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VIVI supports a range of large language models, each suited to specific use cases. When selecting a model for your agent, consider the complexity of the tasks it needs to handle, the expected response speed, and cost. Models are selected per agent under the Model section of the agent configuration screen.

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Reasoning Tiers

Many models are available in reasoning variants — High, Medium, Low, and in some cases Minimal. These tiers control how much thinking the model does before responding.

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Available Models

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Best Practices

  • Use gpt-5.4 (High) or gpt-5.1 (High) for agents handling complex reasoning, legal, or technical content where accuracy is critical.
  • Use gpt-5-mini or gpt-5.4-nano variants for high-volume, straightforward workflows where speed and cost matter more than depth.
  • Use gpt-5.3-codex variants for agents that involve code generation, automation, or developer-facing workflows.
  • Use gpt-realtime models only for voice-enabled agents — they are optimized for low-latency audio and are not suited for text-heavy or long-context tasks.
  • When in doubt, start with a Medium reasoning tier and adjust based on response quality and latency in testing.