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Aion 3.5 vs Claude Fable 5
Aion 3.5 (AionLabs) and Claude Fable 5 (Anthropic) compared on benchmarks, pricing, context window, and use-case rankings.
- Aion 3.5 is cheaper on input tokens — $3.00 vs $10.00 per 1M.
- Claude Fable 5 has a larger context window (1M vs 262K tokens).
| Attribute | Aion 3.5 | Claude Fable 5 |
|---|---|---|
| Scores | ||
| Intelligence (ECI) | — | 163 |
| Coding | — | 96 |
| Math | — | 96 |
| Reasoning & Knowledge | — | 89 |
| Agentic & Tools | — | 94 |
| Specifications | ||
| Developer | AionLabs | Anthropic |
| Family | — | Claude |
| Released | Sep 23, 2026 | Jun 9, 2026 |
| Parameters | — | — |
| Availability | — | API access |
| Context window | 262K | 1M |
| Price — $/M input | $3.00 | $10.00 |
| Price — $/M output | $6.00 | $50.00 |
| Inputs | text | text, image, file |
| Outputs | text | text |
| Benchmarks | ||
| AIME 2024/2025 | — | 100% |
| APEX | — | 64% |
| ARC-AGI | — | 99% |
| ARC-AGI-2 | — | 89% |
| GPQA Diamond | — | 86% |
| Humanity's Last Exam | — | 56% |
| SciCode | — | 61% |
| SimpleBench | — | 82% |
| SimpleQA Verified | — | 71% |
| WebDev Arena | — | 1628 |
| WeirdML | — | 92% |
| τ²-bench | — | 99% |
Use-case scores are 0–100 percentile composites across each area’s benchmarks, ranked against every model from the past year. Highlighted cells lead each row. Open a model for the full picture.
Frequently asked questions
Which is cheaper, Aion 3.5 or Claude Fable 5?
Aion 3.5 is cheaper on input tokens at $3.00 per million, versus $10.00 (representative OpenRouter pricing).
Which has a larger context window, Aion 3.5 or Claude Fable 5?
Claude Fable 5 supports up to 1M tokens, compared with 262K for the other.
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Benchmarks & model data from Epoch AI (CC BY); pricing & specs from OpenRouter. ECI = Epoch Capabilities Index.