Model comparison

Aion 3.5 vs DeepSeek V4 Flash

DeepSeek V4 Flash has enough public results to be ranked (#35); Aion 3.5 does not yet, so treat this comparison as directional.

Last verified October 12, 2026. 1 shared benchmarks.

Aion 3.5 AionLabs

58.1

Unranked Sparse

DeepSeek V4 Flash

DeepSeek

53.6

Rank #35 Confirmed

Summary

They share 1 benchmark with published results for both. Aion 3.5 scores higher in 1 category and DeepSeek V4 Flash in 0 categories; one gap is clear of the uncertainty.
The widest gap is in writing & preference, where Aion 3.5 leads 74.9 to 63.8.
DeepSeek V4 Flash is cheaper at $0.15 / $0.60 per million input/output tokens, against $3 / $6 for Aion 3.5.
DeepSeek V4 Flash accepts more context: 1M tokens versus 262K.
DeepSeek V4 Flash has downloadable open weights; the other is API-only.

Side by side

Aion 3.5 and DeepSeek V4 Flash specifications
	Aion 3.5	DeepSeek V4 Flash
Provider	AionLabs	DeepSeek
Noometry Index	58.1	53.6
Released	—	2026-04-24
Weights	Proprietary	Open
Context window	262K	1M
Max output	33K	393K
Input $ / M tokens	$3	$0.15
Output $ / M tokens	$6	$0.60
Results tracked	1	41

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Category by category

Coding Not comparable

Aion 3.5: —, DeepSeek V4 Flash: 47.9 (#59)

Coding benchmarks
Benchmark	Aion 3.5	DeepSeek V4 Flash
FrontierCode	—	18.8%
LMArena WebDev	—	1582
SciCode	—	49.9%
WeirdML	—	63%
LMArena Coding	—	1457
ALE-Bench	—	1,306

Reasoning Not comparable

Aion 3.5: —, DeepSeek V4 Flash: 53.7 (#30)

Reasoning benchmarks
Benchmark	Aion 3.5	DeepSeek V4 Flash
ARC-AGI-2	—	61.4%
SimpleBench	—	61.1%
Kagi LLM Benchmark	—	52.2%
NYT Connections (extended)	—	89.6%
ARC-AGI-1	—	89%
CritPt	—	16.6%
Chess Puzzles	—	33%
LMArena Hard Prompts	—	1444
Mystery Game Puzzles	—	34%
DTBench	—	90.9%
LMCA	—	41.7%
Epoch Capabilities Index	—	154.49

Math Not comparable

Aion 3.5: —, DeepSeek V4 Flash: 60.3 (#37)

Math benchmarks
Benchmark	Aion 3.5	DeepSeek V4 Flash
FrontierMath (Tiers 1-3)	—	57.5%
FrontierMath Tier 4	—	24.4%
MathArena Final-Answer Competitions	—	76.5%
OTIS Mock AIME 2024-2025	—	94.4%
ProofBench	—	56%
LMArena Math	—	1427

Knowledge Not comparable

Aion 3.5: —, DeepSeek V4 Flash: 55.4 (#48)

Knowledge benchmarks
Benchmark	Aion 3.5	DeepSeek V4 Flash
GPQA Diamond	—	91%
SimpleQA Verified	—	33.6%
LMArena Expert	—	1441

Multilingual Not comparable

Aion 3.5: —, DeepSeek V4 Flash: 53.0 (#72)

Multilingual benchmarks
Benchmark	Aion 3.5	DeepSeek V4 Flash
LMArena Non-English	—	1420
LMArena Chinese	—	1468
LMArena French	—	1439
LMArena German	—	1418
LMArena Japanese	—	1406
LMArena Korean	—	1384
LMArena Russian	—	1428
LMArena Spanish	—	1436

Instruction Following Not comparable

Aion 3.5: —, DeepSeek V4 Flash: 74.9 (#81)

Instruction Following benchmarks
Benchmark	Aion 3.5	DeepSeek V4 Flash
LMArena Instruction Following	—	1421

Long Context Not comparable

Aion 3.5: —, DeepSeek V4 Flash: 43.8 (#85)

Long Context benchmarks
Benchmark	Aion 3.5	DeepSeek V4 Flash
LMArena Longer Query	—	1434

Writing & Preference Aion 3.5 leads

Aion 3.5: 74.9, DeepSeek V4 Flash: 63.8 (#61)

Writing & Preference benchmarks
Benchmark	Aion 3.5	DeepSeek V4 Flash
EQ-Bench Creative Writing	1929	1559
LMArena Text	—	1432
LMArena Creative Writing	—	1403
LMArena Multi-Turn	—	1449

Frequently asked questions

Is Aion 3.5 better than DeepSeek V4 Flash?

DeepSeek V4 Flash has enough public results to be ranked (#35); Aion 3.5 does not yet, so treat this comparison as directional.

Which is cheaper, Aion 3.5 or DeepSeek V4 Flash?

DeepSeek V4 Flash is cheaper. It lists at $0.15 per million input tokens and $0.60 per million output tokens; Aion 3.5 lists at $3 and $6.

Which has the bigger context window?

DeepSeek V4 Flash does, with 1M tokens against 262K.

How many benchmarks do Aion 3.5 and DeepSeek V4 Flash share?

1 benchmark has published results for both models. Aion 3.5 has 1 scored results on Noometry and DeepSeek V4 Flash has 41.