{"passport":{"slug":"claude-sonnet-4-0","display_name":"Claude Sonnet 4.0","model_type":"multimodal","parameter_count":null,"context_window":null,"claimed_developer":"Anthropic","confirmed_developer":"Anthropic","developer_confirmed_at":"2026-06-27T00:00:00+00:00","developer_source":"Confirmed first-party from Anthropic's model deprecations (platform.claude.com/docs/en/about-claude/model-deprecations) and release notes, 27 June 2026.","first_appeared_at":"2025-05-14T00:00:00+00:00","first_appeared_on":"official_announcement","status":"confirmed","availability":"withdrawn","deployment_status":"not_deployed","availability_scope":null,"gate":3,"eu_ai_act":"GPAI","regulatory_status":{"eu_ai_act":"GPAI"},"open_source":false,"weights_available":false,"license":null,"provenance_chain":[],"parent_model":null,"model_family":null,"superseded_by":{"slug":"claude-sonnet-4-5","display_name":"Claude Sonnet 4.5"},"supersedes":[{"slug":"claude-sonnet-3-7","display_name":"Claude Sonnet 3.7"}],"recommended_replacement":null,"product_links":null},"events":[{"event_type":"WITHDRAWN","event_date":"2026-06-15T00:00:00+00:00","title":"Withdrawn","detail":"Anthropic retired Claude Sonnet 4.0 on 15 June 2026. It is no longer available; requests to it fail. Recorded first-party from Anthropic's model deprecations.","source_url":"https://platform.claude.com/docs/en/about-claude/model-deprecations","source_name":"anthropic.com"},{"event_type":"DEPRECATED","event_date":"2026-04-14T00:00:00+00:00","title":"Deprecated","detail":"Anthropic deprecated Claude Sonnet 4.0 on 14 April 2026. Recorded first-party from Anthropic's model deprecations.","source_url":"https://platform.claude.com/docs/en/about-claude/model-deprecations","source_name":"anthropic.com"}],"delta":{"days_unattributed":409,"claimed_developer":"Anthropic","confirmed_developer":"Anthropic","match":true}}