Claude Sonnet 4 and Opus 4 retire 2026-06-15

Category: AI
Status: confirmed
Sources: Anthropic model deprecations
Summary: claude-sonnet-4-20250514 and claude-opus-4-20250514 are removed from the Claude API at 09:00 PT on 2026-06-15 with no grace period; requests to the retired model IDs fail immediately. Successors are claude-sonnet-4-6 and claude-opus-4-8. The Agent SDK credit split from subscription usage also takes effect 2026-06-15.
Why it matters: Any production integration still pinning the May 2025 model IDs breaks tomorrow morning.
Follow-up: Confirm migration is complete and watch for breakage reports after 2026-06-15.