Claude Sonnet 5.5 changelog

Full Claude Platform available on Google Cloud (Anthropic managed)

Claude Models on Google Cloud (Anthropic managed) is generally available with US and Global endpoints. It gives Google Cloud customers the full Claude Platform feature set with Google Cloud IAM, billing and commitment drawdown. Fable 5.1, Opus 5.5, Sonnet 5.5 and Haiku 5.5 are available, and fast mode for Opus 5.5 costs $8 / $40 per million input and output tokens there.

Who is affected:

Teams that buy Claude through Google Cloud and want features that the Google-managed offering lacks.

What to do:

No action needed. Google Cloud customers who need same-day Claude API features can switch to the Anthropic-managed offering.

Antigravity 2.24 adds model choice for automations and Claude 5.5 models through Vertex AI

Antigravity app 2.24.0 lets automations run on Flash Lite, Flash or Pro, adds /compact and a redesigned side panel. With Application Default Credentials sign-in, the model picker offers Claude Opus 5.5 and Claude Sonnet 5.5 when the Google Cloud project has access to them.

Claude Sonnet 5.5 released

Claude Sonnet 5.5 launched at the same $2 / $10 per million tokens as Sonnet 5, with cache reads at $0.10 per million tokens after the October 7 cut.

Who is affected:

Developers and subscribers using Claude Sonnet 5.

What to do:

Test claude-sonnet-5-5. Switch thinking disabled to between_tools and stop forcing tool_choice.

Claude Sonnet 5.5 available in GitHub Copilot

Claude Sonnet 5.5 is available on Copilot Pro, Pro+, Max, Business and Enterprise at provider list price.