migration-guide changedmodels/sonnet-5/migration-guide

## Send a request to Claude Sonnet 5.5 ## Thinking runs by default ### Handle thinking in responses ### Turn off up-front thinking ## Migration checklist by starting model ### Every starting model ### Claude Sonnet 4.6 or earlier ### Claude Sonnet 4.5 or earlier ### Claude Sonnet 4 or earlier ### Claude Haiku 4.5 only ## Migrating to Claude Sonnet 5.5 from Claude Sonnet 5 ### Forced tool use is not supported ### Thinking blocks are tied to the model and the conversation ### Computer use needs the toolset on the Claude API and Google Cloud ### The advisor tool accepts fewer advisors ### Text between tool calls is returned in thinking blocks ### Safety classifiers and fallback ### Other changes ### Recommended changes ## Migrating to Claude Sonnet 5.5 from Claude Sonnet 4.6 and earlier Sonnet models ### Breaking changes ### Other changes ### Migrating from Claude Sonnet 4.5 or earlier ### Migrating from Claude Sonnet 4 or earlier ## Migrating to Claude Sonnet 5.5 from Claude Haiku 4.5