Grok 4.1 FastvsGLM-5
Grok 4.1 Fast | 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. | 19% | 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% |
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. | — | 1435 |
| Overview | ||
| Company | SpaceXAI | Z.ai |
| Release date | Nov 19 2025 | Feb 12 2026 |
| Access | Proprietary | Open Weight |
Which is better: Grok 4.1 Fast or GLM-5?
GLM-5 leads Grok 4.1 Fast on 1 of the 1 benchmark they both report (BullshitBench v2). Grok 4.1 Fast shipped 85 days before GLM-5, so benchmark comparisons should account for the intervening progress.
Grok 4.1 Fast is proprietary, while GLM-5 is open weight.
On BullshitBench v2, GLM-5 leads at 28% vs Grok 4.1 Fast at 19%.
Frequently asked questions
Grok 4.1 Fast was released by SpaceXAI on Nov 19 2025.
GLM-5 was released by Z.ai on Feb 12 2026.
Grok 4.1 Fast is a proprietary model released by SpaceXAI. GLM-5 is an open weight model released by Z.ai.
Other comparisons
Grok 4.1 FastvsClaude Opus 5GLM-5vsClaude Opus 5Grok 4.1 FastvsGPT-5.6-CyberGLM-5vsGPT-5.6-CyberGrok 4.1 FastvsGemini 3.7 FlashGLM-5vsGemini 3.7 FlashGrok 4.1 FastvsMuse GlimmerGLM-5vsMuse GlimmerGrok 4.1 FastvsDeepSeek-V4-Pro-0813GLM-5vsDeepSeek-V4-Pro-0813Grok 4.1 FastvsMistral Medium 3.5GLM-5vsMistral Medium 3.5