GPT-5.3 Codex
OpenAI's best agentic coding model. 77.3% Terminal-Bench, 25% faster than GPT-5.2. Specialized for autonomous code generation and debugging.
Pricing
Ratings
Pros
- 77.3% Terminal-Bench — top agentic coding
- 25% faster than GPT-5.2
- 256K context window
- Excellent code debugging
- Strong multi-language support
Cons
- Behind Claude Opus 4.6 on SWE-bench
- No free tier for Codex model
Benchmark Results
Best For
Agentic coding, fast code generation, multi-language development
Quick Info
- Provider
- OpenAI
- Version
- 5.3
- Released
- Feb 2026
- Context
- 256K tokens
Features
Categories
Compare GPT-5.3 With
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Claude Sonnet 4.5
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Frequently Asked Questions
Is GPT-5.3 Codex worth it in 2026?
With a rating of 4.8/5, GPT-5.3 Codex is best for Agentic coding, fast code generation, multi-language development. At $20/mo, it's competitive for its feature set.
What are the best alternatives to GPT-5.3 Codex?
Top alternatives include OpenClaw, Claude Opus 4.5, Claude Sonnet 4.5, and GPT-5.1 Instant. Each has different strengths — use our comparison tool above to see detailed head-to-head matchups.
Does GPT-5.3 Codex have a free plan?
GPT-5.3 Codex does not currently offer a free plan. Plans start at $20/mo.