Aion 3.5
Summary
Aion 3.5 is a language model from Aion Labs, released on 23 Sept 2026. It accepts text and generates text, with a 262K-token context window and up to 33K output tokens per response. As of 4 Oct 2026, the lowest listed API price is $3 per million input tokens and $6 per million output tokens (OpenRouter), across 1 provider we track.
Aion 3.5 is a multi-model roleplaying and storytelling system from AionLabs, built on the GLM family of models. It uses a collaborative generation process in which multiple specialized models each...
Last verified 4 Oct 2026. Every figure on this page links to its source.
Specifications
| Developer | Aion Labs |
|---|---|
| Release date | 23 Sept 2026 [OpenRouter] |
| Status | Generally available |
| Context window | 262K (262,144 tokens) [OpenRouter] |
| Max output | 33K tokens [OpenRouter] |
| Input | Text [OpenRouter] |
| Output | Text [OpenRouter] |
| Reasoning mode | Yes [OpenRouter] |
| Tool calling | Yes [OpenRouter] |
| Structured output | No [OpenRouter] |
Aion 3.5 API pricing by provider
USD per million tokens. Sorted by input price.
| Provider | Input | Output | Cached input | Context | Source |
|---|---|---|---|---|---|
| OpenRouter aion-labs/aion-3.5 | $3 | $6 | $0.75 | 262K | OpenRouter, 4 Oct 2026 |
Frequently asked questions
What is the context window of Aion 3.5?
Aion 3.5 has a context window of 262,144 tokens (262K) and can generate up to 32,768 tokens in a single response, according to OpenRouter.
How much does the Aion 3.5 API cost?
Aion 3.5 is listed from $3 per million input tokens and $6 per million output tokens (OpenRouter). Prices last verified 4 Oct 2026.
When was Aion 3.5 released?
Aion Labs released Aion 3.5 on 23 Sept 2026, according to OpenRouter.
Change history
No changes detected since we started tracking this model. We re-check every source daily.