Claude 4 Models Now Available in Vapi

Claude 4 Opus + Sonnet Now Available in Vapi

You can now use Claude 4 Opus and Claude 4 Sonnet directly inside Vapi.

Why It Matters for Voice AI

Claude handles nuance better. That shows up everywhere:

• Fewer Hallucinations → Lower risk on real calls, especially in regulated or high-stakes domains.
• Better Context Retention → Agents can reference past turns without getting confused.
• Cleaner Tool Usage → Claude tends to form better API calls with less scaffolding.

All of that leads to more trustworthy, understandable, and resilient voice experiences.

You’ll spend less time patching edge cases and more time building actual logic.

Where It’s Useful

Some patterns we’re seeing:

• Agents for finance or healthcare that need to reason through eligibility or plan options.
• Customer service flows that rely on accurate form-filling or follow-ups.
• Assistants with long, multi-turn troubleshooting scripts.
• Workflows that hand off between models based on task complexity or latency budget.

Real Takeaway

We’re not betting on any single model. Vapi’s architecture is open. But Claude gives you a stronger default, especially when you need voice agents that don’t break under pressure.

Test it. Pair it. Swap it. It’s just config.