Claude Sonnet 4.6 (Reasoning)

anthropic/claude-sonnet-4.6

Claude Sonnet 4.6 (Reasoning)

via OpenRouter

Release Date

Feb 17th, 2026

Context Size

Benchmark Cost

$43.81

Speed

69.8 tok/s

Creative writing

79.98%

Rule following

91.28%

Utility

91.14%

Mathematics

100.00%

Tooling

92.20%

Language

98.79%

Logic

87.50%

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	91	87	86	85	84	87%
Horror: alone in an eerie place at night Creative writingRule following	95	92	90	88	87	90%
Literary fiction: old friends reunite Creative writingRule following	86	86	85	84	83	85%
Mystery: examining a crime scene Creative writingRule following	93	89	86	84	83	87%
Romance: separated couple reunites Creative writingRule following	89	89	88	88	80	87%
Thriller: chase through city streets Creative writingRule following	93	92	91	90	86	90%
Detailed Writing Rules						87.64%
genre
Fantasy: entering an ancient ruin Creative writingRule following	80	78	77	74	74	76%
Horror: alone in an eerie place at night Creative writingRule following	88	85	84	81	78	83%
Literary fiction: old friends reunite Creative writingRule following	85	78	74	71	71	76%
Mystery: examining a crime scene Creative writingRule following	81	77	77	74	67	75%
Romance: separated couple reunites Creative writingRule following	80	77	76	76	74	77%
Thriller: chase through city streets Creative writingRule following	83	82	80	79	70	79%
genre						77.68%
Novelcrafter Default Prompt
Fantasy: entering an ancient ruin Creative writingRule following	84	83	80	78	78	81%
Horror: alone in an eerie place at night Creative writingRule following	90	87	82	82	78	84%
Literary fiction: old friends reunite Creative writingRule following	85	82	80	77	75	80%
Mystery: examining a crime scene Creative writingRule following	85	85	84	81	80	83%
Romance: separated couple reunites Creative writingRule following	83	80	79	77	75	79%
Thriller: chase through city streets Creative writingRule following	87	78	77	75	73	78%
Novelcrafter Default Prompt						80.72%
82.01%

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	98	98	97	97	97	97%
Medium: The Hollow (Inferred) UtilityRule following	98	98	98	97	97	97%
Medium: Through the Thornveil (Scattered) UtilityRule following	98	98	98	97	97	98%
Short: The Rusty Lantern (Explicit) UtilityRule following	100	98	96	96	95	97%
97.39%

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	17	17	83%
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	25	25	85%
basic entries											92.08%
detailed entries
Long text (~1594 words), big codex (51 detailed entries) ToolingUtilityLogicRule following	100	100	100	100	100	100	100	100	100	25	93%
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	25	25	25	25	25	25	25	17	39%
Short text (~524 words), small codex (11 detailed entries) ToolingUtilityLogicRule following	100	100	100	100	25	25	25	25	25	25	55%
detailed entries											71.67%
81.88%

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	99	98	98	98	98	97	97	96	96	94	97%
Large codex (40 entries), short passage (165 words) ToolingUtilityLogicRule following	100	97	97	97	97	97	97	96	96	96	97%
Small codex (7 entries), long passage (734 words) ToolingUtilityLogicRule following	100	100	100	100	100	100	97	83	83	83	95%
Small codex (7 entries), short passage (165 words) ToolingUtilityLogicRule following	100	100	100	100	100	100	100	100	100	100	100%
matrix											97.27%
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	86	86	86	86	86	93%
20 codex entries ToolingUtilityLogicRule following	96	96	96	96	96	92	92	92	92	88	93%
40 codex entries ToolingUtilityLogicRule following	100	100	100	100	100	100	100	100	100	100	100%
tiers											96.62%
96.95%

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	91	99%
Write 200 words with 50% dialogue Creative writingRule following	100	100	100	100	100	99	99	99	97	93	99%
Write 200 words with 90% dialogue Creative writingRule following	100	97	90	75	72	63	60	56	53	50	72%
dialogue-200											89.72%
dialogue-500
Write 500 words with 30% dialogue Creative writingRule following	100	98	98	97	95	92	86	59	53	42	82%
Write 500 words with 50% dialogue Creative writingRule following	96	73	60	55	50	46	39	31	30	26	50%
Write 500 words with 70% dialogue Creative writingRule following	54	46	39	35	22	22	18	18	3	1	26%
dialogue-500											52.68%
Ungrouped
Write unattributed dialogue Creative writingRule following	100	100	100	100	100	100	100	100	100	61	96%
74.75%

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	96	99%
Character dialogue (German) in a story Language	100	100	100	100	95	99%
Character dialogue (Hindi) in a story Language	100	100	100	50	47	79%
Character dialogue (Italian) in a story Language	100	100	100	100	95	99%
Character dialogue (Spanish) in a story Language	100	100	100	100	96	99%
95.15%

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	100	100	100%
Write sentences with 20 words each Rule following	100	100	100	100	100	100	100	100	100	100	100%
100.00%

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	0	90%
outline-count											96.67%
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%
98.33%

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	100	99	99	99	99	99	99	99%
Expand all contractions Rule followingLanguage	100	100	99	99	99	99	99	99%
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	97	96	96	96	95	95	94	96%
POV shift: 3rd person to 1st person (Elena's perspective) Rule followingLanguage	100	100	100	100	100	100	99	100%
Tense rewriting: past to present Rule followingLanguage	100	100	100	100	99	97	97	99%
Generic Prompt								99.22%
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	99	99	98	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								99.85%
99.54%

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	0	90%
Simple (5-shot) Few-shot Utility	100	100	100	100	100	100	0	0	0	0	60%
Unattributed dialogue Utility	100	100	100	100	100	100	100	100	100	100	100%
90.00%

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	98	100%
sentences											99.96%
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%
99.98%