AionLabs: Aion-2.0
Aion-2.0 is a language model from AionLabs released on Feb 23, 2026. It reads text and writes text, with a 131K token context window and up to 33K tokens per reply.
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It costs $0.80 per million input tokens and $1.60 per million output tokens. Cached input bills at $0.20, 75% less than fresh input.
It supports tool calling and prompt caching.
2 providers serve it, including Kilo Gateway and NanoGPT.
- Modalities
- In / out price
- $0.80 / $1.60 per 1M
- Context
- 131K
- Max output
- 33K
- Released
- Feb 23, 2026
- Knowledge cutoff
- n/a
- Tool calling
- Structured output
- Reasoning
- Prompt caching
- Open weights
- Free to use
Aion-2.0 pricing
USD, as listed on Oct 15, 2026. Most bills are input heavy, so the cached input rate matters as much as the headline price.
| Input | $0.80 / 1M tokens | |
|---|---|---|
| Output | $1.60 / 1M tokens | |
| Cached input (read) | $0.20 / 1M tokens | 75% off input |
Aion-2.0 providers
2 providers serve it, including Kilo Gateway and NanoGPT. Each host sets its own price and limits, so the cheapest one is not always the one with the longest context.
| Provider | Input /M | Output /M | Cache read /M | Context | Max output |
|---|---|---|---|---|---|
| Kilo Gateway | $0.80 | $1.60 | $0.20 | 131K | 33K |
| NanoGPT | $0.80 | $1.60 | $0.20 | 131K | 33K |
What Aion-2.0 costs per month
Pick a workload close to yours or type your own volumes.
Supported request parameters
What you can set when you call Aion-2.0 through an OpenAI compatible API.
- Tools
tools - Temperature
temperature
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Aion-2.0 questions
How much does the Aion-2.0 API cost?
$0.80 per million input tokens and $1.60 per million output tokens, with cached input at $0.20. The estimator on this page turns that into a monthly bill for your own workload.
What is the context window of Aion-2.0?
131,072 tokens of input, and it can write up to 32,768 tokens in one reply. As a rough guide, a million tokens is around 750,000 English words.
Which providers serve Aion-2.0?
2 providers serve it, including Kilo Gateway and NanoGPT. Prices differ by host, so the Providers table on this page lists each one with its input and output price.
Does Aion-2.0 support tool calling?
Yes. It accepts tool definitions, which is what an agent needs to call your APIs.
Is Aion-2.0 open source?
No. AionLabs serves it through an API only, so you cannot download the weights or host it yourself.
When was Aion-2.0 released?
Feb 23, 2026.
Catalog data from models.dev (MIT licensed), refreshed daily, last on Oct 15, 2026. The summary is written from these facts.