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Add changelog for 2025-07-18 #580

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Jul 18, 2025
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Add changelog for 2025-07-18 #580

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1 change: 1 addition & 0 deletions fern/changelog/2025-07-18.mdx
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1. **Custom headers for custom LLM models**: You can now add custom `headers` to both [`Custom LLM Models`](https://api.vapi.ai/api#:~:text=CustomLLMModel) and [`Workflow Custom Models`](https://api.vapi.ai/api#:~:text=WorkflowCustomModel) (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. The `headers` property overrides default headers (except `Authorization`, which should be set via your custom-llm credential).
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