GPT-5.4 Mini - NC Bench

openai/gpt-5.4-mini

GPT-5.4 Mini

via OpenRouter

Release Date

Mar 17th, 2026

Context Size

400k

Reasoning

Benchmark Cost

$2.77

Speed

145.8 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	90	89	87	84	81	86%
Horror: alone in an eerie place at night Creative Writing Hallucination	90	89	87	85	80	86%
Literary fiction: old friends reunite Creative Writing Hallucination	91	88	87	86	86	88%
Mystery: examining a crime scene Creative Writing Hallucination	91	90	89	89	88	89%
Romance: separated couple reunites Creative Writing Hallucination	91	89	88	88	87	89%
Thriller: chase through city streets Creative Writing Hallucination	90	88	88	88	88	88%
Detailed Writing Rules						87.70%
genre
Fantasy: entering an ancient ruin Creative Writing Hallucination	86	85	83	83	80	83%
Horror: alone in an eerie place at night Creative Writing Hallucination	89	88	85	85	84	86%
Literary fiction: old friends reunite Creative Writing Hallucination	90	89	89	86	85	88%
Mystery: examining a crime scene Creative Writing Hallucination	95	90	87	86	85	89%
Romance: separated couple reunites Creative Writing Hallucination	91	89	88	86	85	88%
Thriller: chase through city streets Creative Writing Hallucination	92	90	89	88	86	89%
genre						87.12%
Novelcrafter Default Prompt
Fantasy: entering an ancient ruin Creative Writing Hallucination	88	87	86	86	82	86%
Horror: alone in an eerie place at night Creative Writing Hallucination	87	87	86	83	82	85%
Literary fiction: old friends reunite Creative Writing Hallucination	88	88	87	86	84	87%
Mystery: examining a crime scene Creative Writing Hallucination	88	87	87	86	84	87%
Romance: separated couple reunites Creative Writing Hallucination	91	90	90	89	88	90%
Thriller: chase through city streets Creative Writing Hallucination	90	87	86	85	84	87%
Novelcrafter Default Prompt						86.74%
87.19%

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	93	93	93	92	92	93%
Medium: The Hollow (Inferred) Tooling Reasoning	95	95	94	93	92	94%
Medium: Through the Thornveil (Scattered) Tooling Reasoning	96	91	90	89	86	91%
Short: The Rusty Lantern (Explicit) Tooling Reasoning	98	93	93	92	91	93%
92.51%

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	25	25	25	25	25	25	25	17	17	31%
Long text (~1594 words), small codex (11 entries) Hallucination	100	25	25	25	25	25	25	25	17	13	30%
Short text (~524 words), big codex (51 entries) Hallucination	100	25	25	25	25	25	25	25	25	25	33%
Short text (~524 words), small codex (11 entries) Hallucination	100	100	25	25	25	25	25	25	25	17	39%
basic entries											33.23%
detailed entries
Long text (~1594 words), big codex (51 detailed entries) Hallucination	100	100	25	25	25	25	25	25	17	13	38%
Long text (~1594 words), small codex (11 detailed entries) Hallucination	25	25	25	25	25	25	25	25	17	17	23%
Short text (~524 words), big codex (51 detailed entries) Hallucination	100	100	100	100	25	25	25	25	25	25	55%
Short text (~524 words), small codex (11 detailed entries) Hallucination	100	25	25	25	25	25	25	25	25	25	33%
detailed entries											37.19%
35.21%

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	71	66	66	66	66	64	63	58	57	57	64%
Large codex (40 entries), short passage (165 words) Tooling Reasoning	94	89	89	87	85	83	80	33	33	33	71%
Small codex (7 entries), long passage (734 words) Tooling Reasoning	84	79	76	76	75	75	75	75	68	43	73%
Small codex (7 entries), short passage (165 words) Tooling Reasoning	97	93	92	88	88	88	88	84	84	70	87%
matrix											73.54%
tiers
5 codex entries Tooling Reasoning	91	83	83	76	76	76	76	67	67	50	74%
10 codex entries Tooling Reasoning	89	86	83	83	83	83	83	83	79	64	82%
20 codex entries Tooling Reasoning	97	97	92	88	85	85	81	81	81	70	86%
40 codex entries Tooling Reasoning	95	95	95	91	87	80	66	52	52	52	76%
tiers											79.60%
76.57%

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	100	0	0	0	0	0	0	0	0	20%
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%
93.33%

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	50	47	41	41	38	38	18	1	0	0	27%
Write 200 words with 50% dialogue Rule Following Utility	90	69	49	47	44	43	41	34	10	10	44%
Write 200 words with 90% dialogue Rule Following Utility	100	93	92	84	83	64	59	58	50	46	73%
dialogue-200											47.98%
dialogue-500
Write 500 words with 30% dialogue Rule Following Utility	28	12	4	2	0	0	0	0	0	0	5%
Write 500 words with 50% dialogue Rule Following Utility	50	48	20	18	15	6	5	0	0	0	16%
Write 500 words with 70% dialogue Rule Following Utility	49	49	41	38	23	12	8	4	4	0	23%
dialogue-500											14.54%
Ungrouped
Write unattributed dialogue Rule Following	100	100	100	100	61	61	61	61	14	14	67%
36.36%

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	0	80%
Friend got new kittens (German) Language	100	100	100	100	0	80%
Friend got new kittens (Tagalog) Language	100	100	100	100	100	100%
80.00%

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	79	96%
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	96	82	80	92%
97.50%

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	98	98	98	97	96	99%
Write sentences with 10 words each Utility	94	94	93	91	89	89	87	86	85	65	87%
Write sentences with 20 words each Utility	100	92	87	83	78	76	74	74	70	59	79%
88.40%

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	0	0	0	0	0	0	0	0	0	0	0%
outline-count											66.67%
pov-count
Count point of views for Jack and Olivia Utility	50	50	50	50	50	0	0	0	0	0	25%
Count point of views for Jack Harper Utility	0	0	0	0	0	0	0	0	0	0	0%
Count point of views for Olivia Utility	0	0	0	0	0	0	0	0	0	0	0%
pov-count											8.33%
37.50%

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	100	96	96	96	96	96	95	97%
Expand all contractions Text Editing	90	88	88	88	88	88	88	88%
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	83	83	83	83	83	80	74	81%
Passive voice → active voice Text Editing Hallucination	93	91	91	90	90	89	89	91%
POV shift: 3rd person to 1st person (Elena's perspective) Text Editing	100	100	100	100	100	100	99	100%
Tense rewriting: past to present Text Editing	99	99	97	96	96	88	82	94%
Generic Prompt								94.47%
Specific Prompt
Avoid said/asked/replied/answered Text Editing	89	89	89	89	89	89	78	87%
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	98	98	98	98	98	98%
Expand all contractions Text Editing	100	100	100	100	99	99	97	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	95	95	95	95	95	95	93	95%
Passive voice → active voice Text Editing Hallucination	92	90	90	89	89	89	87	90%
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								96.59%
95.53%

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	0	0	0	0	0	0	0	0	0	0	0%
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	0	0	0	0	0	0	0	0	0	0	0%
40.00%

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	100	100	100	100%
50 sentence summary Utility	100	100	100	98	98	98	98	98	92	27	91%
sentences											98.23%
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	92	99%
50 word summary Utility	100	100	100	100	98	98	98	92	92	77	96%
100 word summary Utility	100	100	100	98	98	98	92	77	54	0	82%
200 word summary Utility	100	100	9	2	0	0	0	0	0	0	21%
words											79.48%
91.43%