Gemini 3.1 Flash Lite

google/gemini-3.1-flash-lite

Gemini 3.1 Flash Lite

via OpenRouter

Release Date

May 7th, 2026

Context Size

Reasoning

Benchmark Cost

$0.94

Speed

156.8 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	67	66	66	64	62	65%
Horror: alone in an eerie place at night Creative Writing Hallucination	69	69	67	66	64	67%
Literary fiction: old friends reunite Creative Writing Hallucination	79	75	74	71	71	74%
Mystery: examining a crime scene Creative Writing Hallucination	80	72	70	66	66	71%
Romance: separated couple reunites Creative Writing Hallucination	79	77	76	76	75	76%
Thriller: chase through city streets Creative Writing Hallucination	80	75	69	69	68	72%
Detailed Writing Rules						70.92%
genre
Fantasy: entering an ancient ruin Creative Writing Hallucination	77	76	74	74	73	75%
Horror: alone in an eerie place at night Creative Writing Hallucination	84	72	72	71	68	73%
Literary fiction: old friends reunite Creative Writing Hallucination	78	77	73	73	72	75%
Mystery: examining a crime scene Creative Writing Hallucination	82	82	77	76	70	78%
Romance: separated couple reunites Creative Writing Hallucination	75	74	71	71	70	72%
Thriller: chase through city streets Creative Writing Hallucination	76	74	73	72	68	72%
genre						74.24%
Novelcrafter Default Prompt
Fantasy: entering an ancient ruin Creative Writing Hallucination	89	84	84	78	78	83%
Horror: alone in an eerie place at night Creative Writing Hallucination	82	79	77	76	72	77%
Literary fiction: old friends reunite Creative Writing Hallucination	82	80	80	78	75	79%
Mystery: examining a crime scene Creative Writing Hallucination	84	80	75	73	73	77%
Romance: separated couple reunites Creative Writing Hallucination	81	79	76	75	71	77%
Thriller: chase through city streets Creative Writing Hallucination	82	81	78	77	72	78%
Novelcrafter Default Prompt						78.44%
74.53%

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	95	94	93	93	92	94%
Medium: The Hollow (Inferred) Tooling Reasoning	96	96	96	96	94	96%
Medium: Through the Thornveil (Scattered) Tooling Reasoning	96	94	94	93	93	94%
Short: The Rusty Lantern (Explicit) Tooling Reasoning	95	94	93	93	93	94%
94.23%

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	10	10	10	10	8	8	8	7	7	11%
Long text (~1594 words), small codex (11 entries) Hallucination	100	100	100	100	100	100	100	100	25	25	85%
Short text (~524 words), big codex (51 entries) Hallucination	38	17	17	17	17	17	17	17	13	10	18%
Short text (~524 words), small codex (11 entries) Hallucination	35	25	25	25	25	17	13	13	13	10	20%
basic entries											33.50%
detailed entries
Long text (~1594 words), big codex (51 detailed entries) Hallucination	17	17	17	17	13	13	13	10	10	10	13%
Long text (~1594 words), small codex (11 detailed entries) Hallucination	38	33	17	17	17	17	17	17	17	10	20%
Short text (~524 words), big codex (51 detailed entries) Hallucination	25	25	25	25	25	25	25	25	25	25	25%
Short text (~524 words), small codex (11 detailed entries) Hallucination	25	25	25	25	25	25	25	25	25	25	25%
detailed entries											20.79%
27.15%

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	87	86	83	83	81	81	81	81	79	77	82%
Large codex (40 entries), short passage (165 words) Tooling Reasoning	93	91	89	89	89	87	85	85	85	82	87%
Small codex (7 entries), long passage (734 words) Tooling Reasoning	88	83	83	83	83	83	83	83	83	83	84%
Small codex (7 entries), short passage (165 words) Tooling Reasoning	100	100	100	100	100	100	100	100	100	95	100%
matrix											88.18%
tiers
5 codex entries Tooling Reasoning	100	100	100	100	100	91	91	91	91	91	96%
10 codex entries Tooling Reasoning	100	100	100	94	94	86	86	86	86	72	91%
20 codex entries Tooling Reasoning	96	96	88	88	88	88	88	88	88	85	89%
40 codex entries Tooling Reasoning	92	92	92	92	92	92	87	83	83	83	89%
tiers											91.08%
89.63%

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	68	68	68	68	68	68	68	68	68	67	68%
Write 200 words with 50% dialogue Rule Following Utility	50	50	50	50	50	50	50	50	49	48	50%
Write 200 words with 90% dialogue Rule Following Utility	50	50	50	50	50	48	45	43	43	1	43%
dialogue-200											53.63%
dialogue-500
Write 500 words with 30% dialogue Rule Following Utility	49	45	34	22	3	2	0	0	0	0	16%
Write 500 words with 50% dialogue Rule Following Utility	50	50	50	38	34	18	14	8	0	0	26%
Write 500 words with 70% dialogue Rule Following Utility	89	49	48	48	43	34	3	1	0	0	32%
dialogue-500											24.37%
Ungrouped
Write unattributed dialogue Rule Following	100	100	100	100	100	100	100	100	100	100	100%
47.71%

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	100	100	100	0	0	60%
Friend got new kittens (Tagalog) Language	100	100	100	100	100	100%
85.00%

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	60	60	84%
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%
96.80%

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	0	0	0	70%
outline-count											90.00%
pov-count
Count point of views for Jack and Olivia Utility	100	100	100	100	100	100	100	50	0	0	75%
Count point of views for Jack Harper Utility	100	100	100	100	100	100	100	100	100	0	90%
Count point of views for Olivia Utility	100	100	100	100	100	100	100	100	0	0	80%
pov-count											81.67%
85.83%

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	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	96	94	94	94	94	93	93	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	96	96	96	96	96	96	96	96%
Generic Prompt								98.71%
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	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	97	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	99	100%
Specific Prompt								99.39%
99.05%

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	0	0	0	0	0	0	0	30%
Simple Rule Following	100	100	100	100	100	100	100	100	100	0	90%
Simple (1-shot) 1-shot Rule Following	100	100	100	100	100	100	100	100	0	0	80%
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%
76.00%

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	98	98	98	99%
50 sentence summary Utility	100	100	100	100	100	100	77	54	9	0	74%
sentences											94.68%
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	92	98%
200 word summary Utility	98	98	92	77	77	77	54	54	27	2	66%
words											92.67%
95.13%