{"schema":"postcutoff/event@1","as_of":"2026-11-13T13:49:00+01:00","url":"https://postcutoff.com/e/2021-06-29-github-copilot-codex/","md":"https://postcutoff.com/e/2021-06-29-github-copilot-codex/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":"2021-06-29-github-copilot-codex","date":"2021-06-29","date_precision":"day","short_title":"GitHub Copilot and OpenAI Codex bring LLMs to programming","deck":null,"takeaway":"GitHub launched Copilot as a technical preview, an AI pair programmer powered by OpenAI Codex, a GPT model fine-tuned on public code; the Codex paper introduced the HumanEval benchmark.","category":"product","category_label":"Products","importance":4,"confidence":"high","status":{"key":"confirmed","labels":["Confirmed"]},"sources":[{"n":1,"title":"Evaluating Large Language Models Trained on Code (arXiv)","url":"https://arxiv.org/abs/2107.03374","type":"paper","group":"primary","domain":"arxiv.org"},{"n":2,"title":"Introducing GitHub Copilot: your AI pair programmer (GitHub Blog)","url":"https://github.blog/news-insights/product-news/introducing-github-copilot-ai-pair-programmer/","type":"official","group":"primary","domain":"github.blog"},{"n":3,"title":"Wikipedia: GitHub Copilot","url":"https://en.wikipedia.org/wiki/GitHub_Copilot","type":"discussion","group":"reactions","domain":"en.wikipedia.org"}],"official":2,"filed":"2026-09-29","updated":"2026-09-29","orgs":["GitHub","OpenAI","Microsoft"],"title":"GitHub Copilot and OpenAI Codex bring LLMs to programming","summary":"GitHub launched Copilot as a technical preview, an AI pair programmer powered by OpenAI Codex, a GPT model fine-tuned on public code; the Codex paper introduced the HumanEval benchmark.","key_facts":["Copilot technical preview announced 29 June 2021","Codex paper 'Evaluating Large Language Models Trained on Code', arXiv 2107.03374 (July 2021)","Introduced HumanEval (164 hand-written Python problems)","Copilot became generally available in June 2022"],"key_numbers":[],"tags":["coding","llm","developer-tools"],"science":null,"body_md":"## What happened\n\nCopilot offered inline code completions in editors, generating whole functions from comments and context.\n\n## Why it matters\n\nThe first mass-market generative AI product for professionals; coding became the flagship LLM use case, leading to coding agents like Claude Code.","disputed":[],"related":[{"id":"2025-02-24-claude-3-7-sonnet-claude-code","url":"https://postcutoff.com/e/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":"Claude Code became a breakout product and a template for terminal coding agents (Codex CLI, Gemini CLI), shifting software development toward agent delegation.","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"]},{"id":"2020-05-28-gpt-3","url":"https://postcutoff.com/e/2020-05-28-gpt-3/","date":"2020-05-28","date_precision":"day","short_title":"GPT-3 (175B) shows in-context few-shot learning","deck":null,"takeaway":"Turned LLMs into a platform; many startups were built on its API, and it directly preceded InstructGPT and ChatGPT.","category":"model-release","category_label":"Model releases","importance":5,"confidence":"high","status":{"key":"confirmed","labels":["Confirmed"]},"sources":2,"official":2,"filed":"2026-09-29","updated":"2026-09-29","orgs":["OpenAI"]}],"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/github-copilot-openai-codex"}