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This tutorial creates a voice agent, integrating the realtime reasoning intelligence of Mercury 2.5 with Vapi. For this demo, you will need an Inception API key and a Vapi account.

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Authentication

  1. Navigate to Integrations in the Vapi sidebar.
Vapi sidebar with the Integrations section open
  1. Under Model Providers, click into Custom LLM (bottom right).
Custom LLM option under Model Providers in Vapi
  1. Fill in your Inception API key and click Save.
Entering the Inception API key in Vapi's Custom LLM provider

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Setting up your Mercury voice agent

  1. Navigate to Agents in the Vapi sidebar and select Create Assistant.
Creating a new assistant in Vapi
  1. Name your assistant and select your desired assistant template.
Naming the assistant and choosing a template in Vapi
  1. Select Custom LLM from the Model dropdown:
Selecting Custom LLM from the model dropdown in Vapi
  1. Fill in model details as follows:
    • Set Custom LLM URL as https://api.inceptionlabs.ai/v1
    • Set Model as mercury-2.5
    • Set Temperature to 0.75
    • Set Max Tokens to a slightly higher value, like 4096. This is because the default reasoning effort is medium, and Max Tokens includes reasoning tokens.
    • Configure First Message Mode, First Message and System Prompt as desired.
      • Scroll down to manage Tools, Structured Outputs and more.
  2. When you’re ready, hit Publish in the top right corner, and Talk to speak to Mercury 2.5!