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September 29, 2025 · Anthropic

Claude Sonnet 4.5 launched, with memory tool and context editing in beta

  • We’ve launched Claude Sonnet 4.5, our best model for complex agents and coding, with the highest intelligence across most tasks. Learn more in the models overview.
  • We’ve introduced global endpoint pricing for Amazon Bedrock and Vertex AI. The Claude API (1P) pricing is unaffected.
  • We’ve introduced a new stop reason model_context_window_exceeded that allows you to request the maximum possible tokens without calculating input size. Learn more in Handling stop reasons.
  • We’ve launched the memory tool in beta, enabling Claude to store and consult information across conversations. Learn more in Memory tool.
  • We’ve launched context editing in beta, providing strategies to automatically manage conversation context. The initial release supports clearing older tool results and calls when approaching token limits. Learn more in Context editing.
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Cloud Changelog

Announcements from AWS, Google Cloud, Azure, Cloudflare and the main AI providers in one searchable changelog, with daily, weekly and monthly digests.

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