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

2026-06-15 digest confirmed

  • 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 after the cutoff. 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 at the cutoff today and must move to the successor IDs.
  • Follow-up: Confirm the cutoff held at 09:00 PT and watch for breakage reports from integrations that missed the migration.

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