Aion-2.0
Summary
Aion-2.0 is a proprietary language model from Aion Labs, released on 23 Feb 2026. It accepts text and generates text, with a 131K-token context window and up to 33K output tokens per response. As of 17 Oct 2026, the lowest listed API price is $0.80 per million input tokens and $1.60 per million output tokens (OpenRouter), across 1 provider we track.
Reasoning model for deliberate analysis, multi-step problem solving, and tool use
Last verified 17 Oct 2026. Every figure on this page links to its source.
Specifications
| Developer | Aion Labs |
|---|---|
| Release date | 23 Feb 2026 [models.dev] |
| Status | Generally available [models.dev] |
| Weights | Proprietary (API only) [models.dev] |
| Context window | 131K (131,072 tokens) [models.dev] |
| Max output | 33K tokens [models.dev] |
| Input | Text [models.dev] |
| Output | Text [models.dev] |
| Reasoning mode | Yes [models.dev] |
| Tool calling | Yes [models.dev] |
| Structured output | No [models.dev] |
Aion-2.0 API pricing by provider
USD per million tokens. Sorted by input price.
| Provider | Input | Output | Cached input | Context | Source |
|---|---|---|---|---|---|
| OpenRouter aion-labs/aion-2.0 | $0.80 | $1.60 | $0.20 | 131K | OpenRouter, 17 Oct 2026 |
Frequently asked questions
What is the context window of Aion-2.0?
Aion-2.0 has a context window of 131,072 tokens (131K) and can generate up to 32,768 tokens in a single response, according to models.dev.
How much does the Aion-2.0 API cost?
Aion-2.0 is listed from $0.80 per million input tokens and $1.60 per million output tokens (OpenRouter). Prices last verified 17 Oct 2026.
Is Aion-2.0 open source?
No. Aion-2.0 is a proprietary model; Aion Labs has not released its weights. It is available through APIs including OpenRouter.
When was Aion-2.0 released?
Aion Labs released Aion-2.0 on 23 Feb 2026, according to models.dev.
Change history
- Now listed on OpenRouter
- Added to the directory