Thinking Machines Inkling

thinkingmachines/inkling

Thinking Machines Inkling

via OpenRouter

Release Date

Jul 18th, 2026

Context Size

Reasoning

Benchmark Cost

$3.91

Speed

68.3 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	78	78	78	73	73	76%
Horror: alone in an eerie place at night Creative Writing Hallucination	84	83	82	80	77	81%
Literary fiction: old friends reunite Creative Writing Hallucination	88	83	82	82	79	83%
Mystery: examining a crime scene Creative Writing Hallucination	82	81	81	79	77	80%
Romance: separated couple reunites Creative Writing Hallucination	86	84	83	83	79	83%
Thriller: chase through city streets Creative Writing Hallucination	88	86	82	80	73	82%
Detailed Writing Rules						80.73%
genre
Fantasy: entering an ancient ruin Creative Writing Hallucination	79	78	76	70	70	75%
Horror: alone in an eerie place at night Creative Writing Hallucination	88	81	81	78	77	81%
Literary fiction: old friends reunite Creative Writing Hallucination	81	79	75	73	72	76%
Mystery: examining a crime scene Creative Writing Hallucination	86	77	76	74	73	77%
Romance: separated couple reunites Creative Writing Hallucination	82	78	77	77	74	78%
Thriller: chase through city streets Creative Writing Hallucination	86	80	79	71	70	77%
genre						77.34%
Novelcrafter Default Prompt
Fantasy: entering an ancient ruin Creative Writing Hallucination	80	79	75	74	71	76%
Horror: alone in an eerie place at night Creative Writing Hallucination	90	84	82	77	74	81%
Literary fiction: old friends reunite Creative Writing Hallucination	89	88	88	84	78	85%
Mystery: examining a crime scene Creative Writing Hallucination	83	82	81	80	76	80%
Romance: separated couple reunites Creative Writing Hallucination	87	86	79	78	77	81%
Thriller: chase through city streets Creative Writing Hallucination	88	85	82	80	78	82%
Novelcrafter Default Prompt						81.07%
79.71%

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	96	94	96%
Medium: The Hollow (Inferred) Tooling Reasoning	97	97	96	95	94	96%
Medium: Through the Thornveil (Scattered) Tooling Reasoning	94	94	94	93	90	93%
Short: The Rusty Lantern (Explicit) Tooling Reasoning	99	98	94	94	92	95%
94.90%

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	50	50	38	29	27	26	13	13	13	1	26%
Long text (~1594 words), small codex (11 entries) Hallucination	50	50	50	50	50	50	42	42	38	38	46%
Short text (~524 words), big codex (51 entries) Hallucination	100	100	100	100	100	100	50	50	42	17	76%
Short text (~524 words), small codex (11 entries) Hallucination	100	100	100	100	100	100	100	42	30	25	80%
basic entries											56.80%
detailed entries
Long text (~1594 words), big codex (51 detailed entries) Hallucination	100	100	50	42	35	33	27	26	25	25	46%
Long text (~1594 words), small codex (11 detailed entries) Hallucination	100	100	100	50	50	35	33	31	25	25	55%
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	100	100%
detailed entries											75.32%
66.06%

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	77	70	68	67	60	43	40	33	33	3	49%
Large codex (40 entries), short passage (165 words) Tooling Reasoning	89	89	89	87	87	85	83	82	80	78	85%
Small codex (7 entries), long passage (734 words) Tooling Reasoning	83	79	79	79	76	76	76	76	72	57	75%
Small codex (7 entries), short passage (165 words) Tooling Reasoning	100	100	100	92	92	92	92	92	92	92	94%
matrix											75.91%
tiers
5 codex entries Tooling Reasoning	91	76	69	69	69	63	58	53	49	49	65%
10 codex entries Tooling Reasoning	100	100	92	92	92	92	86	86	86	74	90%
20 codex entries Tooling Reasoning	81	78	75	73	72	72	69	68	66	63	72%
40 codex entries Tooling Reasoning	95	92	91	87	87	84	83	76	70	69	83%
tiers											77.48%
76.70%

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	50	50	50	50	50	50	70%
Fruits excluding citrus Utility	100	100	100	100	100	100	100	100	100	100	100%
Future event time Reasoning	100	100	100	50	50	50	50	50	50	50	65%
Guess the pet Reasoning	100	100	100	100	100	50	50	50	50	50	75%
Highest-rated movie Reasoning	100	100	100	50	50	50	50	50	50	50	65%
Indirect birth year Reasoning	100	100	100	50	50	50	50	50	50	50	65%
What instrument does Lucy play? Reasoning	100	100	100	100	100	100	50	50	50	50	80%
What's the color of the car? Utility	100	100	100	50	50	50	50	50	50	50	65%
Who's the sister? Reasoning	100	100	100	100	50	50	50	50	50	50	70%
Who's the tallest? Reasoning	100	100	100	100	50	50	50	50	50	50	70%
75.00%

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	75	43	26	7	5	1	0	0	0	26%
Write 200 words with 50% dialogue Rule Following Utility	41	7	1	0	0	0	0	0	0	0	5%
Write 200 words with 90% dialogue Rule Following Utility	68	67	65	64	47	44	18	18	18	0	41%
dialogue-200											23.80%
dialogue-500
Write 500 words with 30% dialogue Rule Following Utility	50	14	1	0	0	0	0	0	0	0	6%
Write 500 words with 50% dialogue Rule Following Utility	14	12	0	0	0	0	0	0	0	0	3%
Write 500 words with 70% dialogue Rule Following Utility	3	2	0	0	0	0	0	0	0	0	1%
dialogue-500											3.17%
Ungrouped
Write unattributed dialogue Rule Following	100	100	100	100	100	100	100	61	61	0	82%
23.29%

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	0	80%
Asking for directions (German) Language	0	0	0	0	0	0%
Friend got new kittens (German) Language	100	100	100	0	0	60%
Friend got new kittens (Tagalog) Language	100	100	100	100	100	100%
60.00%

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	88	98%
Character dialogue (Hindi) in a story Language	100	100	52	50	46	70%
Character dialogue (Italian) in a story Language	100	100	100	100	89	98%
Character dialogue (Spanish) in a story Language	100	100	100	100	100	100%
92.99%

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	93	93	99%
Write sentences with 10 words each Utility	79	41	30	30	13	9	8	7	7	7	23%
Write sentences with 20 words each Utility	0	0	0	0	0	0	0	0	0	0	0%
40.54%

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	100	100	100	50	50	50	50	0	0	60%
Count point of views for Jack Harper Utility	100	100	100	100	0	0	0	0	0	0	40%
Count point of views for Olivia Utility	100	100	100	100	100	100	100	100	100	0	90%
pov-count											63.33%
70.00%

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	78	75	72	70	67	72%
Family relationship tree Tooling Reasoning Hallucination	75	70	65	63	60	66%
69.44%

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	67	67	67	86%
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	100	100	99	99	99	99	98	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	96	96	99%
Multi-character gender swap: Priya(F)->Rohan(M), Mara unchanged Text Editing	100	100	100	100	100	100	74	96%
Passive voice → active voice Text Editing Hallucination	95	95	95	95	92	91	88	93%
POV shift: 3rd person to 1st person (Elena's perspective) Text Editing	100	100	100	100	97	97	94	98%
Tense rewriting: past to present Text Editing	88	88	88	81	81	81	81	84%
Generic Prompt								95.06%
Specific Prompt
Avoid said/asked/replied/answered Text Editing	100	100	100	100	100	100	67	95%
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	100	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	96	96	95	95	95	95	94	95%
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								98.87%
96.97%

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	67	0	0	0	0	0	0	0	0	17%
16.67%

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	0	0	80%
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	0	90%
Simple (5-shot) Few-shot Rule Following	100	100	100	100	100	100	100	100	100	0	90%
Unattributed dialogue Rule Following	100	100	100	100	100	100	100	100	100	100	100%
92.00%

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	0	90%
5 paragraph summary Utility	100	0	0	0	0	0	0	0	0	0	10%
paragraphs											66.67%
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	98	100%
10 sentence summary Utility	100	100	98	92	92	27	27	9	0	0	55%
20 sentence summary Utility	100	100	100	100	100	100	100	98	54	0	85%
50 sentence summary Utility	92	0	0	0	0	0	0	0	0	0	9%
sentences											69.78%
words
10 word summary Utility	100	100	100	100	100	98	98	98	98	9	90%
20 word summary Utility	92	54	9	0	0	0	0	0	0	0	16%
50 word summary Utility	77	2	0	0	0	0	0	0	0	0	8%
100 word summary Utility	27	9	0	0	0	0	0	0	0	0	4%
200 word summary Utility	77	0	0	0	0	0	0	0	0	0	8%
words											25.01%
51.84%