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OpenAI Codex
The Benchmark Leader
OpenAI's coding agent (CLI, VS Code extension, and cloud sandboxes) running GPT-5.6 (Sol). #1 on Terminal-Bench 2.1 with background cloud task execution.
✓Strengths
- •#1 on Terminal-Bench 2.1 (83.4% with GPT-5.6 Sol)
- •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-5.6 Sol)
Free Option
No (requires ChatGPT Plus or API)
Best For
Maximum raw capability, background cloud agents, greenfield speed
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