Claude Haiku 5.5 (Adaptive)

anthropic/claude-haiku-5.5

Claude Haiku 5.5 (Adaptive)

via OpenRouter

Release Date

Oct 7th, 2026

Context Size

Reasoning

Yes

Benchmark Cost

$0.92

Speed

181.5 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	93	93	92	91	91	92%
Horror: alone in an eerie place at night Creative Writing Hallucination	96	94	93	92	91	93%
Literary fiction: old friends reunite Creative Writing Hallucination	88	86	83	83	82	84%
Mystery: examining a crime scene Creative Writing Hallucination	93	92	91	91	85	91%
Romance: separated couple reunites Creative Writing Hallucination	92	91	87	87	83	88%
Thriller: chase through city streets Creative Writing Hallucination	94	92	92	91	88	91%
Detailed Writing Rules						89.87%
genre
Fantasy: entering an ancient ruin Creative Writing Hallucination	86	83	83	82	79	82%
Horror: alone in an eerie place at night Creative Writing Hallucination	92	90	87	84	83	87%
Literary fiction: old friends reunite Creative Writing Hallucination	90	89	89	87	82	87%
Mystery: examining a crime scene Creative Writing Hallucination	91	88	87	81	79	85%
Romance: separated couple reunites Creative Writing Hallucination	88	83	83	81	77	83%
Thriller: chase through city streets Creative Writing Hallucination	93	92	86	79	79	86%
genre						85.06%
Novelcrafter Default Prompt
Fantasy: entering an ancient ruin Creative Writing Hallucination	92	90	88	86	85	88%
Horror: alone in an eerie place at night Creative Writing Hallucination	91	87	87	85	83	87%
Literary fiction: old friends reunite Creative Writing Hallucination	89	88	87	85	85	87%
Mystery: examining a crime scene Creative Writing Hallucination	90	89	86	86	84	87%
Romance: separated couple reunites Creative Writing Hallucination	90	89	87	86	84	87%
Thriller: chase through city streets Creative Writing Hallucination	95	89	86	85	85	88%
Novelcrafter Default Prompt						87.30%
87.41%

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	97	97	97	96	97%
Medium: The Hollow (Inferred) Tooling Reasoning	98	97	97	95	92	96%
Medium: Through the Thornveil (Scattered) Tooling Reasoning	98	97	97	96	95	97%
Short: The Rusty Lantern (Explicit) Tooling Reasoning	99	98	98	95	90	96%
96.31%

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	100	100	100	100	100	100	100	100	100	100	100%
Long text (~1594 words), small codex (11 entries) Hallucination	100	100	100	100	100	100	100	100	100	100	100%
Short text (~524 words), big codex (51 entries) Hallucination	100	100	100	100	100	100	100	100	100	100	100%
Short text (~524 words), small codex (11 entries) Hallucination	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) Hallucination	100	100	100	100	100	100	100	100	100	25	93%
Long text (~1594 words), small codex (11 detailed entries) Hallucination	100	100	100	100	100	100	100	100	100	100	100%
Short text (~524 words), big codex (51 detailed entries) Hallucination	100	100	100	100	100	100	100	100	100	100	100%
Short text (~524 words), small codex (11 detailed entries) Hallucination	100	100	100	100	100	100	100	100	100	25	93%
detailed entries											96.25%
98.13%

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	98	96	95	93	93	93	92	90	90	87	93%
Large codex (40 entries), short passage (165 words) Tooling Reasoning	96	96	94	92	90	89	89	87	87	85	91%
Small codex (7 entries), long passage (734 words) Tooling Reasoning	100	100	100	100	100	100	97	97	97	97	99%
Small codex (7 entries), short passage (165 words) Tooling Reasoning	100	100	100	100	100	100	100	97	97	88	98%
matrix											95.04%
tiers
5 codex entries Tooling Reasoning	100	100	100	100	100	93	83	83	83	75	92%
10 codex entries Tooling Reasoning	100	100	100	100	100	86	86	86	86	86	93%
20 codex entries Tooling Reasoning	94	94	91	89	89	89	86	85	81	81	88%
40 codex entries Tooling Reasoning	100	100	100	100	95	92	91	83	79	75	92%
tiers											91.09%
93.07%

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%
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%
95.45%

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	100	99	98	97	97	91	57	53	50	11	75%
Write 200 words with 50% dialogue Rule Following Utility	100	87	84	80	79	74	64	58	45	5	67%
Write 200 words with 90% dialogue Rule Following Utility	50	47	42	41	40	39	19	18	18	18	33%
dialogue-200											58.65%
dialogue-500
Write 500 words with 30% dialogue Rule Following Utility	49	49	5	2	0	0	0	0	0	0	11%
Write 500 words with 50% dialogue Rule Following Utility	63	58	48	41	36	35	19	0	0	0	30%
Write 500 words with 70% dialogue Rule Following Utility	50	50	46	45	33	21	2	0	0	0	25%
dialogue-500											21.84%
Ungrouped
Write unattributed dialogue Rule Following	100	100	100	100	100	61	61	61	14	14	71%
44.62%

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	100	100	100	96	99%
Character dialogue (Italian) in a story Language	100	100	100	100	100	100%
Character dialogue (Spanish) in a story Language	100	100	100	97	96	99%
99.54%

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	100	100%
Write sentences with 10 words each Utility	100	100	100	100	100	100	100	100	100	92	99%
Write sentences with 20 words each Utility	100	100	100	100	100	100	100	100	100	94	99%
99.53%

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	100	100	100	100	100	100	100%
outline-count											100.00%
pov-count
Count point of views for Jack and Olivia Utility	100	100	100	100	100	100	100	100	100	50	95%
Count point of views for Jack Harper Utility	100	100	100	100	100	100	100	100	100	100	100%
Count point of views for Olivia Utility	100	100	100	100	100	100	100	100	100	100	100%
pov-count											98.33%
99.17%

Relationship tree

Extracts a deterministic XML family and relationship tree from cumulative literary prose.

Scenario	#1	#2	#3	#4	#5	Total
Core relationship tree Tooling Reasoning Hallucination	97	95	91	87	86	91%
Family relationship tree Tooling Reasoning Hallucination	87	85	83	83	80	84%
87.50%

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	98	98	98	95	99%
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	99	100%
Passive voice → active voice Text Editing Hallucination	94	94	92	92	84	84	82	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								98.38%
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	99	99	98	100%
Location rename: market square, outer ring, bridge, northern mines Text Editing	100	100	100	100	100	100	63	95%
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	99	99	98	98	98	98	97	98%
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%
98.75%

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	0	0	0	0	0	0	0	0	0	10%
Simple (1-shot) 1-shot Rule Following	100	100	100	100	100	100	100	100	0	0	80%
Simple (5-shot) Few-shot Rule Following	100	100	100	100	100	100	100	100	0	0	80%
Unattributed dialogue Rule Following	100	100	100	100	0	0	0	0	0	0	40%
42.00%

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	0	0	0	70%
paragraphs											90.00%
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	98	98	92	99%
50 sentence summary Utility	100	100	100	100	100	100	100	100	100	100	100%
sentences											99.77%
words
10 word summary Utility	100	100	100	100	92	92	0	0	0	0	58%
20 word summary Utility	100	100	100	100	100	100	100	100	100	98	100%
50 word summary Utility	100	100	100	100	100	100	100	100	100	100	100%
100 word summary Utility	100	100	100	100	100	100	100	100	100	100	100%
200 word summary Utility	100	100	100	100	100	100	100	100	100	100	100%
words											91.65%
94.39%