Claude 3.7 Sonnet

anthropic/claude-3.7-sonnet

Claude 3.7 Sonnet

via OpenRouter

Release Date

Feb 19th, 2025

Context Size

200k

Reasoning

Benchmark Cost

$18.20

Speed

87.2 tok/s

Subcategories

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 Writing Hallucination	73	71	71	69	61	69%
Horror: alone in an eerie place at night Creative Writing Hallucination	81	79	78	74	72	77%
Literary fiction: old friends reunite Creative Writing Hallucination	86	82	81	75	74	80%
Mystery: examining a crime scene Creative Writing Hallucination	82	82	79	77	77	80%
Romance: separated couple reunites Creative Writing Hallucination	82	81	80	77	76	79%
Thriller: chase through city streets Creative Writing Hallucination	82	82	77	75	74	78%
Detailed Writing Rules						77.02%
genre
Fantasy: entering an ancient ruin Creative Writing Hallucination	75	74	73	73	66	72%
Horror: alone in an eerie place at night Creative Writing Hallucination	77	74	73	72	72	74%
Literary fiction: old friends reunite Creative Writing Hallucination	78	77	76	74	74	76%
Mystery: examining a crime scene Creative Writing Hallucination	83	79	79	78	72	78%
Romance: separated couple reunites Creative Writing Hallucination	85	79	78	77	76	79%
Thriller: chase through city streets Creative Writing Hallucination	78	78	77	77	71	76%
genre						75.83%
Novelcrafter Default Prompt
Fantasy: entering an ancient ruin Creative Writing Hallucination	74	74	71	70	68	71%
Horror: alone in an eerie place at night Creative Writing Hallucination	74	74	73	73	72	73%
Literary fiction: old friends reunite Creative Writing Hallucination	83	82	81	80	76	81%
Mystery: examining a crime scene Creative Writing Hallucination	87	80	79	76	73	79%
Romance: separated couple reunites Creative Writing Hallucination	83	82	81	79	78	81%
Thriller: chase through city streets Creative Writing Hallucination	81	78	73	73	71	75%
Novelcrafter Default Prompt						76.61%
76.49%

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) Tooling Reasoning	97	96	96	96	96	96%
Medium: The Hollow (Inferred) Tooling Reasoning	96	96	96	95	95	96%
Medium: Through the Thornveil (Scattered) Tooling Reasoning	97	97	96	96	95	96%
Short: The Rusty Lantern (Explicit) Tooling Reasoning	99	99	99	98	98	98%
96.56%

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) Hallucination	10	8	8	8	8	8	7	7	6	5	8%
Long text (~1594 words), small codex (11 entries) Hallucination	17	17	13	13	13	13	13	10	10	10	13%
Short text (~524 words), big codex (51 entries) Hallucination	100	100	42	17	17	17	17	17	17	17	36%
Short text (~524 words), small codex (11 entries) Hallucination	42	25	17	17	17	13	13	13	13	13	18%
basic entries											18.50%
detailed entries
Long text (~1594 words), big codex (51 detailed entries) Hallucination	100	35	13	10	10	10	10	8	7	7	21%
Long text (~1594 words), small codex (11 detailed entries) Hallucination	50	42	17	17	17	13	13	13	13	13	20%
Short text (~524 words), big codex (51 detailed entries) Hallucination	100	100	100	100	25	25	25	17	17	17	53%
Short text (~524 words), small codex (11 detailed entries) Hallucination	100	100	38	35	25	17	13	13	13	13	36%
detailed entries											32.59%
25.54%

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) Tooling Reasoning	84	82	79	79	76	73	73	73	68	66	75%
Large codex (40 entries), short passage (165 words) Tooling Reasoning	90	87	87	87	87	87	85	85	85	85	87%
Small codex (7 entries), long passage (734 words) Tooling Reasoning	97	97	93	88	88	88	88	88	84	84	89%
Small codex (7 entries), short passage (165 words) Tooling Reasoning	100	100	100	100	100	100	100	100	100	100	100%
matrix											87.85%
tiers
5 codex entries Tooling Reasoning	100	100	100	100	100	100	100	100	100	100	100%
10 codex entries Tooling Reasoning	100	100	100	100	100	100	92	3	3	3	70%
20 codex entries Tooling Reasoning	100	100	92	92	89	78	77	73	70	62	83%
40 codex entries Tooling Reasoning	97	97	97	97	97	97	97	97	88	88	95%
tiers											87.14%
87.50%

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 Reasoning	50	50	50	50	50	50	50	50	50	50	50%
Guess the pet Reasoning	100	100	100	100	100	100	100	100	100	100	100%
Highest-rated movie Reasoning	100	100	100	100	100	100	100	100	100	100	100%
Indirect birth year Reasoning	100	100	100	100	100	100	100	100	100	100	100%
What instrument does Lucy play? Reasoning	100	100	100	100	100	100	100	100	100	100	100%
What's the color of the car? Utility	100	100	100	100	100	100	100	100	100	100	100%
What's the correct time? Reasoning	0	0	0	0	0	0	0	0	0	0	0%
Who's the sister? Reasoning	100	100	100	100	100	100	100	100	100	100	100%
Who's the tallest? Reasoning	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 Rule Following Utility	41	34	22	22	14	7	5	3	1	1	15%
Write 200 words with 50% dialogue Rule Following Utility	41	30	22	18	14	10	3	2	1	0	14%
Write 200 words with 90% dialogue Rule Following Utility	95	84	64	60	60	59	52	52	50	50	63%
dialogue-200											30.50%
dialogue-500
Write 500 words with 30% dialogue Rule Following Utility	50	50	50	48	48	45	43	41	7	0	38%
Write 500 words with 50% dialogue Rule Following Utility	50	50	50	49	48	43	10	10	10	0	32%
Write 500 words with 70% dialogue Rule Following Utility	75	72	63	53	51	51	50	50	49	31	54%
dialogue-500											41.58%
Ungrouped
Write unattributed dialogue Rule Following	100	100	100	100	100	100	100	100	100	100	100%
45.17%

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	0	0	60%
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%
90.00%

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	94	94	98%
Character dialogue (German) in a story Language	100	100	100	100	95	99%
Character dialogue (Hindi) in a story Language	100	100	100	95	50	89%
Character dialogue (Italian) in a story Language	100	100	100	95	94	98%
Character dialogue (Spanish) in a story Language	100	100	100	94	86	96%
95.89%

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 Utility	100	100	100	100	100	100	100	100	100	78	98%
Write sentences with 10 words each Utility	100	96	95	94	94	93	93	93	91	81	93%
Write sentences with 20 words each Utility	59	53	52	47	47	45	45	27	24	2	40%
76.97%

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 Utility	100	100	100	100	100	100	100	100	100	100	100%
Count chapters Utility	100	100	100	100	100	100	100	100	100	100	100%
Count scenes Utility	100	100	100	0	0	0	0	0	0	0	30%
outline-count											76.67%
pov-count
Count point of views for Jack and Olivia Utility	100	50	50	0	0	0	0	0	0	0	20%
Count point of views for Jack Harper Utility	100	100	100	100	100	100	100	100	0	0	80%
Count point of views for Olivia Utility	100	100	100	100	100	100	0	0	0	0	60%
pov-count											53.33%
65.00%

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 Text Editing	100	100	100	100	100	100	100	100%
Character rename: Elena->Mirabel, Gregor->Aldric Text Editing	100	100	100	100	100	100	100	100%
Combined: 3rd person past → 1st person present Text Editing	99	99	99	99	99	99	99	99%
Expand all contractions Text Editing	100	100	100	100	100	100	100	100%
Location rename: market square, outer ring, bridge, northern mines Text Editing	100	100	100	100	100	100	100	100%
Multi-character gender swap: Priya(F)->Rohan(M), Mara unchanged Text Editing	100	100	100	100	100	100	100	100%
Passive voice → active voice Text Editing Hallucination	94	93	93	93	93	91	91	93%
POV shift: 3rd person to 1st person (Elena's perspective) Text Editing	100	100	100	100	100	100	100	100%
Tense rewriting: past to present Text Editing	99	99	99	99	99	99	99	99%
Generic Prompt								98.98%
Specific Prompt
Avoid said/asked/replied/answered Text Editing	100	100	100	100	100	100	100	100%
Character rename: Elena->Mirabel, Gregor->Aldric Text Editing	100	100	100	100	100	100	100	100%
Combined: 3rd person past → 1st person present Text Editing	99	99	99	99	99	99	99	99%
Expand all contractions Text Editing	100	100	100	100	100	100	100	100%
Location rename: market square, outer ring, bridge, northern mines Text Editing	100	100	100	100	100	100	100	100%
Multi-character gender swap: Priya(F)->Rohan(M), Mara unchanged Text Editing	100	100	100	100	100	100	100	100%
Passive voice → active voice Text Editing Hallucination	94	93	93	93	93	93	92	93%
POV shift: 3rd person to 1st person (Elena's perspective) Text Editing	100	100	100	100	100	100	100	100%
Tense rewriting: past to present Text Editing	100	100	100	100	100	100	100	100%
Specific Prompt								99.11%
99.05%

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 Tooling	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 Rule Following	100	100	100	100	100	100	100	100	100	100	100%
Simple Rule Following	100	100	100	100	100	100	100	100	100	100	100%
Simple (1-shot) 1-shot Rule Following	100	100	100	100	100	100	100	100	100	100	100%
Simple (5-shot) Few-shot Rule Following	100	100	100	100	100	100	100	100	100	100	100%
Unattributed dialogue Rule Following	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 Utility	100	100	100	100	100	100	100	100	100	100	100%
3 paragraph summary Utility	0	0	0	0	0	0	0	0	0	0	0%
5 paragraph summary Utility	0	0	0	0	0	0	0	0	0	0	0%
paragraphs											33.33%
sentences
1 sentence summary Utility	100	100	100	100	100	100	100	100	100	100	100%
3 sentence summary Utility	100	100	100	100	100	100	100	100	100	100	100%
10 sentence summary Utility	98	92	92	92	77	77	54	54	54	27	72%
20 sentence summary Utility	0	0	0	0	0	0	0	0	0	0	0%
50 sentence summary Utility	100	100	100	100	100	100	0	0	0	0	60%
sentences											66.35%
words
10 word summary Utility	100	100	100	100	100	100	100	100	100	100	100%
20 word summary Utility	100	100	100	100	100	100	100	98	98	98	99%
50 word summary Utility	98	98	98	92	92	92	54	27	27	9	69%
100 word summary Utility	100	100	100	100	100	98	92	77	54	9	83%
200 word summary Utility	0	0	0	0	0	0	0	0	0	0	0%
words											70.28%
60.24%