AINewsnow

Claude Sonnet 4.5 retires on November 30. The migration is not one line

On November 30, 2026, Anthropic retires claude-sonnet-4-5-20250929 from the Claude API. After that date, requests to it fail. They do not slow down or fall back to something close. They return an error. As of November 9, that is 21 days away. The same day, fast mode for Claude Opus 4.8 is removed,…

Read the full story at DEV Community — AI ↗

Timeline · 1 report

  1. 2026-11-11 05:01 · DEV Community — AI
    Claude Sonnet 4.5 retires on November 30. The migration is not one line

More stories

  1. Anthropic targets $1.4 trillion valuation in IPO, trading expected to begin Nov. 19 — CNBC Technology
  2. Cognizant Launches Claude Managed Services With 25,000-Strong Frontier Capability Group — Economic Times Tech
  3. Anthropic expands Claude into a workspace with Sheets, Whiteboards, and Meetings — Anthropic (X)
  4. Anthropic opens Australian retail IPO offering ahead of planned Nasdaq listing — CNBC Technology
  5. Anthropic bankers weigh raising IPO valuation to $1.5tn or more on strong demand — Financial Times AI
  6. Meta releases Muse Ember, a new lightweight model for agent execution — TechCrunch AI
  7. Claude expands support for MCP Apps extension with app tools and embedded sites — Anthropic (X)
  8. Anthropic launches Claude Fable 5.2 ahead of IPO, still recommends Opus 5.5 for most users — Tom's Guide AI

Get the daily brief of stories like this at 6:30 every morning →