Gemini 2.5 Flash Lite

google/gemini-2.5-flash-lite

Gemini 2.5 Flash Lite

via OpenRouter

Release Date

Jul 22nd, 2025

Context Size

Reasoning

Benchmark Cost

$0.37

Speed

209.8 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	77	75	72	70	67	72%
Horror: alone in an eerie place at night Creative Writing Hallucination	73	73	71	70	70	72%
Literary fiction: old friends reunite Creative Writing Hallucination	77	76	74	70	70	73%
Mystery: examining a crime scene Creative Writing Hallucination	83	81	76	74	73	77%
Romance: separated couple reunites Creative Writing Hallucination	78	76	74	73	70	74%
Thriller: chase through city streets Creative Writing Hallucination	86	84	81	81	73	81%
Detailed Writing Rules						74.84%
genre
Fantasy: entering an ancient ruin Creative Writing Hallucination	78	75	73	70	68	73%
Horror: alone in an eerie place at night Creative Writing Hallucination	82	78	77	74	72	76%
Literary fiction: old friends reunite Creative Writing Hallucination	83	82	77	75	67	77%
Mystery: examining a crime scene Creative Writing Hallucination	80	79	77	76	72	77%
Romance: separated couple reunites Creative Writing Hallucination	74	73	72	71	70	72%
Thriller: chase through city streets Creative Writing Hallucination	84	81	80	77	73	79%
genre						75.63%
Novelcrafter Default Prompt
Fantasy: entering an ancient ruin Creative Writing Hallucination	75	73	72	71	69	72%
Horror: alone in an eerie place at night Creative Writing Hallucination	85	80	78	76	75	79%
Literary fiction: old friends reunite Creative Writing Hallucination	82	75	74	74	71	75%
Mystery: examining a crime scene Creative Writing Hallucination	83	77	77	74	71	76%
Romance: separated couple reunites Creative Writing Hallucination	74	72	72	69	60	69%
Thriller: chase through city streets Creative Writing Hallucination	87	85	81	81	79	83%
Novelcrafter Default Prompt						75.66%
75.38%

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	92	91	91	91	92%
Medium: The Hollow (Inferred) Tooling Reasoning	96	95	94	90	87	92%
Medium: Through the Thornveil (Scattered) Tooling Reasoning	92	90	90	88	85	89%
Short: The Rusty Lantern (Explicit) Tooling Reasoning	96	95	93	91	87	92%
91.24%

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	4	4	2	2	2	1	1	31%
Long text (~1594 words), small codex (11 entries) Hallucination	100	100	100	100	100	100	100	17	17	6	74%
Short text (~524 words), big codex (51 entries) Hallucination	10	10	5	5	5	4	4	4	4	4	5%
Short text (~524 words), small codex (11 entries) Hallucination	17	17	13	10	10	10	6	6	4	3	9%
basic entries											30.08%
detailed entries
Long text (~1594 words), big codex (51 detailed entries) Hallucination	100	100	100	26	25	3	2	2	0	0	36%
Long text (~1594 words), small codex (11 detailed entries) Hallucination	100	100	8	7	7	5	5	4	3	1	24%
Short text (~524 words), big codex (51 detailed entries) Hallucination	100	100	100	13	13	13	4	2	2	2	35%
Short text (~524 words), small codex (11 detailed entries) Hallucination	100	6	6	5	4	4	3	3	3	3	13%
detailed entries											27.05%
28.56%

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	61	61	56	49	48	42	0	0	0	0	32%
Large codex (40 entries), short passage (165 words) Tooling Reasoning	85	82	78	76	76	74	71	68	68	66	74%
Small codex (7 entries), long passage (734 words) Tooling Reasoning	88	87	80	80	80	80	79	75	70	66	79%
Small codex (7 entries), short passage (165 words) Tooling Reasoning	88	88	88	88	88	88	88	88	88	83	88%
matrix											68.05%
tiers
5 codex entries Tooling Reasoning	75	75	67	67	67	67	67	67	67	67	68%
10 codex entries Tooling Reasoning	94	94	89	86	79	79	79	79	72	66	82%
20 codex entries Tooling Reasoning	100	97	96	89	85	85	81	77	0	0	71%
40 codex entries Tooling Reasoning	66	65	59	58	56	54	49	18	0	0	43%
tiers											65.97%
67.01%

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	50	50	50	49	47	0	0	0	0	0	25%
Write 200 words with 50% dialogue Rule Following Utility	66	50	50	49	38	4	0	0	0	0	26%
Write 200 words with 90% dialogue Rule Following Utility	95	88	84	76	72	72	72	59	50	49	72%
dialogue-200											40.57%
dialogue-500
Write 500 words with 30% dialogue Rule Following Utility	50	50	47	26	3	0	0	0	0	0	18%
Write 500 words with 50% dialogue Rule Following Utility	50	47	43	34	30	5	3	0	0	0	21%
Write 500 words with 70% dialogue Rule Following Utility	50	50	45	22	0	0	0	0	0	0	17%
dialogue-500											18.50%
Ungrouped
Write unattributed dialogue Rule Following	100	100	100	100	100	100	100	100	100	61	96%
39.04%

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	0	0	0	40%
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	93	92	83	94%
Character dialogue (German) in a story Language	100	100	100	100	89	98%
Character dialogue (Hindi) in a story Language	93	78	64	60	60	71%
Character dialogue (Italian) in a story Language	100	100	92	90	86	93%
Character dialogue (Spanish) in a story Language	100	91	87	80	0	72%
85.50%

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	98	96	95	93	91	89	86	86	72	91%
Write sentences with 10 words each Utility	85	74	73	61	61	60	50	39	37	22	56%
Write sentences with 20 words each Utility	47	34	4	2	2	0	0	0	0	0	9%
51.95%

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	100	100	100	100	100	100	100	100	100	100%
Count point of views for Jack Harper Utility	100	100	100	100	0	0	0	0	0	0	40%
Count point of views for Olivia Utility	0	0	0	0	0	0	0	0	0	0	0%
pov-count											46.67%
56.67%

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	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	72	72	72	72	72	72	63	70%
Passive voice → active voice Text Editing Hallucination	94	93	93	93	89	88	77	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	99	99	99	99	96	96	96	98%
Generic Prompt								95.15%
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	96	94	94	93	93	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	100	100	100	100	100	100	100	100%
Specific Prompt								99.25%
97.20%

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	0	0	0	0	0	0	0	0	0	10%
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	100	0	90%
Simple (5-shot) Few-shot Rule Following	100	100	100	100	100	100	100	0	0	0	70%
Unattributed dialogue Rule Following	100	100	100	100	100	100	100	0	0	0	70%
66.00%

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	98	92	92	54	0	84%
20 sentence summary Utility	100	100	54	2	0	0	0	0	0	0	26%
50 sentence summary Utility	100	98	98	92	77	54	54	2	0	0	58%
sentences											73.32%
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	98	98	98	92	92	98%
50 word summary Utility	100	100	98	98	98	92	92	92	77	2	85%
100 word summary Utility	98	98	77	77	54	54	27	27	0	0	51%
200 word summary Utility	2	0	0	0	0	0	0	0	0	0	0%
words											66.90%
77.01%