Model comparison
Aion 3.5 vs Claude Sonnet 4.6
Claude Sonnet 4.6 has enough public results to be ranked (#42); Aion 3.5 does not yet, so treat this comparison as directional.
Last verified . 1 shared benchmarks.
Summary
- They share 1 benchmark with published results for both. Aion 3.5 scores higher in 1 category and Claude Sonnet 4.6 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 70.4.
- Aion 3.5 is cheaper at $3 / $6 per million input/output tokens, against $3 / $15 for Claude Sonnet 4.6.
- Claude Sonnet 4.6 accepts more context: 1M tokens versus 262K.
Side by side
| Aion 3.5 | Claude Sonnet 4.6 | |
|---|---|---|
| Provider | AionLabs | Anthropic |
| Noometry Index | 57.9 | 50.1 |
| Released | — | 2026-02-17 |
| Weights | Proprietary | Proprietary |
| Context window | 262K | 1M |
| Max output | 33K | 128K |
| Input $ / M tokens | $3 | $3 |
| Output $ / M tokens | $6 | $15 |
| Results tracked | 1 | 57 |
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Category by category
Coding Not comparable
Aion 3.5: —, Claude Sonnet 4.6: 46.0 (#62)
| Benchmark | Aion 3.5 | Claude Sonnet 4.6 |
|---|---|---|
| SWE-bench Verified | — | 75.2% |
| DeepSWE | — | 29.9% |
| FrontierCode | — | 24.3% |
| LMArena WebDev | — | 1521 |
| SciCode | — | 46.8% |
| WeirdML | — | 66.1% |
| LMArena Coding | — | 1504 |
| ALE-Bench | — | 1,327 |
Agentic & Tool Use Not comparable
Aion 3.5: —, Claude Sonnet 4.6: 39.1 (#26)
| Benchmark | Aion 3.5 | Claude Sonnet 4.6 |
|---|---|---|
| Terminal-Bench | — | 53.4% |
| APEX-Agents | — | 43% |
| OSWorld 2.0 | — | 9.3% |
| DeepResearch Bench | — | 54.9% |
| OSWorld | — | 72.1% |
| ExploitBench | — | 23.6% |
| GBAEval | — | 48.8% |
| GDP.pdf | — | 18% |
| LMArena Search | — | 1221 |
| Vending-Bench 2 | — | 7,204 |
Reasoning Not comparable
Aion 3.5: —, Claude Sonnet 4.6: 46.1 (#40)
| Benchmark | Aion 3.5 | Claude Sonnet 4.6 |
|---|---|---|
| ARC-AGI-2 | — | 60.4% |
| NYT Connections (extended) | — | 80.9% |
| ARC-AGI-1 | — | 86.5% |
| CritPt | — | 3.1% |
| Chess Puzzles | — | 13% |
| Thematic Generalization | — | 76.3% |
| LMArena Hard Prompts | — | 1485 |
| Mystery Game Puzzles | — | 16% |
| DTBench | — | 89.9% |
| LMCA | — | 46.5% |
| Epoch Capabilities Index | — | 152.25 |
| ForecastBench | — | 62 |
Math Not comparable
Aion 3.5: —, Claude Sonnet 4.6: 51.9 (#41)
| Benchmark | Aion 3.5 | Claude Sonnet 4.6 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | — | 85.8% |
| ProofBench | — | 45% |
| LMArena Math | — | 1463 |
| FrontierMath (Feb 2025 set) | — | 32.4% |
| FrontierMath Tier 4 (v1) | — | 8.3% |
Knowledge Not comparable
Aion 3.5: —, Claude Sonnet 4.6: 51.6 (#60)
| Benchmark | Aion 3.5 | Claude Sonnet 4.6 |
|---|---|---|
| GPQA Diamond | — | 87.4% |
| SimpleQA Verified | — | 35.5% |
| Vectara Hallucination Rate | — | 10.6% |
| LMArena Expert | — | 1500 |
Multimodal Not comparable
Aion 3.5: —, Claude Sonnet 4.6: 38.0 (#61)
| Benchmark | Aion 3.5 | Claude Sonnet 4.6 |
|---|---|---|
| LMArena Vision | — | 1283 |
| Blueprint-Bench 2 | — | 6.7% |
| LMArena Document | — | 1482 |
Multilingual Not comparable
Aion 3.5: —, Claude Sonnet 4.6: 54.6 (#39)
| Benchmark | Aion 3.5 | Claude Sonnet 4.6 |
|---|---|---|
| LMArena Non-English | — | 1440 |
| LMArena Chinese | — | 1491 |
| LMArena French | — | 1465 |
| LMArena German | — | 1428 |
| LMArena Japanese | — | 1419 |
| LMArena Korean | — | 1411 |
| LMArena Russian | — | 1440 |
| LMArena Spanish | — | 1465 |
Instruction Following Not comparable
Aion 3.5: —, Claude Sonnet 4.6: 77.6 (#23)
| Benchmark | Aion 3.5 | Claude Sonnet 4.6 |
|---|---|---|
| LMArena Instruction Following | — | 1476 |
Long Context Not comparable
Aion 3.5: —, Claude Sonnet 4.6: 45.3 (#40)
| Benchmark | Aion 3.5 | Claude Sonnet 4.6 |
|---|---|---|
| LMArena Longer Query | — | 1479 |
Writing & Preference Aion 3.5 leads
Aion 3.5: 74.9, Claude Sonnet 4.6: 70.4 (#22)
| Benchmark | Aion 3.5 | Claude Sonnet 4.6 |
|---|---|---|
| EQ-Bench Creative Writing | 1929 | 1810 |
| LMArena Text | — | 1458 |
| LMArena Creative Writing | — | 1435 |
| EQ-Bench 4 | — | 1207 |
| LMArena Multi-Turn | — | 1464 |
Frequently asked questions
Is Aion 3.5 better than Claude Sonnet 4.6?
Claude Sonnet 4.6 has enough public results to be ranked (#42); Aion 3.5 does not yet, so treat this comparison as directional.
Which is cheaper, Aion 3.5 or Claude Sonnet 4.6?
Aion 3.5 is cheaper. It lists at $3 per million input tokens and $6 per million output tokens; Claude Sonnet 4.6 lists at $3 and $15.
Which has the bigger context window?
Claude Sonnet 4.6 does, with 1M tokens against 262K.
How many benchmarks do Aion 3.5 and Claude Sonnet 4.6 share?
1 benchmark has published results for both models. Aion 3.5 has 1 scored results on Noometry and Claude Sonnet 4.6 has 57.