{"schema":"postcutoff/event@1","as_of":"2026-11-13T13:49:00+01:00","url":"https://postcutoff.com/e/2025-02-24-claude-3-7-sonnet-claude-code/","md":"https://postcutoff.com/e/2025-02-24-claude-3-7-sonnet-claude-code/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":"2025-02-24-claude-3-7-sonnet-claude-code","date":"2025-02-24","date_precision":"day","short_title":"Claude 3.7 Sonnet (hybrid reasoning) and Claude Code preview","deck":null,"takeaway":"Anthropic released Claude 3.7 Sonnet, the first hybrid reasoning model able to answer instantly or use visible extended thinking, together with a research preview of Claude Code, an agentic coding tool that runs in the terminal.","category":"model-release","category_label":"Model releases","importance":4,"confidence":"high","status":{"key":"confirmed","labels":["Confirmed"]},"sources":[{"n":1,"title":"Claude 3.7 Sonnet and Claude Code (Anthropic)","url":"https://www.anthropic.com/news/claude-3-7-sonnet","type":"official","group":"primary","domain":"anthropic.com"},{"n":2,"title":"Claude Code documentation","url":"https://docs.anthropic.com/en/docs/claude-code/overview","type":"docs","group":"primary","domain":"docs.anthropic.com"}],"official":2,"filed":"2026-09-29","updated":"2026-09-29","orgs":["Anthropic"],"title":"Claude 3.7 Sonnet (hybrid reasoning) and Claude Code preview","summary":"Anthropic released Claude 3.7 Sonnet, the first hybrid reasoning model able to answer instantly or use visible extended thinking, together with a research preview of Claude Code, an agentic coding tool that runs in the terminal.","key_facts":["Released 24 February 2025","Extended thinking mode with user-controllable thinking budget via API","SWE-bench Verified: 62.3% (70.3% with custom scaffold), per Anthropic","Claude Code launched as a limited research preview; generally available with Claude 4 in May 2025"],"key_numbers":[],"tags":["llm","reasoning","claude","coding","agents"],"science":null,"body_md":"## What happened\n\nAnthropic combined fast responses and deep reasoning in one model and shipped a command-line agent that edits code, runs tests and commits on its own.\n\n## Why it matters\n\nClaude Code became a breakout product and a template for terminal coding agents (Codex CLI, Gemini CLI), shifting software development toward agent delegation.","disputed":[],"related":[{"id":"2025-05-22-claude-4","url":"https://postcutoff.com/e/2025-05-22-claude-4/","date":"2025-05-22","date_precision":"day","short_title":"Anthropic releases Claude Opus 4 and Sonnet 4","deck":"Claude Code goes GA","takeaway":"Cemented Claude's lead in coding agents and was the first frontier deployment under elevated safeguards for CBRN risk.","category":"model-release","category_label":"Model releases","importance":5,"confidence":"high","status":{"key":"confirmed","labels":["Confirmed"]},"sources":3,"official":3,"filed":"2026-09-29","updated":"2026-09-29","orgs":["Anthropic"]},{"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"]}],"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-3-7-sonnet-hybrid"}