Xiaomi MIMO v2.5 Pro

xiaomi/mimo-v2.5-pro

Xiaomi MIMO v2.5 Pro

via OpenRouter

Release Date

Apr 22nd, 2026

Context Size

Reasoning

Yes

Benchmark Cost

$4.37

Speed

54.0 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	85	79	77	77	70	78%
Horror: alone in an eerie place at night Creative Writing Hallucination	86	85	85	80	78	83%
Literary fiction: old friends reunite Creative Writing Hallucination	89	87	86	84	81	85%
Mystery: examining a crime scene Creative Writing Hallucination	92	88	87	86	85	88%
Romance: separated couple reunites Creative Writing Hallucination	90	88	87	86	86	87%
Thriller: chase through city streets Creative Writing Hallucination	91	91	90	87	87	89%
Detailed Writing Rules						84.97%
genre
Fantasy: entering an ancient ruin Creative Writing Hallucination	81	76	71	70	69	73%
Horror: alone in an eerie place at night Creative Writing Hallucination	83	82	75	74	73	77%
Literary fiction: old friends reunite Creative Writing Hallucination	78	77	77	76	69	75%
Mystery: examining a crime scene Creative Writing Hallucination	77	76	75	74	71	75%
Romance: separated couple reunites Creative Writing Hallucination	78	76	74	73	69	74%
Thriller: chase through city streets Creative Writing Hallucination	84	80	79	77	75	79%
genre						75.61%
Novelcrafter Default Prompt
Fantasy: entering an ancient ruin Creative Writing Hallucination	79	78	77	73	71	76%
Horror: alone in an eerie place at night Creative Writing Hallucination	83	82	81	81	80	81%
Literary fiction: old friends reunite Creative Writing Hallucination	84	82	82	82	78	82%
Mystery: examining a crime scene Creative Writing Hallucination	87	80	77	75	75	79%
Romance: separated couple reunites Creative Writing Hallucination	84	82	80	78	76	80%
Thriller: chase through city streets Creative Writing Hallucination	88	84	84	83	75	83%
Novelcrafter Default Prompt						80.04%
80.20%

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	98	97	97	96	95	97%
Medium: The Hollow (Inferred) Tooling Reasoning	96	96	95	95	94	95%
Medium: Through the Thornveil (Scattered) Tooling Reasoning	98	98	97	97	89	96%
Short: The Rusty Lantern (Explicit) Tooling Reasoning	100	99	99	98	94	98%
96.41%

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	100	100	25	17	17	17	17	59%
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	25	25	85%
Short text (~524 words), small codex (11 entries) Hallucination	100	100	100	100	100	100	25	25	25	25	70%
basic entries											78.54%
detailed entries
Long text (~1594 words), big codex (51 detailed entries) Hallucination	100	100	100	100	100	100	100	100	100	100	100%
Long text (~1594 words), small codex (11 detailed entries) Hallucination	100	100	100	100	100	100	100	25	25	25	78%
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	25	93%
detailed entries											92.50%
85.52%

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	96	95	94	94	93	93	92	91	91	90	93%
Large codex (40 entries), short passage (165 words) Tooling Reasoning	100	100	98	96	96	96	96	96	92	91	96%
Small codex (7 entries), long passage (734 words) Tooling Reasoning	100	100	95	95	92	92	91	91	83	83	92%
Small codex (7 entries), short passage (165 words) Tooling Reasoning	100	100	100	100	100	100	100	100	100	100	100%
matrix											95.32%
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	86	86	86	86	86	93%
20 codex entries Tooling Reasoning	100	100	97	96	96	92	92	92	88	88	94%
40 codex entries Tooling Reasoning	100	100	100	100	100	100	100	100	100	92	99%
tiers											96.59%
95.95%

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	50	50	50	50	50	50	50	50	50	50	50%
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%
87.50%

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	100	100	50	50	49	38	0	0	0	0	39%
Write 200 words with 50% dialogue Rule Following Utility	62	49	34	1	0	0	0	0	0	0	15%
Write 200 words with 90% dialogue Rule Following Utility	96	93	75	75	68	68	50	49	43	18	64%
dialogue-200											38.91%
dialogue-500
Write 500 words with 30% dialogue Rule Following Utility	49	46	30	25	2	2	1	0	0	0	16%
Write 500 words with 50% dialogue Rule Following Utility	48	33	1	0	0	0	0	0	0	0	8%
Write 500 words with 70% dialogue Rule Following Utility	70	50	4	2	0	0	0	0	0	0	13%
dialogue-500											12.11%
Ungrouped
Write unattributed dialogue Rule Following	100	100	100	100	100	100	100	100	100	61	96%
35.59%

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	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%
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	97	96	99%
Character dialogue (Hindi) in a story Language	100	100	100	100	0	80%
Character dialogue (Italian) in a story Language	100	100	100	100	74	95%
Character dialogue (Spanish) in a story Language	100	100	100	92	0	78%
90.37%

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	99	95	94	80	78	73	92%
Write sentences with 10 words each Utility	100	100	100	100	91	87	87	79	77	74	90%
Write sentences with 20 words each Utility	100	100	92	88	23	20	19	1	0	0	44%
75.30%

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	100	100	0	90%
outline-count											96.67%
pov-count
Count point of views for Jack and Olivia Utility	100	100	100	100	100	50	50	0	0	0	60%
Count point of views for Jack Harper Utility	100	100	100	100	100	100	100	100	0	0	80%
Count point of views for Olivia Utility	100	100	100	100	100	100	100	100	100	100	100%
pov-count											80.00%
88.33%

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	99	99	99	98	99%
Expand all contractions Text Editing	100	100	100	100	99	99	98	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	50	50	86%
Passive voice → active voice Text Editing Hallucination	95	93	92	92	92	89	88	92%
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	99	99	99	99	97	93	98%
Generic Prompt								97.11%
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	99	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	100	99	99	98	96	95	92	97%
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								99.58%
98.35%

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	0	90%
Simple Rule Following	100	100	100	100	100	100	0	0	0	0	60%
Simple (1-shot) 1-shot Rule Following	100	100	100	100	100	0	0	0	0	0	50%
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	100	100	0	90%
72.00%

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	98	77	54	54	0	78%
50 sentence summary Utility	100	100	92	92	9	2	0	0	0	0	40%
sentences											83.55%
words
10 word summary Utility	100	100	100	100	100	100	100	100	100	98	100%
20 word summary Utility	100	100	100	100	100	100	98	98	98	77	97%
50 word summary Utility	100	100	98	92	77	54	54	27	27	0	63%
100 word summary Utility	98	54	54	2	0	0	0	0	0	0	21%
200 word summary Utility	0	0	0	0	0	0	0	0	0	0	0%
words											56.15%
76.81%