Create a Message changedapi/beta/messages/create
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31053105 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
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3107 - `"claude-haiku-5-5"`
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3109 Fastest model for high-volume, real-time tasks
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31073111 - `"claude-sonnet-5-5"`
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31093113 Efficient model for coding and agents
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69716975 See [models](https://docs.anthropic.com/en/docs/models-overview) for additional details and options.
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6977 - `"claude-haiku-5-5"`
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6979 Fastest model for high-volume, real-time tasks
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69736981 - `"claude-sonnet-5-5"`
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69756983 Efficient model for coding and agents
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71947202 Configuration overrides for specific tools, keyed by tool name
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7196 - `defer_loading: optional boolean`
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7198 - `enabled: optional boolean`
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7200 - `default_config: optional BetaMCPToolDefaultConfig`
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7202 Default configuration applied to all tools from this server
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7204 - `
7204 - `defer_loading: optional boolea
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