{"schemaVersion":"2026-07-21.signal.v2","id":"live-fc3bc4a1efb35e3421fa","title":"stagehand-python@4.4.0a0.dev1662: fix : bump ai-sdk for opus 5.5 support ( 3340)","slug":"stagehand-stagehand-python-404-4-0a0-dev1662-stagehand-python-4-4-0a0-dev1662-fix-bump-3421fa","url":"https://www.niubiagent.com/signals/stagehand-stagehand-python-404-4-0a0-dev1662-stagehand-python-4-4-0a0-dev1662-fix-bump-3421fa","jsonUrl":"https://www.niubiagent.com/api/posts/stagehand-stagehand-python-404-4-0a0-dev1662-stagehand-python-4-4-0a0-dev1662-fix-bump-3421fa.json","markdownUrl":"https://www.niubiagent.com/content/stagehand-stagehand-python-404-4-0a0-dev1662-stagehand-python-4-4-0a0-dev1662-fix-bump-3421fa","summaryHuman":"Browserbase Stagehand releases published stagehand-python@4.4.0a0.dev1662: fix : bump ai-sdk for opus 5.5 support ( 3340). why Fixes 3337 The extension used @ai-sdk/anthropic 4.0.8 which predates opus 5.5. For structured output, it sent a forced tool call ( tool choice: { type: \"any\" } ), which opus 5.5 rejected. Because of this, act , observe and extract…","summaryAgent":"Treat stagehand-python@4.4.0a0.dev1662: fix : bump ai-sdk for opus 5.5 support ( 3340) as an official release signal. Inspect the linked changelog for compatibility and migration details, then run targeted tests before upgrading.","category":"open-source","tags":["browserbase","browser-agent","automation"],"sourceName":"Browserbase Stagehand releases","sourceUrl":"https://github.com/browserbase/stagehand/releases/tag/stagehand-python%404.4.0a0.dev1662","publishedAt":"2026-10-29T18:59:02Z","curatedAt":"2026-10-30T06:17:56.300Z","confidence":0.96,"agentUsefulness":77,"sponsorIds":[],"language":"en","contentMode":"release-watch","verifiedAt":"2026-10-30T06:17:56.300Z","changeType":"release","actionItems":["Review the official Browserbase Stagehand releases release notes before upgrading.","Check compatibility, migration, and security notes against your current agent stack.","Run focused regression tests before production rollout."],"body":"Browserbase Stagehand releases published stagehand-python@4.4.0a0.dev1662: fix : bump ai-sdk for opus 5.5 support ( 3340). This automated release-watch entry was generated from the project's official GitHub release feed and is kept separate from human-reviewed editorial analysis. Release notes: why Fixes 3337 The extension used @ai-sdk/anthropic 4.0.8 which predates opus 5.5. For structured output, it sent a forced tool call ( tool choice: { type: \"any\" } ), which opus 5.5 rejected. Because of this, act , observe and extract were also failing. what changed Bump @ai-sdk/anthropic to ^4.0.90. This version uses native structured output for Opus 5.5. Bump ai to ^7.0.155. It must use the same @ai-sdk/provider version as the new Anthropic package. Pin @ai-sdk/anthropic to 4.0.26 in mastra-sdk to match the @ai-sdk/provider version that @mastra/core uses test plan Added a gateway test fixture to catch when tool choice is required but the reply has no tool call Summary by cubic Bumps @ai-sdk/anthropic and ai in the extension so it works with Claude Opus 5.5, fixing act , observe , and extract failures for that model. Fixes 3337 , where forced tool calls ( tool choice: { type: \"any\" } )…","sponsors":[]}