Claude Sonnet 4 and Sonnet 4.5 now support 1M context window

November 26, 2025

Claude Sonnet 4 and Claude Sonnet 4.5 models on the AI Gateway now support 1M context window by default.

What’s Changed

• 1M Context Window: Sonnet 4 and Sonnet 4.5 models now use the extended 1M token context window by default
• All Providers: This update applies to Anthropic API, AWS Bedrock, and Google Vertex AI

No configuration changes are needed - requests to Sonnet 4 models will automatically use the extended context window.