Claude Sonnet 4 and Opus 4 models deprecated; retirement scheduled for June 15, 2026

Deprecation announced for two models:

• Claude Sonnet 4 (claude-sonnet-4-20250514)
• Claude Opus 4 (claude-opus-4-20250514)

Retirement on the Claude API scheduled for June 15, 2026. Recommended migrations:

• Sonnet 4 → Claude Sonnet 4.6
• Opus 4 → Claude Opus 4.8

See model deprecations for details.