Xiaomi MIMO v2.5 - NC Bench

xiaomi/mimo-v2.5

Xiaomi MIMO v2.5

via OpenRouter

Release Date

Apr 22nd, 2026

Context Size

Reasoning

Yes

Benchmark Cost

$2.81

Speed

94.2 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	73	72	68	66	70%
Horror: alone in an eerie place at night Creative Writing Hallucination	81	78	77	71	70	75%
Literary fiction: old friends reunite Creative Writing Hallucination	84	82	80	78	77	80%
Mystery: examining a crime scene Creative Writing Hallucination	88	84	80	79	76	81%
Romance: separated couple reunites Creative Writing Hallucination	85	84	81	81	76	81%
Thriller: chase through city streets Creative Writing Hallucination	85	85	79	79	78	81%
Detailed Writing Rules						78.27%
genre
Fantasy: entering an ancient ruin Creative Writing Hallucination	82	75	74	73	73	75%
Horror: alone in an eerie place at night Creative Writing Hallucination	82	80	80	76	74	78%
Literary fiction: old friends reunite Creative Writing Hallucination	82	78	78	75	74	77%
Mystery: examining a crime scene Creative Writing Hallucination	79	78	77	77	73	77%
Romance: separated couple reunites Creative Writing Hallucination	82	78	76	74	74	77%
Thriller: chase through city streets Creative Writing Hallucination	82	82	81	72	72	78%
genre						77.04%
Novelcrafter Default Prompt
Fantasy: entering an ancient ruin Creative Writing Hallucination	83	77	75	70	66	74%
Horror: alone in an eerie place at night Creative Writing Hallucination	84	79	78	78	75	79%
Literary fiction: old friends reunite Creative Writing Hallucination	83	80	80	79	76	79%
Mystery: examining a crime scene Creative Writing Hallucination	88	84	83	83	73	82%
Romance: separated couple reunites Creative Writing Hallucination	87	83	82	81	81	83%
Thriller: chase through city streets Creative Writing Hallucination	87	80	79	76	75	79%
Novelcrafter Default Prompt						79.47%
78.26%

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	98	97	97	96	97%
Medium: The Hollow (Inferred) Tooling Reasoning	97	97	96	94	94	96%
Medium: Through the Thornveil (Scattered) Tooling Reasoning	98	98	97	95	93	96%
Short: The Rusty Lantern (Explicit) Tooling Reasoning	100	99	99	99	95	98%
96.86%

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	100	100	100	100	25	93%
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	25	25	25	78%
Short text (~524 words), small codex (11 entries) Hallucination	100	100	100	100	100	25	25	25	25	25	63%
basic entries											83.13%
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	100	25	25	85%
Short text (~524 words), big codex (51 detailed entries) Hallucination	100	100	100	100	100	100	100	25	25	25	78%
Short text (~524 words), small codex (11 detailed entries) Hallucination	100	100	100	100	100	100	100	100	100	17	92%
detailed entries											88.54%
85.83%

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	95	95	94	93	91	91	90	87	87	41	86%
Large codex (40 entries), short passage (165 words) Tooling Reasoning	98	98	96	95	95	93	93	92	91	89	94%
Small codex (7 entries), long passage (734 words) Tooling Reasoning	97	97	97	97	97	92	92	88	88	88	93%
Small codex (7 entries), short passage (165 words) Tooling Reasoning	100	100	100	100	100	100	100	100	97	97	99%
matrix											93.18%
tiers
5 codex entries Tooling Reasoning	100	100	100	100	100	100	100	100	100	91	99%
10 codex entries Tooling Reasoning	100	100	100	100	100	100	100	100	100	86	99%
20 codex entries Tooling Reasoning	97	96	96	92	89	88	86	85	85	81	89%
40 codex entries Tooling Reasoning	100	100	100	100	100	100	97	92	92	92	97%
tiers											96.09%
94.63%

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	50	50	50	50	50	50	50	50	60%
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%
88.33%

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	98	97	63	50	30	5	0	0	0	0	34%
Write 200 words with 50% dialogue Rule Following Utility	66	57	50	50	50	50	50	26	0	0	40%
Write 200 words with 90% dialogue Rule Following Utility	97	95	80	68	62	51	49	48	0	0	55%
dialogue-200											43.08%
dialogue-500
Write 500 words with 30% dialogue Rule Following Utility	47	18	14	0	0	0	0	0	0	0	8%
Write 500 words with 50% dialogue Rule Following Utility	50	49	43	38	34	1	1	0	0	0	22%
Write 500 words with 70% dialogue Rule Following Utility	40	5	2	1	1	0	0	0	0	0	5%
dialogue-500											11.40%
Ungrouped
Write unattributed dialogue Rule Following	100	100	100	100	100	100	100	100	61	61	92%
36.51%

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	0	0	60%
Asking for directions (German) Language	100	100	100	0	0	60%
Friend got new kittens (German) Language	100	100	0	0	0	40%
Friend got new kittens (Tagalog) Language	100	100	100	100	100	100%
65.00%

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	95	99%
Character dialogue (German) in a story Language	100	100	100	100	80	96%
Character dialogue (Hindi) in a story Language	95	63	59	50	50	63%
Character dialogue (Italian) in a story Language	100	100	100	100	100	100%
Character dialogue (Spanish) in a story Language	100	100	100	100	0	80%
87.66%

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	97	79	78	61	32	1	75%
Write sentences with 10 words each Utility	100	91	84	76	75	74	62	51	49	37	70%
Write sentences with 20 words each Utility	100	83	21	5	1	0	0	0	0	0	21%
55.27%

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	0	0	0	0	0	50%
outline-count											83.33%
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	0	0	0	0	0	0	0	0	0	0	0%
pov-count											55.00%
69.17%

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	100	99	99	99	99	98	97	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	99	99	74	96%
Passive voice → active voice Text Editing Hallucination	96	96	95	94	93	92	89	94%
POV shift: 3rd person to 1st person (Elena's perspective) Text Editing	100	100	100	100	100	99	66	95%
Tense rewriting: past to present Text Editing	100	100	100	99	99	99	97	99%
Generic Prompt								98.05%
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	99	99	99	99	99	96	99%
Expand all contractions Text Editing	100	100	100	100	99	99	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	98	96	96	94	92	91	88	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								99.12%
98.59%

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	0	0	0	0	0	50%
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	100	100	100	100	0	90%
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	0	0	0	70%
70.00%

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	0	0	80%
paragraphs											93.33%
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	98	9	91%
50 sentence summary Utility	100	100	100	100	27	2	0	0	0	0	43%
sentences											86.72%
words
10 word summary Utility	100	100	100	100	100	100	100	98	98	98	100%
20 word summary Utility	100	100	100	100	100	98	98	98	98	92	99%
50 word summary Utility	100	100	100	100	100	92	92	77	77	77	92%
100 word summary Utility	100	92	92	77	77	54	27	27	9	0	56%
200 word summary Utility	100	92	0	0	0	0	0	0	0	0	19%
words											72.92%
82.94%