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-5.4 | Advanced | Latest generation with concise, focused answers. |
| GPT-5.1 | Advanced | Strong all-around 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-5.4 mini | Fast | Latest fast model. Tighter, faster answers than GPT-4.1 mini. |
| 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 4.6 | Advanced | Latest generation, strong on reasoning and coding. |
| Claude Sonnet 4.5 | Advanced | Strong reasoning and coding capabilities. |
| 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.
Which model should I pick?
Stick with the default (GPT-4.1 mini) unless you have a reason to switch. It handles most documentation queries well and is available on every plan.
Switch when:
| If you want... | Pick |
|---|---|
| Faster, more concise answers | GPT-5.4 mini or Claude Haiku 4.5 |
| In-depth answers for highly technical content | GPT-5.4 or Claude Sonnet 4.6 |
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.