Input
$3
Output
$6
Context
256K
Aion 3.5 costs $3 per million input tokens and $6 per million output tokens. Cached input is billed at $0.75 per million, 75% less than fresh input.
Specifications
| Lab | AionLabs |
| Model id | aion-labs/aion-3.5 |
| Input price | $3 per million tokens |
| Output price | $6 per million tokens |
| Cached input price | $0.75 per million tokens |
| Context window | 262,144 tokens (256K) |
| Maximum output | 32,768 tokens (32K) |
| Tool calling | yes |
| Image input | no |
| Reasoning | yes |
| First listed | 23 September 2026 |
AionLabs's other models
| Model | Input / 1M | Output / 1M | Context | Listed |
|---|---|---|---|---|
| Aion 3.5 Mini | $0.70 | $1.40 | 256K | 23 September 2026 |
| Aion-3.0 | $3 | $6 | 128K | 7 July 2026 |
| Aion-3.0-Mini | $0.70 | $1.40 | 128K | 7 July 2026 |
| Aion-2.0 | $0.80 | $1.60 | 128K | 23 February 2026 |
| Aion-RP 1.0 (8B) | $0.80 | $1.60 | 32K | 4 February 2025 |
Where these numbers come from
Read from OpenRouter's listing of Aion 3.5 every 6 hours into the catalog Founden's builders choose their models from. Prices are OpenRouter's listed price per million tokens: for a lab's closed models that is the lab's own list price, and for an open-weight model it is the price of the host OpenRouter routes to by default, which can differ from the lab's own API and from other hosts. US dollars, before batch, volume or regional discounts. Every model.