Aion 3.5 Mini (Reasoning, High)

aion-labs/aion-3.5-mini

Aion 3.5 Mini (Reasoning, High)

via OpenRouter

Release Date

Sep 23rd, 2026

Context Size

262k

Reasoning

Yes

Benchmark Cost

$5.39

Speed

46.0 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	96	94	93	90	89	92%
Horror: alone in an eerie place at night Creative Writing Hallucination	96	96	93	93	90	94%
Literary fiction: old friends reunite Creative Writing Hallucination	99	93	89	85	83	90%
Mystery: examining a crime scene Creative Writing Hallucination	95	94	92	90	89	92%
Romance: separated couple reunites Creative Writing Hallucination	91	90	88	85	82	87%
Thriller: chase through city streets Creative Writing Hallucination	98	94	92	91	85	92%
Detailed Writing Rules						91.19%
genre
Fantasy: entering an ancient ruin Creative Writing Hallucination	87	85	84	82	82	84%
Horror: alone in an eerie place at night Creative Writing Hallucination	90	82	80	80	78	82%
Literary fiction: old friends reunite Creative Writing Hallucination	88	85	82	80	78	83%
Mystery: examining a crime scene Creative Writing Hallucination	90	88	87	86	83	87%
Romance: separated couple reunites Creative Writing Hallucination	86	85	83	75	75	81%
Thriller: chase through city streets Creative Writing Hallucination	89	88	86	79	74	83%
genre						83.25%
Novelcrafter Default Prompt
Fantasy: entering an ancient ruin Creative Writing Hallucination	91	87	85	84	71	84%
Horror: alone in an eerie place at night Creative Writing Hallucination	91	89	89	88	86	88%
Literary fiction: old friends reunite Creative Writing Hallucination	89	89	87	87	86	88%
Mystery: examining a crime scene Creative Writing Hallucination	90	89	88	88	87	88%
Romance: separated couple reunites Creative Writing Hallucination	86	85	81	80	79	82%
Thriller: chase through city streets Creative Writing Hallucination	95	94	84	82	79	87%
Novelcrafter Default Prompt						86.16%
86.87%

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	97	97	97%
Medium: The Hollow (Inferred) Tooling Reasoning	98	98	97	97	96	97%
Medium: Through the Thornveil (Scattered) Tooling Reasoning	99	98	98	98	97	98%
Short: The Rusty Lantern (Explicit) Tooling Reasoning	99	99	99	99	95	98%
97.65%

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	17	17	17	17	17	17	–	44%
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	100	100	100%
Short text (~524 words), small codex (11 entries) Hallucination	100	100	100	100	100	100	100	100	100	100	100%
basic entries											86.11%
detailed entries
Long text (~1594 words), big codex (51 detailed entries) Hallucination	100	100	100	100	100	100	100	100	100	25	93%
Long text (~1594 words), small codex (11 detailed entries) Hallucination	100	100	100	100	100	100	100	100	100	100	100%
Short text (~524 words), big codex (51 detailed entries) Hallucination	100	100	100	100	100	100	100	100	25	25	85%
Short text (~524 words), small codex (11 detailed entries) Hallucination	100	100	100	100	100	100	25	25	25	25	70%
detailed entries											86.87%
86.49%

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	100	100	100	100	99	99	99	99	97	94	99%
Large codex (40 entries), short passage (165 words) Tooling Reasoning	100	98	97	97	97	96	96	93	93	93	96%
Small codex (7 entries), long passage (734 words) Tooling Reasoning	100	100	100	100	97	95	95	95	95	87	97%
Small codex (7 entries), short passage (165 words) Tooling Reasoning	100	100	100	100	100	100	100	100	100	95	100%
matrix											97.72%
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	0	90%
20 codex entries Tooling Reasoning	100	100	100	100	97	96	92	92	88	88	95%
40 codex entries Tooling Reasoning	100	100	100	100	100	100	100	100	100	100	100%
tiers											96.12%
96.92%

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	50	95%
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	50	50	90%
Guess the pet Reasoning	100	100	100	100	100	100	100	100	50	50	90%
Highest-rated movie Reasoning	100	100	100	100	100	100	100	100	50	50	90%
Indirect birth year Reasoning	100	100	100	100	100	100	100	100	50	0	85%
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%
Who's the sister? Reasoning	100	100	100	100	100	100	100	100	100	50	95%
Who's the tallest? Reasoning	100	100	100	100	100	100	100	100	100	100	100%
95.00%

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	100	100	100	100	100	100	97	18	92%
Write 200 words with 50% dialogue Rule Following Utility	100	100	100	100	100	100	100	99	71	0	87%
Write 200 words with 90% dialogue Rule Following Utility	100	100	100	100	99	97	91	90	82	80	94%
dialogue-200											90.80%
dialogue-500
Write 500 words with 30% dialogue Rule Following Utility	98	93	90	86	79	50	48	48	32	26	65%
Write 500 words with 50% dialogue Rule Following Utility	90	89	83	50	50	47	22	3	2	0	44%
Write 500 words with 70% dialogue Rule Following Utility	51	50	50	46	19	5	4	0	0	0	23%
dialogue-500											43.71%
Ungrouped
Write unattributed dialogue Rule Following	100	100	100	100	100	100	100	100	100	0	90%
70.50%

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	100	100%
Asking for directions (German) Language	100	100	100	100	100	100%
Friend got new kittens (German) Language	100	100	100	100	100	100%
Friend got new kittens (Tagalog) Language	100	100	100	100	100	100%
100.00%

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	96	99%
Character dialogue (Hindi) in a story Language	100	100	100	100	47	89%
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%
97.69%

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	95	91	67	95%
Write sentences with 20 words each Utility	100	100	100	100	100	100	100	100	100	100	100%
98.42%

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	100	100	100	100	50	95%
Count point of views for Jack Harper Utility	100	100	100	100	100	100	100	100	100	100	100%
Count point of views for Olivia Utility	100	100	100	100	100	100	100	100	100	100	100%
pov-count											98.33%
97.50%

Relationship tree

Extracts a deterministic XML family and relationship tree from cumulative literary prose.

Scenario	#1	#2	#3	#4	#5	Total
Core relationship tree Tooling Reasoning Hallucination	98	98	97	86	85	93%
Family relationship tree Tooling Reasoning Hallucination	84	82	82	82	46	75%
84.17%

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	99	99	99	99	99	99	98	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	33	90%
Multi-character gender swap: Priya(F)->Rohan(M), Mara unchanged Text Editing	100	100	99	99	99	99	99	100%
Passive voice → active voice Text Editing Hallucination	97	97	96	96	96	95	95	96%
POV shift: 3rd person to 1st person (Elena's perspective) Text Editing	100	100	100	100	100	100	99	100%
Tense rewriting: past to present Text Editing	100	100	100	100	100	99	99	100%
Generic Prompt								98.26%
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	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	33	90%
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	98	98	98	98	96	98%
POV shift: 3rd person to 1st person (Elena's perspective) Text Editing	100	100	100	100	100	100	33	90%
Tense rewriting: past to present Text Editing	100	100	100	100	100	100	100	100%
Specific Prompt								97.62%
97.94%

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	0	0	0	70%
Simple Rule Following	100	100	100	100	100	0	0	0	0	0	50%
Simple (1-shot) 1-shot Rule Following	100	100	100	100	100	100	100	100	100	100	100%
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	0	90%
82.00%

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	92	0	89%
20 sentence summary Utility	100	100	100	100	100	100	100	98	77	0	88%
50 sentence summary Utility	100	100	100	100	100	100	100	100	27	0	83%
sentences											91.90%
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	77	0	0	0	68%
200 word summary Utility	100	100	100	100	100	100	100	100	98	0	90%
words											91.51%
93.62%