Aion 3.5 on Aion Labs
Aion Labs API Free API tier
The catch: 20,000 tokens a day covers only a few short chats, and the models are roleplay and storytelling tunes (Aion 2.0 is a DeepSeek V3.2 variant).
| Access | Free API tier |
|---|---|
| Free limits | Paid model ($3.00 in / $6.00 out per 1M tokens) usable on the free tier's daily credit allowance, within 15 requests/min, 20,000 tokens/min and 20,000 tokens/day. |
| Modality | text |
| Credit card | Not required |
| Commercial use | Allowed |
| Trains on your data | No |
| Licence or terms | Aion Labs Terms of Service (current version; a new version takes effect 17 Oct 2026) |
| Context window | 262,144 tokens |
| Model id | aion-labs/aion-3.5 |
| Base URL | https://api.aionlabs.ai/v1 |
| Last checked | 8 Oct 2026 |
How to use Aion 3.5
It speaks the OpenAI API at https://api.aionlabs.ai/v1, so the OpenAI SDK you already use works once you change the base URL and key.
curl https://api.aionlabs.ai/v1/chat/completions -H "Content-Type: application/json" -H "Authorization: Bearer $AION_API_KEY" -d '{"model":"aion-labs/aion-3.5","messages":[{"role":"user","content":"Hello"}]}'I want to use the free AI model "Aion 3.5" from Aion Labs (model id: aion-labs/aion-3.5) in my project. Please: 1. Check the provider docs and give me the exact steps to get a free API key. 2. Give me a minimal working example that reads the key from an environment variable. 3. Tell me the real free limits and any catch (commercial use, card, data use). Listed limits: 15 RPM · 20K tokens/day (free tier). 4. If the same provider has a more generous free option, mention it.
Before you ship on it
- 20,000 tokens a day covers only a few short chats, and the models are roleplay and storytelling tunes (Aion 2.0 is a DeepSeek V3.2 variant).
- Current Terms s5.1 license use 'including in commercial contexts such as building and operating products and services using the Aion Labs API'; reselling raw API access needs written consent. The version taking effect…
- Free tiers are shared capacity: treat the limits as a ceiling, not a promise, and keep a paid fallback.
Questions
Is Aion 3.5 on Aion Labs free?
Yes. Aion Labs offers it as free api tier, with these limits: 15 RPM · 20K tokens/day (free tier). No credit card is needed.
Can I use Aion 3.5 on Aion Labs commercially?
Yes, under Aion Labs Terms of Service (current version; a new version takes effect 17 Oct 2026). Check the current terms before you ship.
How do I start with Aion 3.5 on Aion Labs?
It speaks the OpenAI API at https://api.aionlabs.ai/v1, so the OpenAI SDK you already use works once you change the base URL and key.
Source: aionlabs.ai/docs/models/, checked 8 Oct 2026.