claude-on-vertex-ai changedbuild-with-claude/claude-on-vertex-ai
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77The API for accessing Claude on Google Cloud's Agent Platform is nearly identical to the [Messages API](https://platform.claude.com/docs/en/api/messages/create), with two key differences in request format:
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99* On Agent Platform, `model` is not passed in the request body. Instead, it is specified in the Google Cloud endpoint URL.
10* On Agent Platform, `anthropic_version` is passed in the request body (rather than as a header), and must be set to the value `vertex-2023-10-16`.
10* On Agent Platform, `anthropic_version` is passed in the request body (rather than as a header), and must be set to the value `vertex-2023-10-16`, or to [API version `2026-10-21`](https://platform.claude.com/docs/en/api/migration-2026-10-21).
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1212Agent Platform is also supported by Anthropic's official [client SDKs](https://platform.claude.com/docs/en/cli-sdks-libraries/overview). This guide walks you through making a request to Claude on Agent Platform using one of Anthropic's client SDKs.
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