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- Custom headers for custom LLM models: You can now add custom
headersto bothCustom LLM ModelsandWorkflow Custom Models(including in assistants, squads, and workflows). This lets you send custom HTTP headers—such as for authentication or extra metadata—when Vapi calls your custom LLM API. Theheadersproperty overrides default headers (exceptAuthorization, which should be set via your custom-llm credential).