Every major LLM provider's deprecation, shutdown, and breaking-change events — one normalized timeline.
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Standard API requests to claude-3-opus-20240229 fail; access only by special request afterward.
Kept available on claude.ai for paid users and by request on the API post-retirement (unusual — most retirements hard-fail).
Model picker entries disappear; saved chats on these models silently switch to GPT-5.2. ~2 weeks notice.
Apps pinned to the floating chatgpt-4o-latest alias start erroring; must pin a dated snapshot or migrate.
All API requests to claude-3-haiku-20240307 return an error after 2026-04-19.
Anthropic policy: at least 60 days notice for publicly released models.
Hard-coded Grok model IDs silently reroute to grok-4.3 with different behavior and pricing. Only 9 days notice.
Retires 2026-05-15 at 12:00 PM PT. Old slugs auto-redirect to grok-4.3 but are billed at grok-4.3 pricing ($1.25/$2.50 per 1M).
gemini-2.0-flash / -lite calls fail; replacement costs ~33% more. New customers already cut off.
June 1 is the EARLIEST possible shutdown; Google will give advance notice of the exact date. Already restricted to existing customers since 2026-03-06.
Requests to the Opus 4 / Sonnet 4 model IDs fail after 2026-06-15.
Anthropic policy: at least 60 days notice for publicly released models.
Entire Assistants/Threads/Runs surface stops working. Manual backfill of conversation history required.
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