Aion 3.5 (Reasoning, High)

aion-labs/aion-3.5

Aion 3.5 (Reasoning, High)

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Release Date

Sep 23rd, 2026

Context Size

262k

Reasoning

Yes

Benchmark Cost

$11.61

Speed

43.1 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	89	88	87	84	83	86%
Horror: alone in an eerie place at night Creative Writing Hallucination	92	91	89	86	83	88%
Literary fiction: old friends reunite Creative Writing Hallucination	92	89	88	86	84	88%
Mystery: examining a crime scene Creative Writing Hallucination	93	93	92	92	90	92%
Romance: separated couple reunites Creative Writing Hallucination	93	91	89	89	88	90%
Thriller: chase through city streets Creative Writing Hallucination	91	91	90	89	88	90%
Detailed Writing Rules						88.88%
genre
Fantasy: entering an ancient ruin Creative Writing Hallucination	87	85	83	82	80	83%
Horror: alone in an eerie place at night Creative Writing Hallucination	84	82	76	76	75	79%
Literary fiction: old friends reunite Creative Writing Hallucination	88	85	82	80	76	82%
Mystery: examining a crime scene Creative Writing Hallucination	89	81	81	80	79	82%
Romance: separated couple reunites Creative Writing Hallucination	86	82	81	81	78	82%
Thriller: chase through city streets Creative Writing Hallucination	84	80	79	76	74	78%
genre						81.02%
Novelcrafter Default Prompt
Fantasy: entering an ancient ruin Creative Writing Hallucination	89	88	85	83	81	85%
Horror: alone in an eerie place at night Creative Writing Hallucination	87	86	84	84	79	84%
Literary fiction: old friends reunite Creative Writing Hallucination	87	85	85	82	81	84%
Mystery: examining a crime scene Creative Writing Hallucination	91	88	86	85	83	87%
Romance: separated couple reunites Creative Writing Hallucination	86	84	83	82	78	82%
Thriller: chase through city streets Creative Writing Hallucination	87	86	86	83	82	85%
Novelcrafter Default Prompt						84.57%
84.82%

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	100	99	98	98	96	98%
Medium: The Hollow (Inferred) Tooling Reasoning	98	98	98	97	96	97%
Medium: Through the Thornveil (Scattered) Tooling Reasoning	100	100	99	99	98	99%
Short: The Rusty Lantern (Explicit) Tooling Reasoning	100	100	100	99	99	99%
98.48%

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	17	42%
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											85.42%
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	100	25	93%
Short text (~524 words), big codex (51 detailed entries) Hallucination	100	100	100	100	50	25	25	25	25	25	57%
Short text (~524 words), small codex (11 detailed entries) Hallucination	100	100	100	100	100	25	25	25	25	25	63%
detailed entries											78.13%
81.77%

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	99	99	99	99	99	99	98	96	0	89%
Large codex (40 entries), short passage (165 words) Tooling Reasoning	100	100	100	100	100	98	98	96	96	0	89%
Small codex (7 entries), long passage (734 words) Tooling Reasoning	100	100	100	100	100	100	100	100	100	95	100%
Small codex (7 entries), short passage (165 words) Tooling Reasoning	100	100	100	100	100	100	100	100	100	100	100%
matrix											94.27%
tiers
5 codex entries Tooling Reasoning	100	100	100	100	100	100	100	100	91	0	89%
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	100	100	96	96	92	92	98%
40 codex entries Tooling Reasoning	100	100	100	100	100	100	100	100	100	92	99%
tiers											93.95%
94.11%

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	50	50	50	50	80%
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	50	95%
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	100	100%
Who's the tallest? Reasoning	100	100	100	100	100	100	100	100	100	100	100%
97.73%

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	97	96	91	89	80	72	71	50	48	79%
Write 200 words with 50% dialogue Rule Following Utility	99	93	61	50	50	50	50	49	47	2	55%
Write 200 words with 90% dialogue Rule Following Utility	100	98	97	94	93	91	64	64	50	32	78%
dialogue-200											70.87%
dialogue-500
Write 500 words with 30% dialogue Rule Following Utility	96	94	85	48	11	11	3	0	0	0	35%
Write 500 words with 50% dialogue Rule Following Utility	49	48	45	45	26	6	1	0	0	0	22%
Write 500 words with 70% dialogue Rule Following Utility	12	2	1	0	0	0	0	0	0	0	2%
dialogue-500											19.43%
Ungrouped
Write unattributed dialogue Rule Following	100	100	100	100	100	100	100	100	100	100	100%
52.99%

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	95	99%
Character dialogue (Hindi) in a story Language	100	100	100	100	100	100%
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%
99.81%

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	98	92	86	98%
Write sentences with 10 words each Utility	100	100	100	100	100	100	100	100	100	93	99%
Write sentences with 20 words each Utility	100	100	100	100	100	100	100	100	100	100	100%
98.96%

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	100	100%
outline-count											100.00%
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	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											100.00%
100.00%

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	87	86	73	89%
Family relationship tree Tooling Reasoning Hallucination	85	83	82	79	46	75%
82.01%

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	58	94%
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	98	98	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	99	98	98	98	98	97	97	98%
POV shift: 3rd person to 1st person (Elena's perspective) Text Editing	100	100	100	100	100	99	99	100%
Tense rewriting: past to present Text Editing	100	100	99	99	99	99	97	99%
Generic Prompt								98.75%
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	95	95	99%
Combined: 3rd person past → 1st person present Text Editing	100	100	100	100	100	100	99	100%
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	99	99	99	98	98	98	98	99%
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								99.67%
99.21%

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	100	100	100	0	0	80%
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	100	100	100%
Unattributed dialogue Rule Following	100	100	100	100	100	100	100	100	100	100	100%
88.00%

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	0	90%
paragraphs											96.67%
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	100	100	100%
50 sentence summary Utility	100	100	100	100	100	100	100	100	100	100	100%
sentences											99.99%
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	100	100	100	100	100%
200 word summary Utility	100	100	100	100	100	100	100	100	100	9	91%
words											98.18%
98.52%