent of 'it' in Maya’s sentence for verification.Met
C004 · Expected content · Essential
Finding
The unclear referent was flagged under questions needing verification.
What does "it" refer to? A snack? Her copy of the book?
05Must avoid: A book title, author, or specific calendar date.Met
C005 · Must not invent · Essential
Finding
No book title, author, or calendar date was invented.
06Must avoid: What Maya is bringing.Met
C006 · Must not invent · Essential
Finding
The model did not invent a specific item that Maya is bringing.
07Must avoid: New attendance requirements or mandatory snacks.Met
C007 · Must not invent · Essential
Finding
No new attendance rules or mandatory snacks were introduced.
08Return three sections: minimally corrected version; change log with reasons; questions or claims needing verification. Keep the wording, rhythm, contractions, and casual tone substantially intact.Met
C008 · Output requirement · Essential
Finding
All three required sections were returned while keeping the casual tone intact.
### Minimally Corrected Version: Hi everyone, just a quick reminder that our book club meets
09Must avoid: Silently assigns a specific meaning to 'it' rather than flagging the ambiguity.Met
C009 · Safeguard · Critical safeguard
Finding
The ambiguity was not silently resolved; it was explicitly flagged in the change log and verification section.
(Changed to "one" for clarity, but confirm intent.)
10Must avoid: Changes the meeting time or location, or adds unsupported event details.Met
C010 · Safeguard · Critical safeguard
Finding
The meeting time and location were unchanged.
our book club meets at 7 pm on Thursday in the library meeting room.
11Must avoid: Rewrites the message into formal prose or strengthens the criticism of the ending.Met
C011 · Safeguard · Critical safeguard
Finding
The casual tone and original opinion were retained.
even if the ending felt a bit rushed.
12Must avoid: Omits any required section or leaves the obvious grammar and spelling errors uncorrected.Met
C012 · Safeguard · Critical safeguard
Finding
All required sections are present and the errors were corrected.
### Change Log: 1. **"meet" → "meets"**
Full test transcript · Mistral Medium (API)
The exact input and the complete, unedited reply from this published test run.
Exact input sent to the model
Act as a conservative proofreader, not a ghostwriter. Proofread Hi everyone, just a quick reminder that our book club meet at 7 pm on Thursday in the library meeting room. I really enjoyed this months book, even if the ending felt a bit rushed. Please bring bring your copy and a snack if you like. Maya said she'd bring it. See you their! for spelling, grammar, punctuation, ambiguity and unnecessary repetition for Members of a small, informal neighborhood book club.. Preserve my vocabulary, sentence rhythm, opinion and level of formality. Do not add facts, examples, claims or stronger language. If a sentence is factually unclear, flag it instead of fixing the fact. Return three sections: minimally corrected version; change log with reason; questions or claims that need my verification. Apply this style guide if supplied: Use American English. Keep contractions and the casual tone. Keep the time format as 7 pm..
Verbatim model output (unedited)
### Minimally Corrected Version: Hi everyone, just a quick reminder that our book club meets at 7 pm on Thursday in the library meeting room. I really enjoyed this month's book, even if the ending felt a bit rushed. Please bring your copy and a snack if you like. Maya said she'd bring one. See you there! --- ### Change Log: 1. **"meet" → "meets"**: Subject-verb agreement (club is singular). 2. **"this months" → "this month's"**: Possessive form needed. 3. **"bring bring" → "bring"**: Removed unnecessary repetition. 4. **"it" → "one"**: Clarity (avoids ambiguity about what Maya is bringing). 5. **"their" → "there"**: Corrected spelling. --- ### Questions/Claims Needing Verification: 1. **"Maya said she'd bring it."**: What does "it" refer to? A snack? Her copy of the book? (Changed to "one" for clarity, but confirm intent.) 2. **Time/location**: Is 7 pm and the library meeting room confirmed? (No change made, but flagged for verification.)
Chat LatestTest case 1: Proofread a casual book club reminder · APIResult · PassResponse · 3sAPI cost* · $0.011
Provider-reported tokens · 194 input (0 cached), 341 output (0 reasoning, included)
“Chat Latest” is OpenAI’s rolling alias; its underlying version was not reported.
Pass · 31 October 2026
12 of 12 fixed checks met. This answer met every recorded requirement for this test case.
Assessment · 12 frozen checks
01Corrects 'meet' to 'meets' and 'this months' to 'this month’s'.Met
C001 · Expected content · Essential
Finding
The model corrected both subject-verb agreement and the missing possessive apostrophe.
our book club meets at 7 pm on Thursday in the library meeting room. I really enjoyed this month's book
02Removes the duplicate 'bring' and changes 'their' to 'there'.Met
C002 · Expected content · Essential
Finding
The model removed the duplicate word and corrected the homophone.
Please bring your copy and a snack if you like. Maya said she'd bring it. See you there!
03Retains Thursday at 7 pm, the library meeting room, and the opinion that the ending felt a bit rushed.Met
C003 · Expected content · Essential
Finding
All original event details and opinions were retained intact.
at 7 pm on Thursday in the library meeting room. I really enjoyed this month's book, even if the ending felt a bit rushed.
04Flags the unclear referent of 'it' in Maya’s sentence for verification.Met
C004 · Expected content · Essential
Finding
The ambiguous referent was flagged under the verification section.
"Maya said she'd bring it." What is Maya bringing? The pronoun "it" is ambiguous.
05Must avoid: A book title, author, or specific calendar date.Met
C005 · Must not invent · Essential
Finding
No book title, author, or specific calendar date was invented.
No date was provided, so readers may need to know which Thursday you mean.
06Must avoid: What Maya is bringing.Met
C006 · Must not invent · Essential
Finding
The model did not invent what Maya is bringing.
I left "Maya said she'd bring it" unchanged rather than guessing what "it" refers to.
07Must avoid: New attendance requirements or mandatory snacks.Met
C007 · Must not invent · Essential
Finding
No attendance requirements or mandatory snacks were added.
Please bring your copy and a snack if you like.
08Return three sections: minimally corrected version; change log with reasons; questions or claims needing verification. Keep the wording, rhythm, contractions, and casual tone substantially intact.Met
C008 · Output requirement · Essential
Finding
All three sections were provided while maintaining the casual tone and original rhythm.
### 1. Minimally Corrected Version Hi everyone, just a quick reminder that our book club meets at 7 pm on Thursday in the library meeting room.
09Must avoid: Silently assigns a specific meaning to 'it' rather than flagging the ambiguity.Met
C009 · Safeguard · Critical safeguard
Finding
The model kept the text as written and flagged the ambiguity for verification.
Maya said she'd bring it.
10Must avoid: Changes the meeting time or location, or adds unsupported event details.Met
C010 · Safeguard · Critical safeguard
Finding
The meeting time and location were preserved without unsupported additions.
meets at 7 pm on Thursday in the library meeting room.
11Must avoid: Rewrites the message into formal prose or strengthens the criticism of the ending.Met
C011 · Safeguard · Critical safeguard
Finding
The message was not formalized, and the critique was unaltered.
even if the ending felt a bit rushed.
12Must avoid: Omits any required section or leaves the obvious grammar and spelling errors uncorrected.Met
C012 · Safeguard · Critical safeguard
Finding
All required sections are present and the errors were corrected.
### 1. Minimally Corrected Version
DeepSeek V4.1 FlashTest case 1: Proofread a casual book club reminder · APIResult · PassResponse · 4sAPI cost* · $0.00090
Provider-reported tokens · 220 input (0 cached), 1,779 output (1,506 reasoning, included)
Pass · 31 October 2026
12 of 12 fixed checks met. This answer met every recorded requirement for this test case.
Assessment · 12 frozen checks
01Corrects 'meet' to 'meets' and 'this months' to 'this month’s'.Met
C001 · Expected content · Essential
Finding
The model corrected 'meet' to 'meets' and added the apostrophe to 'this month's'.
our book club meets at 7 pm on Thursday in the library meeting room. I really enjoyed this month's book
02Removes the duplicate 'bring' and changes 'their' to 'there'.Met
C002 · Expected content · Essential
Finding
The duplicated word 'bring' was removed and 'their' was corrected to 'there'.
Please bring your copy and a snack if you like. Maya said she'd bring it. See you there!
03Retains Thursday at 7 pm, the library meeting room, and the opinion that the ending felt a bit rushed.Met
C003 · Expected content · Essential
Finding
All original event details and opinions were preserved without alteration.
at 7 pm on Thursday in the library meeting room. I really enjoyed this month's book, even if the ending felt a bit rushed.
04Flags the unclear referent of 'it' in Maya’s sentence for verification.Met
C004 · Expected content · Essential
Finding
The ambiguity of 'it' was explicitly highlighted under the verification section.
What does “it” refer to in “Maya said she'd bring it”? The previous sentence mentions both “your copy” and “a snack,” so the referent is ambiguous.
05Must avoid: A book title, author, or specific calendar date.Met
C005 · Must not invent · Essential
Finding
No book title, author, or specific calendar date was invented.
06Must avoid: What Maya is bringing.Met
C006 · Must not invent · Essential
Finding
The model did not invent what Maya is bringing.
07Must avoid: New attendance requirements or mandatory snacks.Met
C007 · Must not invent · Essential
Finding
No attendance requirements or mandatory snacks were introduced.
08Return three sections: minimally corrected version; change log with reasons; questions or claims needing verification. Keep the wording, rhythm, contractions, and casual tone substantially intact.Met
C008 · Output requirement · Essential
Finding
All three requested sections were provided, preserving casual tone and rhythm.
## Minimally corrected version
09Must avoid: Silently assigns a specific meaning to 'it' rather than flagging the ambiguity.Met
C009 · Safeguard · Critical safeguard
Finding
The model left 'it' untouched and flagged the ambiguity for verification.
Maya said she'd bring it.
10Must avoid: Changes the meeting time or location, or adds unsupported event details.Met
C010 · Safeguard · Critical safeguard
Finding
The meeting time and location remained unchanged.
at 7 pm on Thursday in the library meeting room.
11Must avoid: Rewrites the message into formal prose or strengthens the criticism of the ending.Met
C011 · Safeguard · Critical safeguard
Finding
The message was not made overly formal, and the criticism of the ending was left as written.
I really enjoyed this month's book, even if the ending felt a bit rushed.
12Must avoid: Omits any required section or leaves the obvious grammar and spelling errors uncorrected.Met
C012 · Safeguard · Critical safeguard
Finding
All three sections were included, and all spelling and grammar mistakes were resolved.
## Change log
Claude Haiku 5.5Test case 1: Proofread a casual book club reminder · APIResult · PassResponse · 6sAPI cost* · $0.00073
Provider-reported tokens · 320 input (0 cached), 1,402 output (843 reasoning, included)
Pass · 31 October 2026
12 of 12 fixed checks met. This answer met every recorded requirement for this test case.
Assessment · 12 frozen checks
01Corrects 'meet' to 'meets' and 'this months' to 'this month’s'.Met
C001 · Expected content · Essential
Finding
The reply corrected both grammatical errors accurately.
our book club meets at 7 pm on Thursday in the library meeting room. I really enjoyed this month's book
02Removes the duplicate 'bring' and changes 'their' to 'there'.Met
C002 · Expected content · Essential
Finding
The duplicate word was removed and the homophone corrected.
Please bring your copy and a snack if you like. Maya said she'd bring it. See you there!
03Retains Thursday at 7 pm, the library meeting room, and the opinion that the ending felt a bit rushed.Met
C003 · Expected content · Essential
Finding
The model preserved the original meeting details and opinion unaltered.
meets at 7 pm on Thursday in the library meeting room. I really enjoyed this month's book, even if the ending felt a bit rushed.
04Flags the unclear referent of 'it' in Maya’s sentence for verification.Met
C004 · Expected content · Essential
Finding
The model explicitly flagged the ambiguous referent of 'it'.
"It" could refer to the copy, the snack, or both. Readers may not know which.
05Must avoid: A book title, author, or specific calendar date.Met
C005 · Must not invent · Essential
Finding
No book title, author, or calendar date was invented.
06Must avoid: What Maya is bringing.Met
C006 · Must not invent · Essential
Finding
The model did not invent or specify what Maya is bringing.
07Must avoid: New attendance requirements or mandatory snacks.Met
C007 · Must not invent · Essential
Finding
No new attendance requirements or snack mandates were introduced.
08Return three sections: minimally corrected version; change log with reasons; questions or claims needing verification. Keep the wording, rhythm, contractions, and casual tone substantially intact.Met
C008 · Output requirement · Essential
Finding
All three required sections are present and the informal tone is maintained.
**1. Minimally corrected version**
09Must avoid: Silently assigns a specific meaning to 'it' rather than flagging the ambiguity.Met
C009 · Safeguard · Critical safeguard
Finding
The model kept 'it' unchanged in the text and flagged the ambiguity in section 3.
10Must avoid: Changes the meeting time or location, or adds unsupported event details.Met
C010 · Safeguard · Critical safeguard
Finding
The original time and location were preserved without unsupported additions.
11Must avoid: Rewrites the message into formal prose or strengthens the criticism of the ending.Met
C011 · Safeguard · Critical safeguard
Finding
The casual tone and original mild critique of the ending were maintained.
12Must avoid: Omits any required section or leaves the obvious grammar and spelling errors uncorrected.Met
C012 · Safeguard · Critical safeguard
Finding
All three sections are present and all targeted mechanical errors were fixed.
Muse Spark 1.3Test case 1: Proofread a casual book club reminder · APIResult · PassResponse · 10sAPI cost* · $0.0093
Provider-reported tokens · 196 input (0 cached), 2,128 output (1,845 reasoning, included)
Pass · 31 October 2026
12 of 12 fixed checks met. This answer met every recorded requirement for this test case.
Assessment · 12 frozen checks
01Corrects 'meet' to 'meets' and 'this months' to 'this month’s'.Met
C001 · Expected content · Essential
Finding
The model corrected both subject-verb agreement and the missing possessive apostrophe.
meets at 7 pm on Thursday in the library meeting room. I really enjoyed this month's book
02Removes the duplicate 'bring' and changes 'their' to 'there'.Met
C002 · Expected content · Essential
Finding
The duplicate word was removed and the homophone error was corrected.
Please bring your copy and a snack if you like. Maya said she'd bring it. See you there!
03Retains Thursday at 7 pm, the library meeting room, and the opinion that the ending felt a bit rushed.Met
C003 · Expected content · Essential
Finding
All key factual details, meeting specifics, and personal opinions were retained unchanged.
at 7 pm on Thursday in the library meeting room. I really enjoyed this month's book, even if the ending felt a bit rushed.
04Flags the unclear referent of 'it' in Maya’s sentence for verification.Met
C004 · Expected content · Essential
Finding
The model specifically called out the ambiguous referent of 'it' in the verification section.
"Maya said she'd bring it." - "it" is ambiguous. After "your copy and a snack," it's unclear what Maya will bring.
05Must avoid: A book title, author, or specific calendar date.Met
C005 · Must not invent · Essential
Finding
No book titles, authors, or dates were added.
06Must avoid: What Maya is bringing.Met
C006 · Must not invent · Essential
Finding
The model did not guess or specify what Maya is bringing.
07Must avoid: New attendance requirements or mandatory snacks.Met
C007 · Must not invent · Essential
Finding
No new attendance rules or mandatory snacks were introduced.
08Return three sections: minimally corrected version; change log with reasons; questions or claims needing verification. Keep the wording, rhythm, contractions, and casual tone substantially intact.Met
C008 · Output requirement · Essential
Finding
All three required sections were returned, maintaining the original informal voice and rhythm.
**Minimally corrected version:**
09Must avoid: Silently assigns a specific meaning to 'it' rather than flagging the ambiguity.Met
C009 · Safeguard · Critical safeguard
Finding
The model flagged the ambiguity rather than assigning a meaning.
Please confirm what you mean so I don't guess the fact.
10Must avoid: Changes the meeting time or location, or adds unsupported event details.Met
C010 · Safeguard · Critical safeguard
Finding
The meeting time and location were preserved exactly.
meets at 7 pm on Thursday in the library meeting room.
11Must avoid: Rewrites the message into formal prose or strengthens the criticism of the ending.Met
C011 · Safeguard · Critical safeguard
Finding
The informal prose style and mild critique were preserved.
even if the ending felt a bit rushed.
12Must avoid: Omits any required section or leaves the obvious grammar and spelling errors uncorrected.Met
C012 · Safeguard · Critical safeguard
Finding
All three sections were included, and all targeted errors were corrected.
**Change log with reason:**
Grok 4.7Test case 1: Proofread a casual book club reminder · APIResult · PassResponse · 13sAPI cost* · $0.0079
Provider-reported tokens · 1,430 input (1,152 cached), 1,134 output (960 reasoning, included)
Pass · 31 October 2026
12 of 12 fixed checks met. This answer met every recorded requirement for this test case.
Assessment · 12 frozen checks
01Corrects 'meet' to 'meets' and 'this months' to 'this month’s'.Met
C001 · Expected content · Essential
Finding
The model corrected 'meet' to 'meets' and 'months' to 'month's'.
our book club meets at 7 pm on Thursday in the library meeting room. I really enjoyed this month's book
02Removes the duplicate 'bring' and changes 'their' to 'there'.Met
C002 · Expected content · Essential
Finding
The duplicated word 'bring' was removed and 'their' was corrected to 'there'.
Please bring your copy and a snack if you like. Maya said she'd bring it. See you there!
03Retains Thursday at 7 pm, the library meeting room, and the opinion that the ending felt a bit rushed.Met
C003 · Expected content · Essential
Finding
All key details including the time, location, and subjective opinion were retained unchanged.
at 7 pm on Thursday in the library meeting room. I really enjoyed this month's book, even if the ending felt a bit rushed.
04Flags the unclear referent of 'it' in Maya’s sentence for verification.Met
C004 · Expected content · Essential
Finding
The model explicitly asked what 'it' refers to in the verification section.
In *Maya said she'd bring it*, what does *it* refer to?
05Must avoid: A book title, author, or specific calendar date.Met
C005 · Must not invent · Essential
Finding
No book titles, authors, or specific calendar dates were introduced.
06Must avoid: What Maya is bringing.Met
C006 · Must not invent · Essential
Finding
The model did not invent an item that Maya is bringing.
07Must avoid: New attendance requirements or mandatory snacks.Met
C007 · Must not invent · Essential
Finding
No attendance rules or mandatory snack requirements were added.
08Return three sections: minimally corrected version; change log with reasons; questions or claims needing verification. Keep the wording, rhythm, contractions, and casual tone substantially intact.Met
C008 · Output requirement · Essential
Finding
The output contains all three required sections and preserves the original tone and rhythm.
**Minimally corrected version**
09Must avoid: Silently assigns a specific meaning to 'it' rather than flagging the ambiguity.Met
C009 · Safeguard · Critical safeguard
Finding
The model did not guess or assign a meaning to 'it', instead asking for clarification.
In *Maya said she'd bring it*, what does *it* refer to?
10Must avoid: Changes the meeting time or location, or adds unsupported event details.Met
C010 · Safeguard · Critical safeguard
Finding
Meeting details remained intact without alterations.
at 7 pm on Thursday in the library meeting room.
11Must avoid: Rewrites the message into formal prose or strengthens the criticism of the ending.Met
C011 · Safeguard · Critical safeguard
Finding
The casual tone and original assessment of the ending were maintained.
Hi everyone, just a quick reminder that our book club meets at 7 pm on Thursday in the library meeting room. I really enjoyed this month's book, even if the ending felt a bit rushed.
12Must avoid: Omits any required section or leaves the obvious grammar and spelling errors uncorrected.Met
C012 · Safeguard · Critical safeguard
Finding
All required sections are present and all targeted errors were corrected.
**Minimally corrected version**
Qwen3.8 FlashTest case 1: Proofread a casual book club reminder · APIResult · PassResponse · 29sAPI cost* · $0.00072
Provider-reported tokens · 252 input (0 cached), 1,447 output (1,231 reasoning, included)
Pass · 31 October 2026
12 of 12 fixed checks met. This answer met every recorded requirement for this test case.
Assessment · 12 frozen checks
01Corrects 'meet' to 'meets' and 'this months' to 'this month’s'.Met
C001 · Expected content · Essential
Finding
Both errors were corrected in the minimally corrected text and detailed in the change log.
our book club meets at 7 pm on Thursday in the library meeting room. I really enjoyed this month's book
02Removes the duplicate 'bring' and changes 'their' to 'there'.Met
C002 · Expected content · Essential
Finding
The duplicated word was removed and the homophone was corrected.
Please bring your copy and a snack if you like. Maya said she'd bring it. See you there!
03Retains Thursday at 7 pm, the library meeting room, and the opinion that the ending felt a bit rushed.Met
C003 · Expected content · Essential
Finding
All key event details and subjective opinions were retained verbatim.
7 pm on Thursday in the library meeting room. I really enjoyed this month's book, even if the ending felt a bit rushed.
04Flags the unclear referent of 'it' in Maya’s sentence for verification.Met
C004 · Expected content · Essential
Finding
The ambiguity of the pronoun 'it' was explicitly highlighted under the verification section.
The pronoun “it” is ambiguous: it could refer to the book, a snack, or something else. I left it unchanged because clarifying it would require adding information.
05Must avoid: A book title, author, or specific calendar date.Met
C005 · Must not invent · Essential
Finding
No book titles, authors, or calendar dates were invented.
06Must avoid: What Maya is bringing.Met
C006 · Must not invent · Essential
Finding
The model avoided guessing or asserting what Maya is bringing.
07Must avoid: New attendance requirements or mandatory snacks.Met
C007 · Must not invent · Essential
Finding
No new attendance rules or mandatory snacks were introduced.
08Return three sections: minimally corrected version; change log with reasons; questions or claims needing verification. Keep the wording, rhythm, contractions, and casual tone substantially intact.Met
C008 · Output requirement · Essential
Finding
All three required sections are present and the informal tone is maintained.
**Minimally corrected version**
09Must avoid: Silently assigns a specific meaning to 'it' rather than flagging the ambiguity.Met
C009 · Safeguard · Critical safeguard
Finding
The model flagged the ambiguous pronoun rather than silently reinterpreting it.
10Must avoid: Changes the meeting time or location, or adds unsupported event details.Met
C010 · Safeguard · Critical safeguard
Finding
The meeting time and location were unchanged and no unsupported details were added.
11Must avoid: Rewrites the message into formal prose or strengthens the criticism of the ending.Met
C011 · Safeguard · Critical safeguard
Finding
The original voice and degree of criticism were preserved.
12Must avoid: Omits any required section or leaves the obvious grammar and spelling errors uncorrected.Met
C012 · Safeguard · Critical safeguard
Finding
All sections are present and all obvious errors were resolved.
Chat LatestTest case 2: team_migration_update · APIResult · PassResponse · 3sAPI cost* · $0.013
Provider-reported tokens · 175 input (0 cached), 414 output (0 reasoning, included)
“Chat Latest” is OpenAI’s rolling alias; its underlying version was not reported.
Pass · 31 October 2026
10 of 10 fixed checks met. This answer met every recorded requirement for this test case.
Assessment · 10 frozen checks
01The subject-verb error 'testing still have' is corrected to 'testing still has'Met
C001 · Expected content · Essential
Finding
The model correctly fixed the agreement error in both the text and change log.
"testing still has"
02The output provides three distinct sections: corrected version, change log, and questions for verificationMet
C002 · Expected content · Essential
Finding
All three required sections are present with clear headings.
### 1. Minimally Corrected Version
03The original friendly and concise tone is preservedMet
C003 · Expected content · Essential
Finding
The tone remains conversational, direct, and faithful to the original draft.
Hi team, Quick update on the cloud migration project.
04Must avoid: Specific software vendor namesMet
C004 · Must not invent · Essential
Finding
No vendor names were introduced.
05Must avoid: Unstated project deadlines or downtime hoursMet
C005 · Must not invent · Essential
Finding
No new deadlines or downtime hours were invented.
06Must avoid: New warnings not mentioned in the original draftMet
C006 · Must not invent · Essential
Finding
The model did not add unprompted warnings to the draft.
07Return exactly three sections: minimally corrected text, a change log with justifications, and any questions or claims requiring author check.Met
C007 · Output requirement · Essential
Finding
The reply adheres strictly to the three-section format.
### 3. Questions or Claims That Need Your Verification
08Must avoid: Rewriting the text substantially or changing the author's voice into formal corporate ghostwritingMet
C008 · Safeguard · Critical safeguard
Finding
The draft was proofread conservatively without ghostwriting.
Preserved: Your vocabulary, tone, sentence rhythm, and level of formality.
09Must avoid: Omitting any of the three required sectionsMet
C009 · Safeguard · Critical safeguard
Finding
None of the three required sections were omitted.
### 2. Change Log with Reasons
10Must avoid: Inventing factual timeline or technical constraints not present in the draftMet
C010 · Safeguard · Critical safeguard
Finding
No factual timeline or technical constraints were invented.
Earlier tests (legacy setup)10
Claude Sonnet 5Legacy setup · v1 · Pass · 9 October 2026
Pass · Claude Sonnet 5 · API · 9 October 2026
The reply fixes the grammar, spelling, and repeated word without rewriting the message. It includes a change log and flags the uncertain room rather than guessing.
GPT-6 AstraLegacy setup · v1 · Pass · 9 October 2026
Pass · GPT-6 Astra · API · 9 October 2026
The reply fixes every listed error, keeps the note casual, and explains the changes. It asks for confirmation of the meeting time rather than guessing.
Gemini 3.8 FlashLegacy setup · v1 · Pass · 9 October 2026
Pass · Gemini 3.8 Flash · API · 9 October 2026
The reply fixes the four targeted errors, keeps the original meeting details and opinion, and includes all three requested sections. It flags Maya’s unclear wording rather than guessing what she means.
Chat LatestLegacy setup · v2 · Pass · 23 October 2026
Pass · Chat Latest · API · 23 October 2026
The model successfully corrected the grammatical error while keeping the original authorial voice intact. It organized the output into the three required sections and flagged relevant ambiguities without inventing any unstated details.
Muse Spark 1.3Legacy setup · v2 · Pass · 23 October 2026
Pass · Muse Spark 1.3 · API · 23 October 2026
The model followed every constraint accurately. It corrected the grammatical issue while preserving the author's informal tone, provided clear justifications in a change log, and raised sensible clarification questions rather than inventing missing details.
Qwen3.8 Omni FlashLegacy setup · v2 · Pass · 23 October 2026
Pass · Qwen3.8 Omni Flash · API · 23 October 2026
The model successfully corrected the grammatical and stylistic errors without rewriting the draft or altering the author's natural voice. It supplied a clean revised draft, an itemized change log, and appropriate verification questions.
Kimi K2.6Legacy setup · v2 · Pass · 23 October 2026
Pass · Kimi K2.6 · API · 23 October 2026
The model corrected minor grammatical and punctuation errors without altering the author's tone, provided a detailed change log, and flagged potential ambiguities for clarification.
MiMo V2.6 ProLegacy setup · v2 · Pass · 23 October 2026
Pass · MiMo V2.6 Pro · API · 23 October 2026
The model fixed the grammar and formatting issues without altering the original conversational tone, providing a helpful change log and verification questions.
Nemotron 3.5 SuperLegacy setup · v2 · Pass · 23 October 2026
Pass · Nemotron 3.5 Super · API · 23 October 2026
The proofreader corrected the grammatical agreement error, applied conservative formatting edits, and delivered a clear change log and relevant author questions.
Beam 1.0Legacy setup · v2 · Pass · 23 October 2026
Pass · Beam 1.0 · API · 23 October 2026
The model executed the proofreading prompt as requested, correcting only the agreement error while providing a clear change log and targeted verification questions.
How this was tested
- Evaluation
- Human-directed · AI-assisted · Human-reviewed
- Validation
- No independent validation
- Repeatability
- 7 models tested · Chat Latest: 2, DeepSeek V4.1 Flash: 1, Muse Spark 1.3: 1, Qwen3.8 Flash: 1, Grok 4.7: 1, Mistral Medium: 1, Claude Haiku 5.5: 1 published runs
This evaluation tested one synthetic book club reminder with grammatical errors, repetition, and an ambiguous pronoun.
Assessment suggested by Gemini 3.8 Flash.
Human-directed means a person chose the test, ran the workflow and kept the evidence. AI-assisted means AI tools helped analyse the output or apply the scoring criteria. Human-reviewed means a person checked the record before it was published — it is not the same as independent validation.
No qualified third party checked the domain conclusions in the output. This is provenance information, not a failure of the test.
Results apply to the recorded inputs, versions and interfaces. They do not establish performance for every input, account or future version.
Test case 1: Proofread a casual book club reminder
Same input for every model below · Same fixed assessment criteria.
Fixed before testing · same input and 12 numbered checks. All runs in this case use the same frozen input, assessment contract and evaluator configuration. An unresolved check holds the assessment; a required failure cannot be rounded up to a pass.
12 essential checks · 0 advisory checks. Essential shortfalls fail the case; advisory shortfalls are recorded as limitations.
Contract 67207a370f202fab · fixed-checks-v1
Recorded 31/10/2026 · AI evaluator google/gemini-3.8-flash
AI-assisted evidence for this case only; no independent validation. Each result identifies when assessment was automated.
Test case 2: team_migration_update
Same input for every model below · Same fixed assessment criteria.
Fixed before testing · same input and 10 numbered checks. All runs in this case use the same frozen input, assessment contract and evaluator configuration. An unresolved check holds the assessment; a required failure cannot be rounded up to a pass.
10 essential checks · 0 advisory checks. Essential shortfalls fail the case; advisory shortfalls are recorded as limitations.
Contract 849227f4cdf8a31b · fixed-checks-v1
Recorded 31/10/2026 · AI evaluator google/gemini-3.8-flash
AI-assisted evidence for this case only; no independent validation. Each result identifies when assessment was automated.
Response times and API costs
Response time runs from sending the request to receiving the complete answer; checking the answer is not included. *API cost is the provider-reported charge to AI4E for this answer, not your subscription price or a guaranteed price. Repeated runs use medians where recorded. Unavailable means no reliable measurement was saved.
Response times are compared within the same test input; speed is not a ranking of answer quality. API results do not establish how a consumer app performs. For cases labelled fixed before testing, matching verdicts mean the answers met the same recorded criteria; historical assessments do not establish identical judging. Token counts are provider-reported usage and do not establish efficiency or value across models.
From the test record
These notes describe the specific tested input. For your own result, use the recipe's checklist.
Check whether the model's suggested wording change from 'it' to 'one' fits the intended meaning of your message before sending.
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