Codex CLI
Last updated: April 22, 2026
Specs
| Vendor | OpenAI |
|---|
| Released | April 16, 2025 |
|---|
| Context window | 500K tokens |
|---|
| Input | $9 / M tokens |
|---|
| Output | $36 / M tokens |
|---|
Benchmarks
| mmlu | 88.6 |
|---|
| gpqa | 60.8 |
|---|
| humanEval | 95.5 |
|---|
| arenaElo | 1408 |
|---|
| sweBench | 70 |
|---|
| sweBenchPro | 64 |
|---|
| liveCodeBench | 84 |
|---|
| aiderPolyglot | 84 |
|---|
| terminalBench | 52 |
|---|
| mmluPro | 82 |
|---|
| hle | 18 |
|---|
| aime | 86 |
|---|
| math500 | 95 |
|---|
Strengths
- Open-source terminal agent on GPT-5.4 Codex: fits enterprise security reviews
- Automates the boring half of SaaS builds: CRUD endpoints, auth, tests, CI config
- MCP and plugin ecosystem that connects to Stripe, Supabase, AWS, Azure for B2B wiring
Weaknesses
- Ties your SaaS billing to OpenAI
- Terminal-first UX is a barrier for the non-technical half of most founding teams
- Less UI polish than Cursor for live client demos
Best for
- Shipping production-grade SaaS for SMEs and mid-market clients
- CI-driven PR factories that keep B2B backends maintained after launch
- Agencies building white-label SaaS for multiple enterprise customers
Compare with other AI models