# Aion 3.5 vs Claude Sonnet 5.5

> Claude Sonnet 5.5 has enough public results to be ranked (#10); Aion 3.5 does not yet, so treat this comparison as directional.

- Canonical page: https://noometry.com/compare/aion-3-5-vs-claude-sonnet-5-5
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- Aion 3.5 is cheaper at $3 / $6 per million input/output tokens, against $2 / $10 for Claude Sonnet 5.5.
- Claude Sonnet 5.5 accepts more context: 1M tokens versus 262K.

## Snapshot

| | Aion 3.5 | Claude Sonnet 5.5 |
|---|---|---|
| Provider | AionLabs | Anthropic |
| Noometry Index | 57.9 | 60.5 |
| Rank | — | 10 |
| Context | 262K | 1M |
| Input $/M | $3 | $2 |
| Output $/M | $6 | $10 |
| Weights | Proprietary | Proprietary |

## Coding

- Aion 3.5: —
- Claude Sonnet 5.5: 65.5 (#6)

| Benchmark | Aion 3.5 | Claude Sonnet 5.5 |
|---|---|---|
| FrontierCode | — | 52.1% |
| CursorBench | — | 55.5% |
| LMArena WebDev | — | 1699 |
| FrontierSWE | — | 61.9% |
| SciCode | — | 61% |
| ALE-Bench | — | 1,819 |

## Agentic & Tool Use

- Aion 3.5: —
- Claude Sonnet 5.5: 44.9 (#14)

| Benchmark | Aion 3.5 | Claude Sonnet 5.5 |
|---|---|---|
| APEX-Agents | — | 75.5% |

## Reasoning

- Aion 3.5: —
- Claude Sonnet 5.5: 52.4 (#29)

| Benchmark | Aion 3.5 | Claude Sonnet 5.5 |
|---|---|---|
| CritPt | — | 31.4% |
| Mystery Game Puzzles | — | 65% |

## Math

- Aion 3.5: —
- Claude Sonnet 5.5: 88.7 (#4)

| Benchmark | Aion 3.5 | Claude Sonnet 5.5 |
|---|---|---|
| FrontierMath (Tiers 1-3) | — | 88.8% |
| FrontierMath Tier 4 | — | 80.5% |
| OTIS Mock AIME 2024-2025 | — | 100% |
| ProofBench | — | 100% |

## Knowledge

- Aion 3.5: —
- Claude Sonnet 5.5: 66.0 (#11)

| Benchmark | Aion 3.5 | Claude Sonnet 5.5 |
|---|---|---|
| GPQA Diamond | — | 95.6% |
| SimpleQA Verified | — | 46.5% |

## Multimodal

- Aion 3.5: —
- Claude Sonnet 5.5: 53.2 (#5)

| Benchmark | Aion 3.5 | Claude Sonnet 5.5 |
|---|---|---|
| Furniture Assembly | — | 75% |

## Writing & Preference

- Aion 3.5: 74.9
- Claude Sonnet 5.5: —

| Benchmark | Aion 3.5 | Claude Sonnet 5.5 |
|---|---|---|
| EQ-Bench Creative Writing | 1929 | — |

## FAQ

### Is Aion 3.5 better than Claude Sonnet 5.5?

Claude Sonnet 5.5 has enough public results to be ranked (#10); Aion 3.5 does not yet, so treat this comparison as directional.

### Which is cheaper, Aion 3.5 or Claude Sonnet 5.5?

Aion 3.5 is cheaper. It lists at $3 per million input tokens and $6 per million output tokens; Claude Sonnet 5.5 lists at $2 and $10.

### Which has the bigger context window?

Claude Sonnet 5.5 does, with 1M tokens against 262K.

### How many benchmarks do Aion 3.5 and Claude Sonnet 5.5 share?

0 benchmarks have published results for both models. Aion 3.5 has 1 scored results on Noometry and Claude Sonnet 5.5 has 16.