Model comparison
Aion 3.5 vs Claude Opus 4.7
Claude Opus 4.7 has enough public results to be ranked (#19); 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 4.7 in 1 category, but none of those gaps is larger than the uncertainty.
- Aion 3.5 is cheaper at $3 / $6 per million input/output tokens, against $5 / $25 for Claude Opus 4.7.
- Claude Opus 4.7 accepts more context: 1M tokens versus 262K.
Side by side
| Aion 3.5 | Claude Opus 4.7 | |
|---|---|---|
| Provider | AionLabs | Anthropic |
| Noometry Index | 58.1 | 58.3 |
| Released | — | 2026-04-14 |
| Weights | Proprietary | Proprietary |
| Context window | 262K | 1M |
| Max output | 33K | 128K |
| Input $ / M tokens | $3 | $5 |
| Output $ / M tokens | $6 | $25 |
| Results tracked | 1 | 66 |
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Category by category
Coding Not comparable
Aion 3.5: —, Claude Opus 4.7: 59.6 (#13)
| Benchmark | Aion 3.5 | Claude Opus 4.7 |
|---|---|---|
| SWE-bench Verified | — | 83.5% |
| FrontierCode | — | 38.5% |
| LMArena WebDev | — | 1558 |
| SciCode | — | 54.5% |
| GSO | — | 44.1% |
| WeirdML | — | 76.4% |
| LMArena Coding | — | 1518 |
| MirrorCode | — | 31.1% |
| ALE-Bench | — | 1,323 |
Agentic & Tool Use Not comparable
Aion 3.5: —, Claude Opus 4.7: 47.9 (#10)
| Benchmark | Aion 3.5 | Claude Opus 4.7 |
|---|---|---|
| Terminal-Bench | — | 80.2% |
| APEX-Agents | — | 49.2% |
| OSWorld 2.0 | — | 18.2% |
| τ²-bench Banking | — | 40.2% |
| PostTrainBench | — | 28.6% |
| ExploitBench | — | 26.5% |
| GBAEval | — | 43.8% |
| GDP.pdf | — | 21% |
| LMArena Search | — | 1233 |
| Vending-Bench 2 | — | 10,937 |
Reasoning Not comparable
Aion 3.5: —, Claude Opus 4.7: 53.8 (#29)
| Benchmark | Aion 3.5 | Claude Opus 4.7 |
|---|---|---|
| ARC-AGI-2 | — | 75.8% |
| SimpleBench | — | 61.7% |
| Kagi LLM Benchmark | — | 80.7% |
| NYT Connections (extended) | — | 39% |
| ARC-AGI-1 | — | 93.5% |
| CritPt | — | 12% |
| Chess Puzzles | — | 30% |
| Thematic Generalization | — | 72.8% |
| EBR-Bench | — | 19% |
| LMArena Hard Prompts | — | 1506 |
| Mystery Game Puzzles | — | 28% |
| DTBench | — | 94.7% |
| LMCA | — | 52.2% |
| Epoch Capabilities Index | — | 156.25 |
| ForecastBench | — | 60.3 |
Math Not comparable
Aion 3.5: —, Claude Opus 4.7: 66.7 (#26)
| Benchmark | Aion 3.5 | Claude Opus 4.7 |
|---|---|---|
| FrontierMath (Tiers 1-3) | — | 70.2% |
| FrontierMath Tier 4 | — | 31.7% |
| MathArena Final-Answer Competitions | — | 73.6% |
| OTIS Mock AIME 2024-2025 | — | 97.8% |
| ProofBench | — | 54% |
| LMArena Math | — | 1499 |
| FrontierMath (Feb 2025 set) | — | 43.8% |
| FrontierMath Tier 4 (v1) | — | 22.9% |
Knowledge Not comparable
Aion 3.5: —, Claude Opus 4.7: 62.6 (#23)
| Benchmark | Aion 3.5 | Claude Opus 4.7 |
|---|---|---|
| GPQA Diamond | — | 90.2% |
| Humanity's Last Exam | — | 36.2% |
| SimpleQA Verified | — | 51.7% |
| Vectara Hallucination Rate | — | 12% |
| LMArena Expert | — | 1521 |
Multimodal Not comparable
Aion 3.5: —, Claude Opus 4.7: 41.2 (#38)
| Benchmark | Aion 3.5 | Claude Opus 4.7 |
|---|---|---|
| LMArena Vision | — | 1316 |
| Blueprint-Bench 2 | — | 24.5% |
| Furniture Assembly | — | 33.3% |
| LMArena Document | — | 1495 |
Multilingual Not comparable
Aion 3.5: —, Claude Opus 4.7: 57.3 (#10)
| Benchmark | Aion 3.5 | Claude Opus 4.7 |
|---|---|---|
| LMArena Non-English | — | 1480 |
| LMArena Chinese | — | 1531 |
| LMArena French | — | 1503 |
| LMArena German | — | 1495 |
| LMArena Japanese | — | 1472 |
| LMArena Korean | — | 1464 |
| LMArena Russian | — | 1494 |
| LMArena Spanish | — | 1495 |
Instruction Following Not comparable
Aion 3.5: —, Claude Opus 4.7: 78.4 (#10)
| Benchmark | Aion 3.5 | Claude Opus 4.7 |
|---|---|---|
| LMArena Instruction Following | — | 1498 |
Long Context Not comparable
Aion 3.5: —, Claude Opus 4.7: 46.2 (#25)
| Benchmark | Aion 3.5 | Claude Opus 4.7 |
|---|---|---|
| LMArena Longer Query | — | 1505 |
Writing & Preference Too close to call
Aion 3.5: 74.9, Claude Opus 4.7: 75.1 (#8)
| Benchmark | Aion 3.5 | Claude Opus 4.7 |
|---|---|---|
| EQ-Bench Creative Writing | 1929 | 1914 |
| LMArena Text | — | 1490 |
| LMArena Creative Writing | — | 1486 |
| EQ-Bench 4 | — | 1311 |
| LMArena Multi-Turn | — | 1505 |
Frequently asked questions
Is Aion 3.5 better than Claude Opus 4.7?
Claude Opus 4.7 has enough public results to be ranked (#19); Aion 3.5 does not yet, so treat this comparison as directional.
Which is cheaper, Aion 3.5 or Claude Opus 4.7?
Aion 3.5 is cheaper. It lists at $3 per million input tokens and $6 per million output tokens; Claude Opus 4.7 lists at $5 and $25.
Which has the bigger context window?
Claude Opus 4.7 does, with 1M tokens against 262K.
How many benchmarks do Aion 3.5 and Claude Opus 4.7 share?
1 benchmark has published results for both models. Aion 3.5 has 1 scored results on Noometry and Claude Opus 4.7 has 66.