Model comparison
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.
Last verified . 0 shared benchmarks.
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.
Side by side
| Aion 3.5 | Claude Sonnet 5.5 | |
|---|---|---|
| Provider | AionLabs | Anthropic |
| Noometry Index | 57.9 | 60.5 |
| Released | — | 2026-09-28 |
| Weights | Proprietary | Proprietary |
| Context window | 262K | 1M |
| Max output | 33K | 128K |
| Input $ / M tokens | $3 | $2 |
| Output $ / M tokens | $6 | $10 |
| Results tracked | 1 | 16 |
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Category by category
Coding Not comparable
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 Not comparable
Aion 3.5: —, Claude Sonnet 5.5: 44.9 (#14)
| Benchmark | Aion 3.5 | Claude Sonnet 5.5 |
|---|---|---|
| APEX-Agents | — | 75.5% |
Reasoning Not comparable
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 Not comparable
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 Not comparable
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 Not comparable
Aion 3.5: —, Claude Sonnet 5.5: 53.2 (#5)
| Benchmark | Aion 3.5 | Claude Sonnet 5.5 |
|---|---|---|
| Furniture Assembly | — | 75% |
Writing & Preference Not comparable
Aion 3.5: 74.9, Claude Sonnet 5.5: —
| Benchmark | Aion 3.5 | Claude Sonnet 5.5 |
|---|---|---|
| EQ-Bench Creative Writing | 1929 | — |
Frequently asked questions
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.