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What is OpenRouter used for in a Bolna voice agent?
OpenRouter lets a Bolna voice agent use models from OpenAI, Anthropic, Google, Mistral, Meta and DeepSeek through one API key, by setting the agent's LLM to an OpenRouter model slug such as openai/gpt-4o-mini. Pick it when you want to compare several models, keep a fallback ready, or avoid managing a separate account with each provider.
How do I set up OpenRouter with Bolna?
- Create an API key at openrouter.ai.
- Add it to your Bolna account at platform.bolna.ai/auth/openrouter.
- Open your agent's Intelligence tab, choose OpenRouter as the provider and pick a model. OpenRouter models use
provider/model-nameslugs. - Keep the token limit around 150 and the temperature around 0.2 so replies stay short and consistent on a call.
The OpenRouter setup guide in the Bolna docs lists every setting and a JSON config you can paste into the API.
Which OpenRouter models does Bolna recommend for voice?
| Model slug | Context | Best for |
|---|---|---|
openai/gpt-4o-mini | 128K | Best OpenAI balance through OpenRouter |
openai/gpt-4o | 128K | Higher-quality OpenAI |
anthropic/claude-haiku-4.5 | 200K | Fast, cost-efficient Claude |
anthropic/claude-sonnet-4.1 | 200K | Higher-quality Claude |
google/gemini-3-flash | 1M | Fast Gemini with good multilingual support |
google/gemini-3-flash-lite | 1M | Cheapest large-context option |
mistralai/mistral-small | 32K | Fast, low-cost European option |
meta-llama/llama-3.1-70b | 128K | Open-weight, cost-effective |
deepseek/deepseek-chat | 1M | Very low cost |
The full catalogue is at openrouter.ai/models.
What can you build with OpenRouter and Bolna?
Model comparisons. Run the same agent on different slugs to see which model gives the best mix of cost, speed and quality for your calls.
Agents with a fallback model. Configure fallback routing in OpenRouter so a support line has a second model ready if the primary provider is unavailable.
Multilingual agents. Use google/gemini-3-flash for agents that need to speak Hindi or other Indian languages.
Teams without provider accounts. Reach Claude, Gemini, Llama and Mistral through one key instead of signing up with each vendor. If you later need a direct connection, see the Anthropic integration.