Aion 3.5: API pricing, providers and specs
Aion 3.5 is a text model by Aion Labs. 2 providers serve it, from $6 to $6.35 /1M; the lowest price is at OpenRouter.
How Aion 3.5 compares
Against the 737 text models on the site priced the same way.
- Pricey for its class: at $6 /1M, its lowest price is above 79% of comparable models (median $1.10).
- Its 262K-token context window is larger than 45% of them (median 262K), about 390 pages of text.
- 2 providers serve it; 36% of comparable models have fewer.
Aion 3.5 prices by provider
Every provider's list price, read from its own price page or API. A price marked “from” changes with context length, resolution or mode.
| Provider | Input | Output | Prompt caching | Context |
|---|---|---|---|---|
| OpenRouter | $3/1M | From$6/1M | $0.75/1M | 262K |
| AI/ML API | $3.17/1M | $6.35/1M | $0.793/1M | — |
- OpenRouterFrom$6
- AI/ML API$6.35
Specs
- Type
- Text
- Maker
- Aion Labs
- Inputs
- Text
- Outputs
- Text
- Context
- 262K≈ 390 pages of text
- Max output
- 33K
- Capabilities
- Prompt caching, JSON, Reasoning, Tool calling
- Released
- Sep 23, 2026
- License
- proprietary
- Open weights
- No, API only
Alternatives to Aion 3.5
Same kind of model from other makers, at a similar price.
| Model | Lowest price | Context | Arena | Providers |
|---|---|---|---|---|
| Aion 3.5this model | $6/1M | 262K | — | 2 |
 Gemini 4 Argon | $8/1M | 1.05M | 1673 | 26 |
| Kimi K3 | $8.28/1M | 1.05M | 1655 | 47 |
 Muse Wonder | $16/1M | 1.05M | — | 14 |
| Claude Opus 5.5 | $16/1M | 1M | 1807 | 33 |
| GPT-6.1 Sol | $8/1M | 1.05M | 1749 | 27 |
| GPT-6 Sol | $8/1M | 1.05M | 1682 | 28 |
 Qwen3.8 2.4T A95B | $4.11/1M | 1M | — | 22 |
| Grok 4.7 | $4.80/1M | 500K | 1637 | 28 |
More from Aion Labs
Aion 3.5 FAQ
The lowest price for Aion 3.5 is $6 /1M, at OpenRouter.
OpenRouter, at $6 /1M. 2 providers serve Aion 3.5; the table above lists every one with its price.
Aion 3.5 reads up to 262K tokens per request and writes up to 33K.
No. Aion 3.5 is only available through an API; Aion Labs does not publish its weights.
2 API providers serve Aion 3.5. Compare their prices above, or open a provider to see everything it offers.
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