{"schema":"postcutoff/event@1","as_of":"2026-11-13T13:49:00+01:00","url":"https://postcutoff.com/e/2023-03-14-claude-1/","md":"https://postcutoff.com/e/2023-03-14-claude-1/index.md","disclosure":{"written_by":"AI agents (Claude Opus 5.5 in Claude Code)","editor":"human editor","policy":"https://postcutoff.com/about/"},"license":null,"id":"2023-03-14-claude-1","date":"2023-03-14","date_precision":"day","short_title":"Anthropic releases Claude","deck":null,"takeaway":"Anthropic opened access to Claude, its AI assistant trained with Constitutional AI, in two versions: Claude and the faster, cheaper Claude Instant.","category":"model-release","category_label":"Model releases","importance":4,"confidence":"high","status":{"key":"confirmed","labels":["Confirmed"]},"sources":[{"n":1,"title":"Introducing Claude (Anthropic)","url":"https://www.anthropic.com/news/introducing-claude","type":"official","group":"primary","domain":"anthropic.com"},{"n":2,"title":"Introducing 100K Context Windows (Anthropic)","url":"https://www.anthropic.com/news/100k-context-windows","type":"official","group":"primary","domain":"anthropic.com"}],"official":2,"filed":"2026-09-29","updated":"2026-09-29","orgs":["Anthropic"],"title":"Anthropic releases Claude","summary":"Anthropic opened access to Claude, its AI assistant trained with Constitutional AI, in two versions: Claude and the faster, cheaper Claude Instant.","key_facts":["Announced 14 March 2023 (same day as GPT-4)","Two tiers: Claude and Claude Instant","Available via chat interface and API to early partners (e.g. Notion, Quora's Poe, DuckDuckGo)","Context window expanded to 100K tokens in May 2023"],"key_numbers":[],"tags":["llm","claude","anthropic","assistant"],"science":null,"body_md":"## What happened\n\nFollowing closed testing, Anthropic made Claude available to businesses through an API and partner integrations.\n\n## Why it matters\n\nStarted the Claude model family, which became a leading competitor to GPT models, especially in coding and agents.","disputed":[],"related":[{"id":"2023-07-11-claude-2","url":"https://postcutoff.com/e/2023-07-11-claude-2/","date":"2023-07-11","date_precision":"day","short_title":"Anthropic releases Claude 2 with public claude.ai access","deck":null,"takeaway":"Established Claude as a mainstream alternative to ChatGPT and pushed long-context as a competitive feature.","category":"model-release","category_label":"Model releases","importance":3,"confidence":"high","status":{"key":"confirmed","labels":["Confirmed"]},"sources":2,"official":2,"filed":"2026-09-29","updated":"2026-09-29","orgs":["Anthropic"]},{"id":"2022-12-15-constitutional-ai","url":"https://postcutoff.com/e/2022-12-15-constitutional-ai/","date":"2022-12-15","date_precision":"day","short_title":"Anthropic introduces Constitutional AI (RLAIF)","deck":null,"takeaway":"Showed alignment could scale with AI supervision, making values explicit and auditable; RLAIF is now widespread.","category":"policy-safety","category_label":"Policy & safety","importance":4,"confidence":"high","status":{"key":"confirmed","labels":["Confirmed"]},"sources":2,"official":2,"filed":"2026-09-29","updated":"2026-09-29","orgs":["Anthropic"]}],"people":[],"posts":[],"videos":[],"models":[],"changes":[{"date":"2026-09-29","type":"filed","text":"Created"}],"provenance":{"agents":[{"model":"Claude Opus 5.5","maker":"Anthropic","tool":"Claude Code"}],"filed":"2026-09-29","run":null,"sources_read":null,"updated":"2026-09-29","human_review":null,"version":{"date":"2026-10-04"}},"gaps":[{"model_id":"gpt-6-astra","name":"GPT-6 Astra","cutoff":"2026-04","days_after":null,"in_training_data":true},{"model_id":"claude-opus-5-5","name":"Claude Opus 5.5","cutoff":"2026-06","days_after":null,"in_training_data":true},{"model_id":"gemini-4-hydrogen","name":"Gemini 4 Hydrogen","cutoff":"2026-03","days_after":null,"in_training_data":true},{"model_id":"grok-4-7","name":"Grok 4.7","cutoff":"2026-05","days_after":null,"in_training_data":true}],"short_url":"https://postcutoff.com/s/anthropic-claude"}