Claude Sonnet 4.0
Anthropic · Multimodal model · Registered 2025-05-14
IDENTITY
Confirmed by
Confirmed first-party from Anthropic's model deprecations (platform.claude.com/docs/en/about-claude/model-deprecations) and release notes, 27 June 2026.
First registered
2025-05-14 (official_announcement)
Developer confirmed
2026-06-27
PROVENANCE
Claimed developer
Anthropic
Confirmed developer
Anthropic
Delta
409 days · match confirmed