Gemma 4 31B - NC Bench

google/gemma-4-31b-it

Gemma 4 31B

via OpenRouter

Release Date

Apr 3rd, 2026

Context Size

256k

Reasoning

Benchmark Cost

$0.37

Speed

24.1 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	75	72	70	68	68	70%
Horror: alone in an eerie place at night Creative Writing Hallucination	81	78	77	76	73	77%
Literary fiction: old friends reunite Creative Writing Hallucination	82	81	81	79	73	79%
Mystery: examining a crime scene Creative Writing Hallucination	80	78	78	72	72	76%
Romance: separated couple reunites Creative Writing Hallucination	84	79	79	77	74	79%
Thriller: chase through city streets Creative Writing Hallucination	83	75	74	73	72	75%
Detailed Writing Rules						76.16%
genre
Fantasy: entering an ancient ruin Creative Writing Hallucination	70	69	67	67	66	68%
Horror: alone in an eerie place at night Creative Writing Hallucination	79	76	74	70	69	74%
Literary fiction: old friends reunite Creative Writing Hallucination	74	72	69	68	67	70%
Mystery: examining a crime scene Creative Writing Hallucination	74	73	71	69	68	71%
Romance: separated couple reunites Creative Writing Hallucination	74	73	73	73	67	72%
Thriller: chase through city streets Creative Writing Hallucination	79	77	75	71	66	74%
genre						71.31%
Novelcrafter Default Prompt
Fantasy: entering an ancient ruin Creative Writing Hallucination	79	76	75	73	73	75%
Horror: alone in an eerie place at night Creative Writing Hallucination	79	77	77	75	73	76%
Literary fiction: old friends reunite Creative Writing Hallucination	82	79	78	76	75	78%
Mystery: examining a crime scene Creative Writing Hallucination	80	79	78	76	73	77%
Romance: separated couple reunites Creative Writing Hallucination	80	78	77	72	71	76%
Thriller: chase through city streets Creative Writing Hallucination	84	79	79	78	78	80%
Novelcrafter Default Prompt						76.95%
74.81%

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	96	96%
Medium: The Hollow (Inferred) Tooling Reasoning	98	98	97	96	96	97%
Medium: Through the Thornveil (Scattered) Tooling Reasoning	98	98	98	98	98	98%
Short: The Rusty Lantern (Explicit) Tooling Reasoning	95	95	94	94	94	94%
96.32%

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	33	13	13	10	10	8	8	6	6	14%
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											78.55%
detailed entries
Long text (~1594 words), big codex (51 detailed entries) Hallucination	25	25	25	25	25	25	25	25	25	25	25%
Long text (~1594 words), small codex (11 detailed entries) Hallucination	25	25	25	25	25	25	25	25	25	25	25%
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											62.50%
70.52%

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	94	94	93	93	92	92	92	92	91	91	92%
Large codex (40 entries), short passage (165 words) Tooling Reasoning	96	96	96	96	96	96	96	91	91	91	94%
Small codex (7 entries), long passage (734 words) Tooling Reasoning	100	100	97	97	97	97	97	97	97	93	97%
Small codex (7 entries), short passage (165 words) Tooling Reasoning	100	97	97	97	97	97	97	97	97	97	97%
matrix											95.17%
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	100	100	100%
20 codex entries Tooling Reasoning	92	92	92	92	92	92	92	92	92	92	92%
40 codex entries Tooling Reasoning	100	100	100	100	100	100	100	100	100	100	100%
tiers											98.11%
96.64%

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	100	100	100	100	0	0	0	0	60%
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%
96.67%

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	91	90	89	83	79	68	68	68	66	65	77%
Write 200 words with 50% dialogue Rule Following Utility	45	45	43	26	26	26	22	10	7	1	25%
Write 200 words with 90% dialogue Rule Following Utility	46	35	35	21	19	19	18	18	18	18	25%
dialogue-200											42.37%
dialogue-500
Write 500 words with 30% dialogue Rule Following Utility	0	0	0	0	0	0	0	0	0	0	0%
Write 500 words with 50% dialogue Rule Following Utility	0	0	0	0	0	0	0	0	0	0	0%
Write 500 words with 70% dialogue Rule Following Utility	0	0	0	0	0	0	0	0	0	0	0%
dialogue-500											0.01%
Ungrouped
Write unattributed dialogue Rule Following	100	100	100	100	100	100	100	100	100	100	100%
32.45%

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	0	80%
Friend got new kittens (German) Language	0	0	0	0	0	0%
Friend got new kittens (Tagalog) Language	100	0	0	0	0	20%
50.00%

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	97	100%
Write sentences with 20 words each Utility	90	84	66	65	61	61	61	61	61	61	67%
88.88%

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	100	100	100	50	50	50	50	50	50	0	60%
Count point of views for Jack Harper Utility	100	100	100	100	100	100	0	0	0	0	60%
Count point of views for Olivia Utility	100	100	100	100	100	100	100	100	100	0	90%
pov-count											70.00%
75.00%

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	99	98	98	98	98	96	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	99	99	99	99	96	96	96	98%
Generic Prompt								99.46%
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	100	100	100%
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	99	99	98	98	98	98	98	99%
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								99.85%
99.66%

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	100	100	100	100	100	100	100	100	100	100	100%
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%
100.00%

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	100	100	100	100	100	100	100	100%
sentences											99.99%
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	98	98	98	98	98	92	77	96%
200 word summary Utility	27	9	9	2	2	0	0	0	0	0	5%
words											80.20%
92.38%