GPT-5.3-CodexvsGLM-5
GPT-5.3-Codex | GLM-5 | |
|---|---|---|
| Specifications | ||
Parameters | — | 744B |
| 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% | 28%Best |
Coding SWE-Bench VerifiedReal coding tasks pulled from open-source projects — the AI has to find and fix actual bugs. A human-checked version of the original SWE-Bench. Higher is better. | — | 77.8% |
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. | — | 73.3% |
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% | — |
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. | — | 56.2% |
Web browsing BrowseCompCan the AI browse the web and track down hard-to-find answers? Higher is better. | — | 75.9% |
Multidisciplinary reasoning Humanity's Last Exam · with toolsHumanity's Last Exam — extremely hard expert questions across many subjects. “With tools” means the AI is allowed to search the web or run code while answering. Higher is better. | — | 50.4% |
Science GPQA DiamondGraduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | — | 86% |
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 | 1435Best |
| Overview | ||
| Company | OpenAI | Z.ai |
| Release date | Feb 5 2026 | Feb 12 2026 |
| Access | Proprietary | Open Weight |
Which is better: GPT-5.3-Codex or GLM-5?
GLM-5 leads GPT-5.3-Codex on 2 of the 2 benchmarks they both report (BullshitBench v2, Arena Elo (Code)). GPT-5.3-Codex shipped 7 days before GLM-5, so benchmark comparisons should account for the intervening progress.
GPT-5.3-Codex is proprietary, while GLM-5 is open weight.
On BullshitBench v2, GLM-5 leads at 28% vs GPT-5.3-Codex at 24%. On Arena Elo (Code), GLM-5 leads at 1435 vs GPT-5.3-Codex at 1406.
Frequently asked questions
GPT-5.3-Codex was released by OpenAI on Feb 5 2026.
GLM-5 was released by Z.ai on Feb 12 2026.
GPT-5.3-Codex is a proprietary model released by OpenAI. GLM-5 is an open weight model released by Z.ai.
Other comparisons
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