GPT-5.4 mini vs GLM-5.1
OpenAI GPT-5.4 mini | Z.ai GLM-5.1 | |
|---|---|---|
| Overview | ||
| Company | OpenAI | Z.ai |
| Release date | Mar 17 2026 | Apr 7 2026 |
| Access | Proprietary | Open Weight |
| Specifications | ||
Parameters | — | 744B |
Context window | 400k | 200k |
| 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 | 22% |
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. | — | 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. | — | 63.5% |
Web browsing BrowseCompCan the AI browse the web and track down hard-to-find answers? Higher is better. | — | 68% |
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. | — | 52.3% |
Science GPQA DiamondGraduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | — | 86.2% |
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. | — | 1527 |
| Timeline | ||
| Release gap | GPT-5.4 mini shipped 21 days before GLM-5.1 | |
Which is better: GPT-5.4 mini or GLM-5.1?
GPT-5.4 mini leads GLM-5.1 on 1 of the 1 benchmark they both report (BullshitBench v2). GPT-5.4 mini shipped 21 days before GLM-5.1, so benchmark comparisons should account for the intervening progress.
Context windows are 400k (GPT-5.4 mini) vs 200k (GLM-5.1). GPT-5.4 mini is proprietary, while GLM-5.1 is open weight.
On BullshitBench v2, GPT-5.4 mini leads at 32% vs GLM-5.1 at 22%.
Frequently asked questions
GPT-5.4 mini was released by OpenAI on Mar 17 2026.
GLM-5.1 was released by Z.ai on Apr 7 2026.
GPT-5.4 mini has a 400k context window; GLM-5.1 has 200k.
GPT-5.4 mini is a proprietary model released by OpenAI. GLM-5.1 is an open weight model released by Z.ai.
Other comparisons
GPT-5.4 mini vs Claude Sonnet 5GLM-5.1 vs Claude Sonnet 5GPT-5.4 mini vs Gemini 3.5 FlashGLM-5.1 vs Gemini 3.5 FlashGPT-5.4 mini vs Muse Spark 1.1GLM-5.1 vs Muse Spark 1.1GPT-5.4 mini vs Grok 4.5GLM-5.1 vs Grok 4.5GPT-5.4 mini vs DeepSeek-V4-ProGLM-5.1 vs DeepSeek-V4-ProGPT-5.4 mini vs Mistral Medium 3.5GLM-5.1 vs Mistral Medium 3.5