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OpenAI Codex
The Benchmark Leader
OpenAI's coding agent (CLI, VS Code extension, and cloud sandboxes). Codex recommends GPT-6.1 Sol (September 29, 2026), available on paid plans (Plus, Pro, Business, Enterprise, Edu). GPT-6 Sol and GPT-6 Luna rolled out September 22, 2026, succeeding GPT-5.6 Sol; GPT-6 Astra (OpenAI's flagship, launched Sept 3, 2026) is also available. #1 on Terminal-Bench 2.1 (87.4% with GPT-6 Astra, per tbench.ai), with background cloud task execution.
✓Strengths
- •#1 on Terminal-Bench 2.1 (87.4% with GPT-6 Astra, per tbench.ai)
- •Recommends GPT-6.1 Sol (Sep 29, 2026); GPT-6 Sol, GPT-6 Luna, and GPT-6 Astra also available
- •Cloud sandboxes run coding tasks in the background
- •Very fast on greenfield work (scaffolding, APIs, landing pages)
- •Local CLI + cloud duality
- •Included with ChatGPT Plus ($20/month entry)
⚠Considerations
- •Token-based billing makes heavy-use costs unpredictable
- •Typical heavy use runs $100-200/month
- •Less surgical than Claude Code on legacy refactors per reviews
Pricing & Details
Pricing
From $20/month (ChatGPT Plus) + usage-based tokens (GPT-6 Sol)
Free Option
No (requires ChatGPT Plus or API)
Best For
Maximum raw capability, background cloud agents, greenfield speed
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