GPT-5.3-CodexvsComposer 2
GPT-5.3-Codex | Composer 2 | |
|---|---|---|
| Benchmarks | ||
Nonsense detection BullshitBench v2Given a confidently-worded but nonsensical prompt, does the AI spot that it makes no sense and push back — instead of playing along and inventing an answer? The score is how often it clearly called out the nonsense. Higher is better. | 24% | — |
Multilingual coding SWE-Bench MultilingualLike SWE-Bench, but the coding problems span many programming languages, not just one. Tests how broadly the AI can code. Higher is better. | — | 73.7% |
Agentic coding CursorBench v3.1Cursor's own test of harder, real-world coding tasks inside a code editor. Higher is better. | — | 52.2% |
Next.js coding Next.js EvalsVercel's open eval of how well AI coding agents build and migrate real Next.js apps — measured as the share of tasks the agent completes successfully. Higher is better. | 83%Best | 75% |
Agentic terminal coding Terminal-Bench 2.0Can the AI work in a command-line terminal — running commands and finishing technical setup tasks the way a developer would? (Version 2.0 of the test.) Higher is better. | — | 61.7% |
Community preference (code) Arena Elo (Code)Like the text arena, but people vote on which AI writes better code. The votes become a chess-style Elo rating on arena.ai. Higher is better. | 1406 | — |
| Overview | ||
| Company | OpenAI | SpaceXAI |
| Release date | Feb 5 2026 | Mar 19 2026 |
| Access | Proprietary | Proprietary |
Which is better: GPT-5.3-Codex or Composer 2?
GPT-5.3-Codex leads Composer 2 on 1 of the 1 benchmark they both report (Next.js Evals). GPT-5.3-Codex shipped 42 days before Composer 2, so benchmark comparisons should account for the intervening progress.
Published specifications for these two models are limited — see each model page for the latest details.
On Next.js Evals, GPT-5.3-Codex leads at 83% vs Composer 2 at 75%.
Frequently asked questions
GPT-5.3-Codex was released by OpenAI on Feb 5 2026.
Composer 2 was released by SpaceXAI on Mar 19 2026.
GPT-5.3-Codex leads on Next.js Evals — GPT-5.3-Codex 83% vs Composer 2 75%.
Other comparisons
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