When a vendor forces the migration.
Sunsets, repricings, and product identity changes — with verified dates, what actually breaks, and the exit lanes the Feature Parity Map covers. Every claim sourced; nothing listed until it’s verified.
Premium request units are gone. Copilot now bills by token through "GitHub AI Credits" — completions stay unlimited, everything else is metered. Heavy agentic users report burning half a month's allocation in days.
On June 2, 2026, Windsurf was rebranded to Devin Desktop via an over-the-air update. The Cascade agent is end-of-life on July 1, replaced by Devin Local, and the default surface shifts from a code-first IDE to an "Agent Command Center."
OpenAI removed GPT-4o, GPT-4.1, GPT-4.1 mini, and o4-mini from ChatGPT's model picker on February 13, 2026. The models live on in the API — but for the users who built daily habits around 4o's personality, the app they paid for changed underneath them.
Every call to /v1/assistants, /v1/threads, and /v1/threads/runs stops working on August 26, 2026 — no degraded mode, no grace period. OpenAI will not auto-migrate Threads; the state migration is on you.