OpenAI

GPT-5.3 Codex

Under evaluation
Maker
OpenAI
Origin
United States
Released
Feb 5, 2026
Category
Coding & Agentic

Strengths & weaknesses

  • Excellent terminal automation, git operations, and CI/CD debugging
  • Far more token-efficient than reasoning-heavy rivals on routine tasks
  • Needs detailed, unambiguous instructions; struggles with vague requests
  • Smaller context window than some rivals, a constraint on huge monorepos

Evaluation

In assessment · 55% measured

Scored on GPT-5.3 Codex · sources as of Nov 4, 2026

Price & availability

Measured the same way, deliberately kept out of the score: what a model costs doesn’t change what it can do.

w = weight, each criterion’s share of the overall score. Missing marks don’t count for or against. How scoring works

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