# Aion 3.5 vs DeepSeek V4 Pro

> DeepSeek V4 Pro has enough public results to be ranked (#31); Aion 3.5 does not yet, so treat this comparison as directional.

- Canonical page: https://noometry.com/compare/aion-3-5-vs-deepseek-v4-pro
- Last updated: 2026-10-10
- Shared benchmarks: 1

## Summary

- They share 1 benchmark with published results for both. Aion 3.5 scores higher in 1 category and DeepSeek V4 Pro 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 65.5.
- DeepSeek V4 Pro is cheaper at $0.66 / $1.98 per million input/output tokens, against $3 / $6 for Aion 3.5.
- DeepSeek V4 Pro accepts more context: 1M tokens versus 262K.
- DeepSeek V4 Pro has downloadable open weights; the other is API-only.

## Snapshot

| | Aion 3.5 | DeepSeek V4 Pro |
|---|---|---|
| Provider | AionLabs | DeepSeek |
| Noometry Index | 58.1 | 54.3 |
| Rank | — | 31 |
| Context | 262K | 1M |
| Input $/M | $3 | $0.66 |
| Output $/M | $6 | $1.98 |
| Weights | Proprietary | Open |

## Coding

- Aion 3.5: —
- DeepSeek V4 Pro: 52.4 (#34)

| Benchmark | Aion 3.5 | DeepSeek V4 Pro |
|---|---|---|
| SWE-bench Verified | — | 77.6% |
| FrontierCode | — | 28.6% |
| LMArena WebDev | — | 1582 |
| SciCode | — | 51% |
| WeirdML | — | 66.2% |
| LMArena Coding | — | 1470 |
| ALE-Bench | — | 1,403 |

## Agentic & Tool Use

- Aion 3.5: —
- DeepSeek V4 Pro: 32.8 (#58)

| Benchmark | Aion 3.5 | DeepSeek V4 Pro |
|---|---|---|
| APEX-Agents | — | 47.3% |
| Vending-Bench 2 | — | 3,285 |

## Reasoning

- Aion 3.5: —
- DeepSeek V4 Pro: 56.5 (#24)

| Benchmark | Aion 3.5 | DeepSeek V4 Pro |
|---|---|---|
| ARC-AGI-2 | — | 61.3% |
| Kagi LLM Benchmark | — | 53.5% |
| NYT Connections (extended) | — | 91.3% |
| ARC-AGI-1 | — | 90.5% |
| CritPt | — | 18% |
| Chess Puzzles | — | 47% |
| LMArena Hard Prompts | — | 1461 |
| Mystery Game Puzzles | — | 43% |
| DTBench | — | 93.9% |
| LMCA | — | 45.5% |
| Surface Evolver Bench | — | 40% |
| Epoch Capabilities Index | — | 155.31 |
| ForecastBench | — | 56.1 |

## Math

- Aion 3.5: —
- DeepSeek V4 Pro: 64.8 (#30)

| Benchmark | Aion 3.5 | DeepSeek V4 Pro |
|---|---|---|
| FrontierMath (Tiers 1-3) | — | 64.6% |
| FrontierMath Tier 4 | — | 26.8% |
| MathArena Final-Answer Competitions | — | 76.6% |
| OTIS Mock AIME 2024-2025 | — | 98.6% |
| ProofBench | — | 50% |
| LMArena Math | — | 1455 |

## Knowledge

- Aion 3.5: —
- DeepSeek V4 Pro: 59.5 (#31)

| Benchmark | Aion 3.5 | DeepSeek V4 Pro |
|---|---|---|
| GPQA Diamond | — | 91.7% |
| SimpleQA Verified | — | 52.9% |
| Vectara Hallucination Rate | — | 8.6% |
| LMArena Expert | — | 1464 |

## Multilingual

- Aion 3.5: —
- DeepSeek V4 Pro: 54.4 (#45)

| Benchmark | Aion 3.5 | DeepSeek V4 Pro |
|---|---|---|
| LMArena Non-English | — | 1439 |
| LMArena Chinese | — | 1486 |
| LMArena French | — | 1472 |
| LMArena German | — | 1458 |
| LMArena Japanese | — | 1445 |
| LMArena Korean | — | 1447 |
| LMArena Russian | — | 1453 |
| LMArena Spanish | — | 1458 |

## Instruction Following

- Aion 3.5: —
- DeepSeek V4 Pro: 76.1 (#47)

| Benchmark | Aion 3.5 | DeepSeek V4 Pro |
|---|---|---|
| LMArena Instruction Following | — | 1448 |

## Long Context

- Aion 3.5: —
- DeepSeek V4 Pro: 45.0 (#51)

| Benchmark | Aion 3.5 | DeepSeek V4 Pro |
|---|---|---|
| CL-bench Life | — | 13.5% |
| LMArena Longer Query | — | 1458 |

## Writing & Preference

- Aion 3.5: 74.9
- DeepSeek V4 Pro: 65.5 (#46)

| Benchmark | Aion 3.5 | DeepSeek V4 Pro |
|---|---|---|
| EQ-Bench Creative Writing | 1929 | 1553 |
| LMArena Text | — | 1451 |
| LMArena Creative Writing | — | 1446 |
| EQ-Bench 4 | — | 1166 |
| LMArena Multi-Turn | — | 1467 |

## FAQ

### Is Aion 3.5 better than DeepSeek V4 Pro?

DeepSeek V4 Pro has enough public results to be ranked (#31); Aion 3.5 does not yet, so treat this comparison as directional.

### Which is cheaper, Aion 3.5 or DeepSeek V4 Pro?

DeepSeek V4 Pro is cheaper. It lists at $0.66 per million input tokens and $1.98 per million output tokens; Aion 3.5 lists at $3 and $6.

### Which has the bigger context window?

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

### How many benchmarks do Aion 3.5 and DeepSeek V4 Pro share?

1 benchmark has published results for both models. Aion 3.5 has 1 scored results on Noometry and DeepSeek V4 Pro has 48.