Claude 5.5 Migration: API Changes and Sonnet 4.5 Retirement
Claude 5.5 changes thinking and tool-use behavior, while Sonnet 4.5 retires on November 30, 2026. Use this migration calendar to inventory, test, canary and remove the old model ID.
Topic tag · Tools & Workflows
Claude web search, agents, retrieval, citations, APIs, controls, and implementation boundaries.
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Claude 5.5 changes thinking and tool-use behavior, while Sonnet 4.5 retires on November 30, 2026. Use this migration calendar to inventory, test, canary and remove the old model ID.
Anthropic documented a coordinated network of fabricated news sites, paired social accounts and rigid publishing constraints. The useful lesson is the network footprint, not a guess about whether one paragraph sounds AI-written.
An audit of GPT, Claude and Gemini found that responses to the same Ukraine-war statement bank varied across 112 language and script conditions.
Anthropic’s Enterprise compliance export records prompts, responses and text tool activity for Claude in Chrome, with important exclusions and retention limits.
Review Google Ad Manager deal blocks, Claude for Salesforce, an observed AI Mode ad format and Cloudflare indexing for extensionless R2 objects.
Audit Claude Managed Agents domain controls and the new auto permission policy as separate access, per-call, execution and evidence decisions.
Anthropic’s proposed Claude watermark uses statistical word-choice patterns in future models, not hidden Unicode characters, metadata, or an AI-detector score.
Anthropic is ending legacy Claude Workbench access and three experimental prompt-tool endpoints on August 17, 2026. Export the artifacts, inventory dependencies, and rehearse the replacement path.
Govern Claude Enterprise session transcript access with current product coverage, scoped keys, evidence limits, retention, chain of custody, and an export register.
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