GPT-5.4 mini vs GLM-5.2
OpenAI GPT-5.4 mini | Z.ai GLM-5.2 | |
|---|---|---|
| Overview | ||
| Company | OpenAI | Z.ai |
| Release date | Mar 17 2026 | Jun 16 2026 |
| Access | Proprietary | Open Weight |
| Specifications | ||
Parameters | — | 744B |
Context window | 400k | 1M |
| 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. | 32%Best | 31% |
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 coding CursorBench v3.1Cursor's own test of harder, real-world coding tasks inside a code editor. Higher is better. | — | 54.6% |
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. | — | 88% |
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% |
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. | — | 54.7% |
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% |
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. | — | 1580 |
| Timeline | ||
| Release gap | GPT-5.4 mini shipped 91 days before GLM-5.2 | |
Which is better: GPT-5.4 mini or GLM-5.2?
GPT-5.4 mini leads GLM-5.2 on 1 of the 1 benchmark they both report (BullshitBench v2). GPT-5.4 mini shipped 91 days before GLM-5.2, so benchmark comparisons should account for the intervening progress.
Context windows are 400k (GPT-5.4 mini) vs 1M (GLM-5.2). GPT-5.4 mini is proprietary, while GLM-5.2 is open weight.
On BullshitBench v2, GPT-5.4 mini leads at 32% vs GLM-5.2 at 31%.
Frequently asked questions
GPT-5.4 mini was released by OpenAI on Mar 17 2026.
GLM-5.2 was released by Z.ai on Jun 16 2026.
GPT-5.4 mini has a 400k context window; GLM-5.2 has 1M.
GPT-5.4 mini is a proprietary model released by OpenAI. GLM-5.2 is an open weight model released by Z.ai.
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