GPT-5.3-Codex-Spark vs GLM-5.2
OpenAI GPT-5.3-Codex-Spark | Z.ai GLM-5.2 | |
|---|---|---|
| Overview | ||
| Company | OpenAI | Z.ai |
| Release date | Feb 12 2026 | Jun 16 2026 |
| Access | Proprietary | Open Weight |
| Specifications | ||
Parameters | — | 744B |
Context window | 128k | 1M |
| Benchmarks | ||
Agentic coding SWE-Bench ProCan the AI fix real bugs in real software? It's handed actual problems from open-source projects and has to write code that genuinely solves them. Higher is better. | — | 62.1% |
Agentic terminal coding Terminal-Bench 2.1Can the AI work in a command-line terminal — running commands and finishing technical setup tasks the way a developer would? Higher is better. | — | 81% |
Multidisciplinary reasoning Humanity's Last Exam · no toolsHumanity's Last Exam — extremely hard expert questions across many subjects, written so you can't just look up the answer. “No tools” means the AI answers on its own. Higher is better. | — | 40.5% |
Science GPQA DiamondGraduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | — | 91.2% |
| Timeline | ||
| Release gap | GPT-5.3-Codex-Spark shipped 124 days before GLM-5.2 | |
Which is better: GPT-5.3-Codex-Spark or GLM-5.2?
GPT-5.3-Codex-Spark and GLM-5.2 don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. GPT-5.3-Codex-Spark shipped 124 days before GLM-5.2, so benchmark comparisons should account for the intervening progress.
Context windows are 128k (GPT-5.3-Codex-Spark) vs 1M (GLM-5.2). GPT-5.3-Codex-Spark is proprietary, while GLM-5.2 is open weight.
Direct benchmark comparisons are unavailable — GPT-5.3-Codex-Spark and GLM-5.2 don't publish scores on any of the same benchmarks.
Frequently asked questions
GPT-5.3-Codex-Spark was released by OpenAI on Feb 12 2026.
GLM-5.2 was released by Z.ai on Jun 16 2026.
GPT-5.3-Codex-Spark has a 128k context window; GLM-5.2 has 1M.
GPT-5.3-Codex-Spark is a proprietary model released by OpenAI. GLM-5.2 is an open weight model released by Z.ai.