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  • The following LLM models are being deprecated and replaced with newer versions:
    • OpenAI models:
      • gpt-4o → replaced with gpt-4.1
      • gpt-4o-mini → replaced with gpt-4.1-mini
    • Anthropic Claude models:
      • claude-3.7-sonnet → replaced with claude-4.5-sonnet
      • claude-4.0-sonnet → replaced with claude-4.5-sonnet
    • Google Gemini models:
      • gemini-2.0-flash → replaced with gemini-2.5-flash
      • gemini-2.0-flash-lite → replaced with gemini-2.5-flash-lite
    • After 10/30/2025, the deprecated models will no longer be available.
  • We are making start_speaker as a required attribute in create-retell-llm API in the most recent SDK. We will support the old SDK until 10/30/2025. Afterwards, start_speaker validation will be enforced.