What is this?
AI coding is the fastest-moving corner of AI: models that write, review, debug and refactor software. It began as line-by-line autocomplete and has become autonomous "agentic coding". You describe an outcome, and the AI plans, edits files, runs tests and iterates. Surveys suggest a large share of all new code at major tech companies is now AI-assisted.
Key tools & players
- Claude Code (Anthropic) — terminal-first agentic coding
- GitHub Copilot (Microsoft/OpenAI) — the assistant that started the wave
- Cursor — AI-native code editor
- OpenAI Codex — cloud coding agents
- Open-weight challengers: DeepSeek, Qwen, Kimi, Inkling — frontier-level coding at a fraction of the price
Milestones
- 2021-2024 — Autocomplete becomes conversation, SWE-bench scores real repository fixes, and agents pick up terminals
- 2025 — "Vibe coding" enters the dictionary; agentic tools (Claude Code, Codex) go mainstream
- 2026 — Open-weight models close in on the frontier and take the lead, and coding-per-dollar collapses
- Aug 2026 — SpaceX closes its $60 billion all-stock purchase of Cursor: the leading AI-native editor is no longer an independent company
- Sep 2026 — Anthropic ships Fable 5.1 and OpenAI ships GPT-6 Astra, the first model its maker rates Critical for cyber risk
- Sep 2026 — An Nvidia model outscores the top human at the International Olympiad in Informatics
- Sep 2026 — GitSpawn: a repository's own git config runs code in seven coding agents before anyone approves it
- Sep 2026 — Cursor ships Projects: a coordinator agent that writes no code and directs thousands of subagents
- Sep 2026 — Devin agents rewrite a maths library for GPUs and set a public code-breaking record for $400,000
- Sep 2026 — Rails's creator says hand-written code is now only for repairing an agent that misfires
Mini glossary
- SWE-bench: benchmark where models fix real GitHub issues end-to-end
- Agentic coding: AI that plans and executes multi-step coding work autonomously
- Vibe coding: building software by describing intent and reviewing results, barely touching code