o4 Mini - NC Bench

openai/o4-mini

o4 Mini

via OpenRouter

Release Date

Apr 16th, 2025

Context Size

200k

Reasoning

Yes

Benchmark Cost

$13.16

Speed

106.2 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	81	80	79	78	76	79%
Horror: alone in an eerie place at night Creative Writing Hallucination	84	84	82	78	78	81%
Literary fiction: old friends reunite Creative Writing Hallucination	84	84	84	83	83	84%
Mystery: examining a crime scene Creative Writing Hallucination	87	85	84	83	82	84%
Romance: separated couple reunites Creative Writing Hallucination	90	83	82	81	81	83%
Thriller: chase through city streets Creative Writing Hallucination	86	85	81	79	77	82%
Detailed Writing Rules						82.11%
genre
Fantasy: entering an ancient ruin Creative Writing Hallucination	79	79	78	75	73	77%
Horror: alone in an eerie place at night Creative Writing Hallucination	81	75	74	73	69	74%
Literary fiction: old friends reunite Creative Writing Hallucination	84	83	83	81	76	81%
Mystery: examining a crime scene Creative Writing Hallucination	83	83	82	79	76	81%
Romance: separated couple reunites Creative Writing Hallucination	82	81	77	75	69	77%
Thriller: chase through city streets Creative Writing Hallucination	82	82	80	78	77	80%
genre						78.17%
Novelcrafter Default Prompt
Fantasy: entering an ancient ruin Creative Writing Hallucination	88	78	76	75	73	78%
Horror: alone in an eerie place at night Creative Writing Hallucination	83	79	78	76	74	78%
Literary fiction: old friends reunite Creative Writing Hallucination	87	84	81	81	80	83%
Mystery: examining a crime scene Creative Writing Hallucination	90	84	84	81	81	84%
Romance: separated couple reunites Creative Writing Hallucination	87	83	83	82	79	83%
Thriller: chase through city streets Creative Writing Hallucination	82	82	81	79	78	80%
Novelcrafter Default Prompt						80.94%
80.41%

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	96	94	92	95%
Medium: The Hollow (Inferred) Tooling Reasoning	96	96	96	94	92	95%
Medium: Through the Thornveil (Scattered) Tooling Reasoning	96	96	96	95	95	96%
Short: The Rusty Lantern (Explicit) Tooling Reasoning	99	98	96	92	90	95%
95.15%

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	25	25	85%
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											96.25%
detailed entries
Long text (~1594 words), big codex (51 detailed entries) Hallucination	100	100	100	100	100	100	100	100	100	100	100%
Long text (~1594 words), small codex (11 detailed entries) Hallucination	100	100	100	100	100	100	100	100	100	25	93%
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%
96.25%

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	96	94	94	94	93	92	92	91	90	89	92%
Large codex (40 entries), short passage (165 words) Tooling Reasoning	98	96	96	94	94	94	92	92	89	87	93%
Small codex (7 entries), long passage (734 words) Tooling Reasoning	97	97	97	97	97	97	93	92	92	92	95%
Small codex (7 entries), short passage (165 words) Tooling Reasoning	100	100	100	97	97	97	97	97	97	97	98%
matrix											94.56%
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	92	86	86	96%
20 codex entries Tooling Reasoning	97	94	94	94	94	94	89	89	89	85	92%
40 codex entries Tooling Reasoning	100	100	100	100	100	97	97	97	97	92	98%
tiers											96.36%
95.46%

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	100	100	100	100	100	100	100	100	100	100	100%
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	100	0	0	0	0	0	0	0	0	0	10%
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%
92.50%

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	100	100	100	100	100	100	100	100	100	66	97%
Write 200 words with 50% dialogue Rule Following Utility	100	100	100	100	100	99	94	93	50	50	89%
Write 200 words with 90% dialogue Rule Following Utility	100	96	82	60	55	50	40	34	24	14	55%
dialogue-200											80.25%
dialogue-500
Write 500 words with 30% dialogue Rule Following Utility	100	100	100	91	77	65	61	58	43	39	73%
Write 500 words with 50% dialogue Rule Following Utility	100	100	99	71	64	50	50	50	45	39	67%
Write 500 words with 70% dialogue Rule Following Utility	82	56	50	30	6	0	0	0	0	0	22%
dialogue-500											54.16%
Ungrouped
Write unattributed dialogue Rule Following	100	100	100	100	100	100	61	61	0	0	72%
67.91%

Language Comprehension

Does the model understand more than just English?

Scenario	#1	#2	#3	#4	#5	Total
Asking for directions (Dutch) Language	100	100	0	0	0	40%
Asking for directions (German) Language	100	100	100	100	100	100%
Friend got new kittens (German) Language	0	0	0	0	0	0%
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	100	100%
Character dialogue (Hindi) in a story Language	100	100	100	100	100	100%
Character dialogue (Italian) in a story Language	100	100	100	100	100	100%
Character dialogue (Spanish) in a story Language	100	100	100	100	100	100%
100.00%

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	100	100%
Write sentences with 20 words each Utility	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 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	50	0	85%
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											95.00%
97.50%

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	98	98	98	98	97	96	93	97%
Expand all contractions Text Editing	100	100	100	100	100	99	99	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	99	99	100%
Passive voice → active voice Text Editing Hallucination	91	81	80	78	77	49	47	72%
POV shift: 3rd person to 1st person (Elena's perspective) Text Editing	100	100	100	99	99	97	97	99%
Tense rewriting: past to present Text Editing	97	97	92	91	88	88	82	91%
Generic Prompt								95.30%
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	100	100	100	100	100	99	5	86%
Expand all contractions Text Editing	100	100	100	100	100	100	99	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	99	100%
Passive voice → active voice Text Editing Hallucination	99	99	98	98	98	97	96	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	96	90	98%
Specific Prompt								98.02%
96.66%

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	0	0	0	0	0	0	0	0	20%
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	0	0	80%
Unattributed dialogue Rule Following	100	100	100	100	100	100	100	100	100	100	100%
60.00%

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	98	100%
20 sentence summary Utility	100	100	100	100	100	100	100	100	100	100	100%
50 sentence summary Utility	100	100	100	100	100	100	100	100	92	27	92%
sentences											98.35%
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	100	100	100	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	98	98	92	92	92	97%
words											99.46%
99.16%