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13451345Use with the `betas` field in `ClaudeAgentOptions` to enable beta features.
13461346
13471347<Warning>
1348 The `context-1m-2025-08-07` beta is retired as of April 30, 2026. Passing this header with Claude Sonnet 4.5 or Sonnet 4 has no effect, and requests that exceed the standard 200k-token context window return an error. To use a 1M-token context window, migrate to [Claude Opus 5, Claude Sonnet 5, Claude Sonnet 4.6, Claude Opus 4.6, Claude Opus 4.7, or Claude Opus 4.8](https://platform.claude.com/docs/en/about-claude/models/overview), which include 1M context at standard pricing with no beta header required.
1348 The `context-1m-2025-08-07` beta is retired as of April 30, 2026. Passing this header with Claude Sonnet 4.5 or Sonnet 4 has no effect, and requests that exceed the standard 200k-token context window return an error. To use a 1M-token context window, migrate to [Claude Opus 5.5, Claude Opus 5, Claude Sonnet 5, Claude Sonnet 4.6, Claude Opus 4.6, Claude Opus 4.7, or Claude Opus 4.8](https://platform.claude.com/docs/en/about-claude/models/overview), which include 1M context at standard pricing with no beta header required.
13491349</Warning>
13501350
13511351### `McpSdkServerConfig`