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 was retired on July 1, 2026, replaced by Devin Local, and the default surface shifted 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.
OpenAI is winding Sora down to nothing. The standalone Sora app and website were discontinued on April 26, 2026, ChatGPT's video generation was pulled around the March 24 announcement, and the last surface — the Sora 2 Videos API — shuts down on September 24, 2026 with no replacement model.
Google is sunsetting Firebase Studio (the successor to Project IDX). New workspace creation and signups were disabled on June 22, 2026, and the whole environment shuts down on March 22, 2027 — after which any project still inside it is permanently deleted. Google is redirecting users to Antigravity and Google AI Studio rather than carrying Firebase Studio forward.