5h • Community Support
AI voice Agent
When it comes to scaling voice AI, concurrency matters more than setup.
From testing, I’ve noticed a difference between Retell and Vapi:
Retell can handle around 20 concurrent calls• Vapi is closer to 10 concurrent calls in most setups
But this isn’t just about the platform.
Your actual limit still depends on:
• API rate limits (LLM + voice)
• latency• backend setup
So, while the tools provide a baseline, real scaling comes from how well your system is optimized.
Most people hit infrastructure limits before platform limits.
What kind of concurrency are you actually hitting with Vapi or Retell right now?
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AI voice Agent
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