Claude Opus 4.6 (Reasoning)

anthropic/claude-opus-4.6

Claude Opus 4.6 (Reasoning)

via OpenRouter

Release Date

Feb 4th, 2026

Context Size

Benchmark Cost

$44.01

Speed

54.5 tok/s

Creative writing

82.72%

Rule following

93.67%

Utility

95.22%

Mathematics

100.00%

Tooling

97.64%

Language

98.29%

Logic

91.95%

Bad Writing Habits

Detects common prose quality anti-patterns in AI-generated creative writing, including passive voice, past progressive overuse, weak dialogue tags, filter words, purple prose, cliches, AI-ism words/adverbs/names, and more.

Scenario	#1	#2	#3	#4	#5	Total
Detailed Writing Rules
Fantasy: entering an ancient ruin Creative writingRule following	87	85	84	84	83	85%
Horror: alone in an eerie place at night Creative writingRule following	90	89	88	87	86	88%
Literary fiction: old friends reunite Creative writingRule following	90	87	84	83	81	85%
Mystery: examining a crime scene Creative writingRule following	94	94	92	89	89	92%
Romance: separated couple reunites Creative writingRule following	91	91	89	89	85	89%
Thriller: chase through city streets Creative writingRule following	93	93	89	88	88	90%
Detailed Writing Rules						88.04%
genre
Fantasy: entering an ancient ruin Creative writingRule following	82	80	78	76	74	78%
Horror: alone in an eerie place at night Creative writingRule following	86	83	83	82	82	83%
Literary fiction: old friends reunite Creative writingRule following	81	80	78	78	74	78%
Mystery: examining a crime scene Creative writingRule following	84	84	81	79	76	81%
Romance: separated couple reunites Creative writingRule following	82	80	79	75	75	78%
Thriller: chase through city streets Creative writingRule following	85	82	81	79	78	81%
genre						79.94%
Novelcrafter Default Prompt
Fantasy: entering an ancient ruin Creative writingRule following	88	86	85	84	79	84%
Horror: alone in an eerie place at night Creative writingRule following	87	85	82	79	77	82%
Literary fiction: old friends reunite Creative writingRule following	85	83	80	78	77	81%
Mystery: examining a crime scene Creative writingRule following	89	86	85	84	84	86%
Romance: separated couple reunites Creative writingRule following	88	87	86	82	80	85%
Thriller: chase through city streets Creative writingRule following	83	83	83	82	80	82%
Novelcrafter Default Prompt						83.25%
83.74%

Codex Extraction

Evaluates a model's ability to extract structured codex entries (characters, locations, objects, lore) from prose passages and return them as well-formed XML.

Scenario	#1	#2	#3	#4	#5	Total
Long: The Spire of Echoes (Dense) UtilityRule following	99	98	98	98	97	98%
Medium: The Hollow (Inferred) UtilityRule following	100	99	99	99	97	99%
Medium: Through the Thornveil (Scattered) UtilityRule following	99	99	99	99	99	99%
Short: The Rusty Lantern (Explicit) UtilityRule following	99	99	99	99	99	99%
98.48%

Codex Red Herring (False Positive Detection)

Tests whether models correctly report "no violations" when a codex is fully consistent with the prose passage. Models that hallucinate false violations (false positives) fail. Uses a 2×2 matrix of text length × codex size, with bare and detailed-entry variants.

Scenario	#1	#2	#3	#4	#5	#6	#7	#8	#9	#10	Total
basic entries
Long text (~1594 words), big codex (51 entries) ToolingUtilityLogicRule following	100	100	100	100	100	100	100	100	100	100	100%
Long text (~1594 words), small codex (11 entries) ToolingUtilityLogicRule following	100	100	100	100	100	100	100	100	100	100	100%
Short text (~524 words), big codex (51 entries) ToolingUtilityLogicRule following	100	100	100	100	100	100	100	100	100	100	100%
Short text (~524 words), small codex (11 entries) ToolingUtilityLogicRule following	100	100	100	100	100	100	100	100	100	100	100%
basic entries											100.00%
detailed entries
Long text (~1594 words), big codex (51 detailed entries) ToolingUtilityLogicRule following	100	100	100	100	100	100	100	100	100	100	100%
Long text (~1594 words), small codex (11 detailed entries) ToolingUtilityLogicRule following	100	100	100	100	100	100	100	100	100	100	100%
Short text (~524 words), big codex (51 detailed entries) ToolingUtilityLogicRule following	100	100	100	100	100	100	25	25	25	25	70%
Short text (~524 words), small codex (11 detailed entries) ToolingUtilityLogicRule following	100	100	100	100	100	100	100	100	25	25	85%
detailed entries											88.75%
94.38%

Codex Violation Detection

Detects factual inconsistencies between a story bible and prose passages. The model must output structured XML identifying each violation with paragraph number and substring.

Scenario	#1	#2	#3	#4	#5	#6	#7	#8	#9	#10	Total
matrix
Large codex (40 entries), long passage (1,019 words) ToolingUtilityLogicRule following	98	97	97	97	97	97	96	95	94	94	96%
Large codex (40 entries), short passage (165 words) ToolingUtilityLogicRule following	100	100	98	98	98	96	94	94	94	94	97%
Small codex (7 entries), long passage (734 words) ToolingUtilityLogicRule following	100	100	100	100	100	100	100	100	92	92	98%
Small codex (7 entries), short passage (165 words) ToolingUtilityLogicRule following	100	100	100	100	100	100	100	100	100	97	100%
matrix											97.70%
tiers
5 codex entries ToolingUtilityLogicRule following	100	100	100	100	100	100	100	100	100	100	100%
10 codex entries ToolingUtilityLogicRule following	100	100	100	100	100	100	100	100	100	100	100%
20 codex entries ToolingUtilityLogicRule following	100	100	100	100	100	100	100	100	100	100	100%
40 codex entries ToolingUtilityLogicRule following	100	100	100	100	100	100	100	100	100	100	100%
tiers											100.00%
98.85%

Data extraction

Extract key details from a given block of text.

Scenario	#1	#2	#3	#4	#5	#6	#7	#8	#9	#10	Total
All valid emails Utility	100	100	100	100	100	100	100	100	100	100	100%
Contextual pronoun Utility	100	100	100	100	100	100	100	100	100	100	100%
Fruits excluding citrus Utility	100	100	100	100	100	100	100	100	100	100	100%
Future event time UtilityLogic	50	50	50	50	50	50	50	50	50	50	50%
Guess the pet UtilityLogic	100	100	100	100	100	100	100	100	100	100	100%
Highest-rated movie Utility	100	100	100	100	100	100	100	100	100	100	100%
Indirect birth year UtilityMathematicsLogic	100	100	100	100	100	100	100	100	100	100	100%
What instrument does Lucy play? UtilityLogic	100	100	100	100	100	100	100	100	100	100	100%
What's the color of the car? UtilityLogic	100	100	100	100	100	100	100	100	100	100	100%
What's the correct time? UtilityLogic	0	0	0	0	0	0	0	0	0	0	0%
Who's the sister? UtilityLogic	100	100	100	100	100	100	100	100	100	100	100%
Who's the tallest? UtilityLogic	100	100	100	100	100	100	100	100	100	100	100%
87.50%

Dialogue tags

Various tasks related to dialogue tags in text.

Scenario	#1	#2	#3	#4	#5	#6	#7	#8	#9	#10	Total
dialogue-200
Write 200 words with 10% dialogue Creative writingRule following	100	100	100	100	100	100	100	100	100	100	100%
Write 200 words with 50% dialogue Creative writingRule following	100	100	100	99	99	99	98	95	61	50	90%
Write 200 words with 90% dialogue Creative writingRule following	100	100	100	100	98	98	95	88	81	80	94%
dialogue-200											94.64%
dialogue-500
Write 500 words with 30% dialogue Creative writingRule following	100	100	99	96	87	83	38	36	24	13	68%
Write 500 words with 50% dialogue Creative writingRule following	86	80	75	66	53	50	50	48	18	1	53%
Write 500 words with 70% dialogue Creative writingRule following	91	86	86	56	55	53	48	34	34	22	57%
dialogue-500											58.90%
Ungrouped
Write unattributed dialogue Creative writingRule following	100	100	100	100	100	100	100	100	100	100	100%
80.09%

Language Comprehension

Does the model understand more than just English?

Scenario	#1	#2	#3	#4	#5	Total
Asking for directions (Dutch) Language	100	100	100	100	100	100%
Asking for directions (German) Language	100	100	100	100	100	100%
Friend got new kittens (German) Language	100	100	100	100	100	100%
Friend got new kittens (Tagalog) Language	100	100	100	100	100	100%
100.00%

Language Writing

Can the model generate text in different languages?

Scenario	#1	#2	#3	#4	#5	Total
Character dialogue (French) in a story Language	100	100	100	100	100	100%
Character dialogue (German) in a story Language	100	100	100	100	100	100%
Character dialogue (Hindi) in a story Language	100	55	52	52	52	62%
Character dialogue (Italian) in a story Language	100	100	100	100	100	100%
Character dialogue (Spanish) in a story Language	100	100	100	100	96	99%
92.23%

N-Length Sentences

Write sentences with exactly N words

Scenario	#1	#2	#3	#4	#5	#6	#7	#8	#9	#10	Total
Write sentences with 5 words each Rule following	100	100	100	100	100	100	100	100	100	100	100%
Write sentences with 10 words each Rule following	100	100	100	100	100	100	100	100	98	94	99%
Write sentences with 20 words each Rule following	100	100	100	100	100	100	100	100	100	100	100%
99.75%

Novel outline

Handle questions about the outline of a novel in various formats

Scenario	#1	#2	#3	#4	#5	#6	#7	#8	#9	#10	Total
outline-count
Count acts ToolingUtility	100	100	100	100	100	100	100	100	100	100	100%
Count chapters ToolingUtility	100	100	100	100	100	100	100	100	100	100	100%
Count scenes ToolingUtility	100	100	100	100	100	100	100	100	100	100	100%
outline-count											100.00%
pov-count
Count point of views for Jack and Olivia ToolingUtility	100	100	100	100	100	100	100	100	100	100	100%
Count point of views for Jack Harper ToolingUtility	100	100	100	100	100	100	100	100	100	100	100%
Count point of views for Olivia ToolingUtility	100	100	100	100	100	100	100	100	100	100	100%
pov-count											100.00%
100.00%

Text Replacement

Tests deterministic text transformations: renaming characters/locations, expanding contractions, tense rewriting, POV shifts, gender swaps, combined transformations, and word avoidance. Scored by checking each expected change independently.

Scenario	#1	#2	#3	#4	#5	#6	#7	Total
Generic Prompt
Avoid said/asked/replied/answered Rule followingLanguage	100	100	100	100	100	100	100	100%
Character rename: Elena->Mirabel, Gregor->Aldric Rule followingLanguage	100	100	100	100	100	100	100	100%
Combined: 3rd person past → 1st person present Rule followingLanguage	99	99	99	99	99	99	99	99%
Expand all contractions Rule followingLanguage	100	100	100	100	100	100	100	100%
Location rename: market square, outer ring, bridge, northern mines Rule followingLanguage	100	100	100	100	100	100	100	100%
Multi-character gender swap: Priya(F)->Rohan(M), Mara unchanged Rule followingLanguage	100	100	100	100	100	100	100	100%
Passive voice → active voice Rule followingLanguageLogic	98	97	97	96	96	95	95	96%
POV shift: 3rd person to 1st person (Elena's perspective) Rule followingLanguage	99	99	99	99	99	99	99	99%
Tense rewriting: past to present Rule followingLanguage	100	100	100	100	100	99	99	100%
Generic Prompt								99.34%
Specific Prompt
Avoid said/asked/replied/answered Rule followingLanguage	100	100	100	100	100	100	100	100%
Character rename: Elena->Mirabel, Gregor->Aldric Rule followingLanguage	100	100	100	100	100	100	100	100%
Combined: 3rd person past → 1st person present Rule followingLanguage	100	100	100	100	100	100	100	100%
Expand all contractions Rule followingLanguage	100	100	100	100	100	100	100	100%
Location rename: market square, outer ring, bridge, northern mines Rule followingLanguage	100	100	100	100	100	100	100	100%
Multi-character gender swap: Priya(F)->Rohan(M), Mara unchanged Rule followingLanguage	100	100	100	100	100	100	100	100%
Passive voice → active voice Rule followingLanguageLogic	100	100	99	99	98	98	98	99%
POV shift: 3rd person to 1st person (Elena's perspective) Rule followingLanguage	100	100	100	100	100	100	100	100%
Tense rewriting: past to present Rule followingLanguage	100	100	100	100	100	100	100	100%
Specific Prompt								99.86%
99.60%

Tool usage within Novelcrafter

Output messages that are related to tool usage within Novelcrafter

Scenario	#1	#2	#3	#4	#5	#6	#7	#8	#9	#10	Total
Create alternate prose sections ToolingUtility	100	100	100	100	100	100	100	100	100	100	100%
100.00%

Voice/dialogue sheets

Extract dialogue from given text as voice sheets.

Scenario	#1	#2	#3	#4	#5	#6	#7	#8	#9	#10	Total
Multiple speakers Utility	100	100	100	100	100	100	100	100	100	100	100%
Simple Utility	100	100	100	100	100	100	100	100	100	100	100%
Simple (1-shot) 1-shot Utility	100	100	100	100	100	100	100	100	100	100	100%
Simple (5-shot) Few-shot Utility	100	100	100	100	100	100	100	100	100	100	100%
Unattributed dialogue Utility	100	100	100	100	100	100	100	100	100	100	100%
100.00%

Write N of X

Write exactly N words/sentences/paragraphs...

Scenario	#1	#2	#3	#4	#5	#6	#7	#8	#9	#10	Total
paragraphs
1 paragraph summary Rule following	100	100	100	100	100	100	100	100	100	100	100%
3 paragraph summary Rule following	100	100	100	100	100	100	100	100	100	100	100%
5 paragraph summary Rule following	100	100	100	100	100	100	100	100	100	100	100%
paragraphs											100.00%
sentences
1 sentence summary Rule following	100	100	100	100	100	100	100	100	100	100	100%
3 sentence summary Rule following	100	100	100	100	100	100	100	100	100	100	100%
10 sentence summary Rule following	100	100	100	100	100	100	100	100	100	100	100%
20 sentence summary Rule following	100	100	100	100	100	100	100	100	100	100	100%
50 sentence summary Rule following	100	100	100	100	100	100	100	100	100	100	100%
sentences											100.00%
words
10 word summary Rule following	100	100	100	100	100	100	100	100	100	100	100%
20 word summary Rule following	100	100	100	100	100	100	100	100	100	100	100%
50 word summary Rule following	100	100	100	100	100	100	100	100	100	100	100%
100 word summary Rule following	100	100	100	100	100	100	100	100	100	100	100%
200 word summary Rule following	100	100	100	100	100	100	100	100	100	100	100%
words											99.99%
100.00%