Claude 3.5 Sonnet

anthropic/claude-3.5-sonnet

Claude 3.5 Sonnet

via OpenRouter

Release Date

Jun 20th, 2024

Context Size

200k

Reasoning

Benchmark Cost

$28.78

Speed

431.2 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	79	78	77	72	71	75%
Horror: alone in an eerie place at night Creative Writing Hallucination	92	83	82	82	80	84%
Literary fiction: old friends reunite Creative Writing Hallucination	88	85	85	83	81	84%
Mystery: examining a crime scene Creative Writing Hallucination	90	85	82	79	72	82%
Romance: separated couple reunites Creative Writing Hallucination	91	85	85	85	81	86%
Thriller: chase through city streets Creative Writing Hallucination	88	86	83	83	79	84%
Detailed Writing Rules						82.39%
genre
Fantasy: entering an ancient ruin Creative Writing Hallucination	73	73	71	64	64	69%
Horror: alone in an eerie place at night Creative Writing Hallucination	76	75	74	74	71	74%
Literary fiction: old friends reunite Creative Writing Hallucination	83	81	81	77	76	80%
Mystery: examining a crime scene Creative Writing Hallucination	81	80	78	77	76	78%
Romance: separated couple reunites Creative Writing Hallucination	86	83	82	78	77	81%
Thriller: chase through city streets Creative Writing Hallucination	83	79	74	74	73	76%
genre						76.46%
Novelcrafter Default Prompt
Fantasy: entering an ancient ruin Creative Writing Hallucination	80	72	66	61	59	68%
Horror: alone in an eerie place at night Creative Writing Hallucination	80	74	71	69	67	72%
Literary fiction: old friends reunite Creative Writing Hallucination	79	79	78	76	74	77%
Mystery: examining a crime scene Creative Writing Hallucination	85	80	77	76	71	78%
Romance: separated couple reunites Creative Writing Hallucination	87	85	83	80	77	82%
Thriller: chase through city streets Creative Writing Hallucination	82	81	79	79	72	79%
Novelcrafter Default Prompt						75.85%
78.24%

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	96	96	96	94	93	95%
Medium: The Hollow (Inferred) Tooling Reasoning	96	96	96	96	96	96%
Medium: Through the Thornveil (Scattered) Tooling Reasoning	97	97	97	97	96	97%
Short: The Rusty Lantern (Explicit) Tooling Reasoning	95	94	94	94	94	94%
95.57%

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	35	17	17	13	10	10	10	10	8	7	14%
Long text (~1594 words), small codex (11 entries) Hallucination	25	17	17	17	17	17	17	13	13	13	16%
Short text (~524 words), big codex (51 entries) Hallucination	100	100	100	100	25	25	25	17	17	13	52%
Short text (~524 words), small codex (11 entries) Hallucination	100	100	100	42	38	25	17	13	13	10	46%
basic entries											31.89%
detailed entries
Long text (~1594 words), big codex (51 detailed entries) Hallucination	10	8	8	8	8	8	7	7	7	7	8%
Long text (~1594 words), small codex (11 detailed entries) Hallucination	17	17	17	13	13	13	13	13	13	10	14%
Short text (~524 words), big codex (51 detailed entries) Hallucination	100	100	50	50	42	17	17	13	13	10	41%
Short text (~524 words), small codex (11 detailed entries) Hallucination	100	100	100	25	17	17	17	17	13	10	41%
detailed entries											25.99%
28.94%

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	79	78	78	77	76	74	74	74	72	68	75%
Large codex (40 entries), short passage (165 words) Tooling Reasoning	92	92	92	92	87	87	87	83	83	81	88%
Small codex (7 entries), long passage (734 words) Tooling Reasoning	93	90	90	90	90	90	88	84	84	84	88%
Small codex (7 entries), short passage (165 words) Tooling Reasoning	100	100	100	100	100	100	100	100	92	92	98%
matrix											87.33%
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	100	100	94	94	99%
20 codex entries Tooling Reasoning	97	96	96	96	96	96	92	89	88	85	93%
40 codex entries Tooling Reasoning	97	93	88	88	88	88	88	84	84	84	88%
tiers											95.04%
91.18%

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	97	71	50	43	43	41	38	5	3	0	39%
Write 200 words with 50% dialogue Rule Following Utility	46	40	34	27	26	18	15	1	0	0	21%
Write 200 words with 90% dialogue Rule Following Utility	92	91	65	56	56	44	32	32	19	18	51%
dialogue-200											36.80%
dialogue-500
Write 500 words with 30% dialogue Rule Following Utility	34	1	1	1	0	0	0	0	0	0	4%
Write 500 words with 50% dialogue Rule Following Utility	31	20	4	3	1	1	0	0	0	0	6%
Write 500 words with 70% dialogue Rule Following Utility	98	93	85	50	46	44	41	3	3	0	46%
dialogue-500											18.65%
Ungrouped
Write unattributed dialogue Rule Following	100	100	100	100	100	100	100	100	100	100	100%
38.05%

Language Comprehension

Does the model understand more than just English?

Scenario	#1	#2	#3	#4	#5	Total
Asking for directions (Dutch) Language	100	0	0	0	0	20%
Asking for directions (German) Language	100	100	100	100	100	100%
Friend got new kittens (German) Language	100	100	100	100	0	80%
Friend got new kittens (Tagalog) Language	100	100	100	100	100	100%
75.00%

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	95	94	98%
Character dialogue (Hindi) in a story Language	100	100	100	94	50	89%
Character dialogue (Italian) in a story Language	100	100	100	92	87	96%
Character dialogue (Spanish) in a story Language	100	100	100	100	94	99%
96.24%

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	96	93	87	98%
Write sentences with 10 words each Utility	100	100	97	95	92	92	90	86	83	78	91%
Write sentences with 20 words each Utility	51	47	45	40	19	16	13	13	6	1	25%
71.31%

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	100	0	0	0	0	0	0	40%
outline-count											80.00%
pov-count
Count point of views for Jack and Olivia Utility	50	50	0	0	0	0	0	0	0	0	10%
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	0	0	0	0	0	0	0	0	0	0	0%
pov-count											30.00%
55.00%

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	91	89	89	88	88	88	88	89%
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								98.54%
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	95	94	94	94	94	94	94	94%
POV shift: 3rd person to 1st person (Elena's perspective) Text Editing	100	100	100	100	100	100	97	100%
Tense rewriting: past to present Text Editing	100	100	100	100	100	100	100	100%
Specific Prompt								99.16%
98.85%

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	0	0	0	0	0	0	0	0	0	0	0%
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%
80.00%

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	100	100	100	100	100	100	100	100	100	100	100%
5 paragraph summary Utility	100	100	100	100	100	100	100	100	100	100	100%
paragraphs											100.00%
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	100	100	100	100	100	100	100	100	100	100	100%
20 sentence summary Utility	100	100	100	100	100	100	100	27	27	9	76%
50 sentence summary Utility	100	100	100	100	100	100	100	100	100	0	90%
sentences											93.24%
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	98	98	98	92	99%
50 word summary Utility	100	100	98	92	77	54	54	27	27	9	64%
100 word summary Utility	100	98	92	77	54	54	27	9	0	0	51%
200 word summary Utility	0	0	0	0	0	0	0	0	0	0	0%
words											62.74%
83.07%