Gemini 3 Flash (Preview)

google/gemini-3-flash-preview

Gemini 3 Flash (Preview)

via OpenRouter

Release Date

Dec 17th, 2025

Context Size

Reasoning

Benchmark Cost

$2.84

Speed

111.3 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	73	72	70	69	69	71%
Horror: alone in an eerie place at night Creative Writing Hallucination	78	76	74	74	74	75%
Literary fiction: old friends reunite Creative Writing Hallucination	79	76	74	73	70	75%
Mystery: examining a crime scene Creative Writing Hallucination	78	75	74	71	69	73%
Romance: separated couple reunites Creative Writing Hallucination	79	78	76	73	72	76%
Thriller: chase through city streets Creative Writing Hallucination	79	75	73	71	71	74%
Detailed Writing Rules						73.98%
genre
Fantasy: entering an ancient ruin Creative Writing Hallucination	72	72	69	68	66	70%
Horror: alone in an eerie place at night Creative Writing Hallucination	77	76	73	73	71	74%
Literary fiction: old friends reunite Creative Writing Hallucination	81	77	73	70	68	74%
Mystery: examining a crime scene Creative Writing Hallucination	74	72	72	71	68	72%
Romance: separated couple reunites Creative Writing Hallucination	76	74	73	71	69	72%
Thriller: chase through city streets Creative Writing Hallucination	75	72	72	68	68	71%
genre						72.10%
Novelcrafter Default Prompt
Fantasy: entering an ancient ruin Creative Writing Hallucination	83	79	73	73	71	76%
Horror: alone in an eerie place at night Creative Writing Hallucination	80	76	75	75	73	76%
Literary fiction: old friends reunite Creative Writing Hallucination	81	80	78	78	77	79%
Mystery: examining a crime scene Creative Writing Hallucination	80	79	78	74	73	77%
Romance: separated couple reunites Creative Writing Hallucination	77	76	74	74	71	74%
Thriller: chase through city streets Creative Writing Hallucination	83	76	75	73	69	75%
Novelcrafter Default Prompt						76.19%
74.09%

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	99	98	98	97	97	98%
Medium: The Hollow (Inferred) Tooling Reasoning	98	95	95	94	94	95%
Medium: Through the Thornveil (Scattered) Tooling Reasoning	99	99	98	98	94	98%
Short: The Rusty Lantern (Explicit) Tooling Reasoning	99	99	98	98	96	98%
97.11%

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	33	8	7	7	7	7	5	5	5	3	9%
Long text (~1594 words), small codex (11 entries) Hallucination	35	13	13	13	10	10	8	8	8	8	13%
Short text (~524 words), big codex (51 entries) Hallucination	25	17	17	17	17	17	17	13	13	13	16%
Short text (~524 words), small codex (11 entries) Hallucination	25	17	17	17	17	17	17	17	13	13	17%
basic entries											13.55%
detailed entries
Long text (~1594 words), big codex (51 detailed entries) Hallucination	35	31	13	13	13	13	13	10	10	5	15%
Long text (~1594 words), small codex (11 detailed entries) Hallucination	13	13	13	10	10	10	8	8	8	7	10%
Short text (~524 words), big codex (51 detailed entries) Hallucination	25	17	17	17	13	13	13	13	10	10	15%
Short text (~524 words), small codex (11 detailed entries) Hallucination	25	17	17	17	17	17	17	17	10	10	16%
detailed entries											13.98%
13.77%

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	93	92	92	91	90	90	90	88	88	88	90%
Large codex (40 entries), short passage (165 words) Tooling Reasoning	96	96	96	96	96	91	91	91	91	87	93%
Small codex (7 entries), long passage (734 words) Tooling Reasoning	97	88	88	88	88	88	88	88	88	83	88%
Small codex (7 entries), short passage (165 words) Tooling Reasoning	100	100	100	100	100	100	100	100	100	100	100%
matrix											92.83%
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	92	92	92	92	92	92	83	83	83	90%
tiers											95.61%
94.22%

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	0	0	0	0	0	0	0	0	0	0	0%
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%
91.67%

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	99	95	68	68	68	68	68	67	67	64	73%
Write 200 words with 50% dialogue Rule Following Utility	50	50	49	49	49	45	45	34	10	10	39%
Write 200 words with 90% dialogue Rule Following Utility	92	68	62	59	56	56	56	36	26	23	53%
dialogue-200											55.27%
dialogue-500
Write 500 words with 30% dialogue Rule Following Utility	50	50	49	49	49	49	41	2	0	0	34%
Write 500 words with 50% dialogue Rule Following Utility	38	7	0	0	0	0	0	0	0	0	4%
Write 500 words with 70% dialogue Rule Following Utility	54	50	41	41	27	2	0	0	0	0	21%
dialogue-500											19.91%
Ungrouped
Write unattributed dialogue Rule Following	100	100	100	100	100	100	100	100	100	100	100%
46.50%

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	100	100	100	100	100	100%
Friend got new kittens (German) Language	100	100	100	100	0	80%
Friend got new kittens (Tagalog) Language	100	100	100	100	100	100%
90.00%

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	95	95	94	90	97%
99.16%

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	100	50	50	50	50	50	50	0	0	0	40%
Count point of views for Jack Harper Utility	100	100	100	100	100	0	0	0	0	0	50%
Count point of views for Olivia Utility	100	100	100	0	0	0	0	0	0	0	30%
pov-count											40.00%
53.33%

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	98	98	98	98	98%
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	96	96	96	96	96	97%
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	95	95	95	94	94	94	91	94%
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	97	97	97	96	96	95	95	96%
Generic Prompt								98.41%
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	98	98	98	98	98	98	98	98%
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	99	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	99	99	99	97	99%
Specific Prompt								99.59%
99.00%

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	67	97%
96.67%

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	100	100	100%
Simple Rule Following	100	100	100	0	0	0	0	0	0	0	30%
Simple (1-shot) 1-shot Rule Following	100	100	100	100	100	100	100	0	0	0	70%
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%
80.00%

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	100	100	100	98	98	98	98	99%
200 word summary Utility	100	92	92	92	92	77	54	54	2	2	66%
words											92.98%
97.29%