Models
Biel.ai supports models from OpenAI and Anthropic. Fast models are available on all plans; advanced models require a Business plan or above.
Available models
OpenAI
| Model | Tier | Notes |
|---|---|---|
| GPT-5.1 | Advanced | Latest generation with enhanced performance. |
| GPT-5 | Advanced | Unified reasoning, multimodal support. |
| GPT-4.1 | Advanced | Strong on detailed and complex queries. |
| GPT-4o | Advanced | Strong on detailed and complex queries. |
| GPT-5 Mini | Fast | Improved capabilities over GPT-4o mini. |
| GPT-4.1 mini (default) | Fast | Good balance of speed and quality. |
| GPT-4o mini | Fast | Optimized for speed. |
Anthropic
| Model | Tier | Notes |
|---|---|---|
| Claude Sonnet 4.5 | Advanced | Latest generation, strong on reasoning and coding. |
| Claude Sonnet 4.0 | Advanced | Optimized for complex problem-solving. |
| Claude Sonnet 3.7 | Advanced | Nuanced, context-rich answers. |
| Claude Haiku 4.5 | Fast | Improved accuracy over Haiku 3.5. |
| Claude Haiku 3.5 | Fast | Fast and effective for general documentation. |
Fast models work well for high-traffic sites and straightforward queries. Advanced models are better for highly technical content and detailed queries.
Change the model
important
Only Administrator or Maintainer roles can manage projects. See Manage roles.
- In the Biel.ai dashboard, select your project.
- Click Settings.
- Under LLM settings > Select model, choose a model from the dropdown.
- Click Save.
Data privacy
Chatbot interactions are opted out of third-party model training by default. Your data is not used to train or improve external AI models.