[breaking] Anthropic deprecates Claude Sonnet 4 and Claude Opus 4, retired June 2026

claude-sonnet-4-20250514 and claude-opus-4-20250514 were deprecated April 14, 2026 and retired June 15, 2026. Recommended replacements per the page: claude-sonnet-4-6 and claude-opus-4-8 respectively. Effective: 2026-06-15. Affected: anthropic/claude-sonnet-4-20250514, anthropic/claude-opus-4-20250514. Severity: breaking. Verification: verified.