LLM
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OpenRouter

Access Claude, Mistral, LLaMA, and dozens of other models through one OpenRouter API key on Bolna. Switch models anytime without reconfiguring your agents.

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At a glance

How OpenRouter fits in the stack

Best for

Reasoning, policy handling, tool use, and response generation.

Use this layer when

You want to tune quality, cost, latency, or function-calling behavior.

Connects to

Transcribed caller input upstream and voice or actions downstream.

Voice Stack

The LLM is the reasoning layer

The LLM is the reasoning layer

This provider decides how the agent interprets intent, selects next actions, calls tools, and formulates responses. It is the decision engine inside the voice stack.

TelephonyPhone Network
STTListener
LLMReasoning
TTSVoice
ToolsActions

This page focuses on where OpenRouter fits in a production voice stack. For full setup steps, credentials, and API details, use the documentation link above.

Overview

OpenRouter provides unified access to many of leading language models through a single API interface. With Bolna's OpenRouter integration, you can access Claude, GPT-4, Mistral, LLaMA, and many other models without managing multiple API keys or integrations.

OpenRouter is ideal for the teams that want flexibility to experiment with different models, change providers based on availability or pricing, or use multiple models for different scenarios, all possible through one integration.

Features & Use Cases

All the Best AI Models in One Place
Use top models like Claude, GPT-4, Mistral, LLaMA, and Gemini through a single connection, so you don't have to juggle multiple accounts.

Easy to Switch & Choose
Swap between different AI models instantly to find the best mix of cost, speed, and quality without changing any code.

Never Go Offline (Automatic Backup)
If your favorite AI model goes down or gets too busy, OpenRouter automatically switches to a backup model so your calls never fail.

Clear & Simple Pricing
Easily see exactly what each model costs in real-time so you can stay right on budget.

Always Stay Flexible
Don't get stuck with just one company. Easily switch to the newest and best AI as soon as it comes out.

Use Case: Finding the Perfect Match
Easily test out different AI models side by side to see which one works best and costs the least for your specific needs.

Use Case: Guaranteed Uptime
Perfect for important support lines. With automatic backups, your voice agents will always answer the phone even if a major AI provider crashes.

Use Case: Saving Money on Calls
Automatically send simple questions to cheaper AI models while saving the expensive models for only the hardest problems.

Browse this layer

Keep exploring the voice stack

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Large Language Models

The LLM is the brain of your voice agent. It understands what callers say and decides how to respond. Bolna lets you swap between models like GPT-4o, Claude, and DeepSeek without changing your agent configuration, so you can optimize for speed, cost, or reasoning depth.

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Telephony

Telephony providers connect your voice agents to the phone network so they can make and receive real calls. Bolna supports managed integrations with major carriers as well as bring-your-own-carrier via SIP trunking, giving you full control over call routing, number provisioning, and cost.

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Speech-to-Text

Speech-to-text converts what callers say into text that your LLM can process. Transcription accuracy and latency directly affect how natural a conversation feels. Bolna supports streaming STT providers optimized for telephony audio, including specialized models for Indian languages.

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Text-to-Speech

Text-to-speech turns your agent responses into spoken audio. Voice quality shapes how callers perceive your brand. Flat, robotic speech kills trust while natural, expressive voices build it. Bolna integrates with the fastest TTS providers so responses sound human and arrive without awkward pauses.

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Tools & Workflows

Tools let your voice agents take action during a call, not just talk. Book a calendar slot, look up an order in Shopify, push a lead into your CRM, or trigger a multi-step automation in Zapier. These integrations turn voice agents from answering machines into workflow engines.

See where OpenRouter fits in your production workflow

Use the demo to walk through provider selection, stack tradeoffs, and the exact workflow you want Bolna to automate.