Model comparison
Aion 3.5 vs Claude Opus 5
Claude Opus 5 has enough public results to be ranked (#4); 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 0 categories and Claude Opus 5 in 1 category; one gap is clear of the uncertainty.
- The widest gap is in writing & preference, where Claude Opus 5 leads 79.2 to 74.9.
- Aion 3.5 is cheaper at $3 / $6 per million input/output tokens, against $5 / $25 for Claude Opus 5.
- Claude Opus 5 accepts more context: 1M tokens versus 262K.
Side by side
| Aion 3.5 | Claude Opus 5 | |
|---|---|---|
| Provider | AionLabs | Anthropic |
| Noometry Index | 58.1 | 67.8 |
| Released | — | 2026-07-24 |
| Weights | Proprietary | Proprietary |
| Context window | 262K | 1M |
| Max output | 33K | 128K |
| Input $ / M tokens | $3 | $5 |
| Output $ / M tokens | $6 | $25 |
| Results tracked | 1 | 57 |
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Category by category
Coding Not comparable
Aion 3.5: —, Claude Opus 5: 67.5 (#5)
| Benchmark | Aion 3.5 | Claude Opus 5 |
|---|---|---|
| DeepSWE | — | 73.6% |
| FrontierCode | — | 53.4% |
| CursorBench | — | 46.6% |
| LMArena WebDev | — | 1691 |
| FrontierSWE | — | 52% |
| SciCode | — | 56.4% |
| WeirdML | — | 91.8% |
| LMArena Coding | — | 1534 |
| ALE-Bench | — | 2,165 |
Agentic & Tool Use Not comparable
Aion 3.5: —, Claude Opus 5: 55.6 (#1)
| Benchmark | Aion 3.5 | Claude Opus 5 |
|---|---|---|
| APEX-Agents | — | 65.8% |
| OSWorld 2.0 | — | 31.4% |
| τ²-bench Banking | — | 48.7% |
| PostTrainBench | — | 35% |
| BALROG | — | 63.4% |
| GBAEval | — | 79.6% |
| GDP.pdf | — | 24% |
| Vending-Bench 2 | — | 11,182 |
Reasoning Not comparable
Aion 3.5: —, Claude Opus 5: 77.2 (#4)
| Benchmark | Aion 3.5 | Claude Opus 5 |
|---|---|---|
| ARC-AGI-2 | — | 90.4% |
| SimpleBench | — | 80.6% |
| NYT Connections (extended) | — | 94.3% |
| ARC-AGI-1 | — | 97.5% |
| CritPt | — | 29.1% |
| Chess Puzzles | — | 42% |
| EBR-Bench | — | 45.7% |
| LMArena Hard Prompts | — | 1526 |
| Mystery Game Puzzles | — | 59% |
| DTBench | — | 97.9% |
| LMCA | — | 64.5% |
| Bench to the Future 3 | — | 0.12 |
| Epoch Capabilities Index | — | 162.78 |
Math Not comparable
Aion 3.5: —, Claude Opus 5: 86.2 (#8)
| Benchmark | Aion 3.5 | Claude Opus 5 |
|---|---|---|
| FrontierMath (Tiers 1-3) | — | 85.6% |
| FrontierMath Tier 4 | — | 73.2% |
| OTIS Mock AIME 2024-2025 | — | 98.9% |
| ProofBench | — | 99% |
| LMArena Math | — | 1531 |
Knowledge Not comparable
Aion 3.5: —, Claude Opus 5: 66.8 (#9)
| Benchmark | Aion 3.5 | Claude Opus 5 |
|---|---|---|
| GPQA Diamond | — | 93.9% |
| SimpleQA Verified | — | 59.9% |
| LMArena Expert | — | 1557 |
Multimodal Not comparable
Aion 3.5: —, Claude Opus 5: 50.8 (#8)
| Benchmark | Aion 3.5 | Claude Opus 5 |
|---|---|---|
| LMArena Vision | — | 1319 |
| Blueprint-Bench 2 | — | 30.4% |
| Furniture Assembly | — | 60.8% |
| LMArena Document | — | 1516 |
Multilingual Not comparable
Aion 3.5: —, Claude Opus 5: 58.8 (#4)
| Benchmark | Aion 3.5 | Claude Opus 5 |
|---|---|---|
| LMArena Non-English | — | 1501 |
| LMArena Chinese | — | 1574 |
| LMArena French | — | 1519 |
| LMArena German | — | 1524 |
| LMArena Japanese | — | 1516 |
| LMArena Korean | — | 1521 |
| LMArena Russian | — | 1507 |
| LMArena Spanish | — | 1519 |
Instruction Following Not comparable
Aion 3.5: —, Claude Opus 5: 79.2 (#7)
| Benchmark | Aion 3.5 | Claude Opus 5 |
|---|---|---|
| LMArena Instruction Following | — | 1517 |
Long Context Not comparable
Aion 3.5: —, Claude Opus 5: 46.5 (#21)
| Benchmark | Aion 3.5 | Claude Opus 5 |
|---|---|---|
| LMArena Longer Query | — | 1515 |
Writing & Preference Claude Opus 5 leads
Aion 3.5: 74.9, Claude Opus 5: 79.2 (#1)
| Benchmark | Aion 3.5 | Claude Opus 5 |
|---|---|---|
| EQ-Bench Creative Writing | 1929 | 2133 |
| LMArena Text | — | 1507 |
| LMArena Creative Writing | — | 1491 |
| EQ-Bench 4 | — | 1385 |
| LMArena Multi-Turn | — | 1499 |
Frequently asked questions
Is Aion 3.5 better than Claude Opus 5?
Claude Opus 5 has enough public results to be ranked (#4); Aion 3.5 does not yet, so treat this comparison as directional.
Which is cheaper, Aion 3.5 or Claude Opus 5?
Aion 3.5 is cheaper. It lists at $3 per million input tokens and $6 per million output tokens; Claude Opus 5 lists at $5 and $25.
Which has the bigger context window?
Claude Opus 5 does, with 1M tokens against 262K.
How many benchmarks do Aion 3.5 and Claude Opus 5 share?
1 benchmark has published results for both models. Aion 3.5 has 1 scored results on Noometry and Claude Opus 5 has 57.