{"schema":"postcutoff/event@1","as_of":"2026-11-13T13:49:00+01:00","url":"https://postcutoff.com/e/2024-06-20-claude-3-5-sonnet/","md":"https://postcutoff.com/e/2024-06-20-claude-3-5-sonnet/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":"2024-06-20-claude-3-5-sonnet","date":"2024-06-20","date_precision":"day","short_title":"Claude 3.5 Sonnet launches with Artifacts","deck":null,"takeaway":"Claude 3.5 Sonnet outperformed Claude 3 Opus at twice the speed and a fifth of the price, and quickly became developers' favorite coding model; claude.ai added Artifacts, a side panel for live code and documents.","category":"model-release","category_label":"Model releases","importance":4,"confidence":"high","status":{"key":"confirmed","labels":["Confirmed"]},"sources":[{"n":1,"title":"Introducing Claude 3.5 Sonnet (Anthropic)","url":"https://www.anthropic.com/news/claude-3-5-sonnet","type":"official","group":"primary","domain":"anthropic.com"},{"n":2,"title":"Wikipedia: Claude (language model)","url":"https://en.wikipedia.org/wiki/Claude_(language_model)","type":"discussion","group":"reactions","domain":"en.wikipedia.org"}],"official":1,"filed":"2026-09-29","updated":"2026-09-29","orgs":["Anthropic"],"title":"Claude 3.5 Sonnet launches with Artifacts","summary":"Claude 3.5 Sonnet outperformed Claude 3 Opus at twice the speed and a fifth of the price, and quickly became developers' favorite coding model; claude.ai added Artifacts, a side panel for live code and documents.","key_facts":["Released 20 June 2024","Priced at $3 / $15 per million input/output tokens","200K context window","Artifacts feature introduced in claude.ai","An upgraded version released 22 October 2024 added computer use"],"key_numbers":[],"tags":["llm","claude","anthropic","coding"],"science":null,"body_md":"## What happened\n\nAnthropic's mid-tier model surpassed its previous flagship across reasoning, coding and vision evaluations.\n\n## Why it matters\n\nEstablished Claude as the leading coding model, driving adoption in tools like Cursor and paving the way for coding agents.","disputed":[],"related":[{"id":"2024-10-22-claude-computer-use","url":"https://postcutoff.com/e/2024-10-22-claude-computer-use/","date":"2024-10-22","date_precision":"day","short_title":"Anthropic releases computer use for Claude 3.5 Sonnet","deck":null,"takeaway":"Launched GUI agents at the frontier; OpenAI's Operator and Google's Project Mariner followed within months.","category":"agents","category_label":"Agents","importance":4,"confidence":"high","status":{"key":"confirmed","labels":["Confirmed"]},"sources":2,"official":2,"filed":"2026-09-29","updated":"2026-09-29","orgs":["Anthropic"]},{"id":"2024-03-04-claude-3","url":"https://postcutoff.com/e/2024-03-04-claude-3/","date":"2024-03-04","date_precision":"day","short_title":"Anthropic launches the Claude 3 family (Opus, Sonnet, Haiku)","deck":null,"takeaway":"Ended GPT-4's year-long uncontested lead and established the Opus/Sonnet/Haiku naming used thereafter.","category":"model-release","category_label":"Model releases","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/claude-3-5-sonnet-artifacts"}