GPT-5.5-Pro vs GLM-4.7
OpenAI GPT-5.5-Pro | Z.ai GLM-4.7 | |
|---|---|---|
| Overview | ||
| Company | OpenAI | Z.ai |
| Release date | Apr 23 2026 | Dec 22 2025 |
| Access | Proprietary | Open Weight |
| Specifications | ||
Context window | — | 128k |
| 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. | 36% | — |
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. | — | 73.8% |
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. | — | 41% |
Web browsing BrowseCompCan the AI browse the web and track down hard-to-find answers? Higher is better. | 90.1%Best | 52% |
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. | — | 24.8% |
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. | — | 42.8% |
Advanced math FrontierMath · Tier 1–3Very hard, research-level math problems. Tiers 1–3 are the (still extremely difficult) lower tiers. Higher is better. | 52.4% | — |
Advanced math FrontierMath · Tier 4Very hard, research-level math problems. Tier 4 is the hardest — close to what professional research mathematicians tackle. Higher is better. | 39.6% | — |
Science GPQA DiamondGraduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | — | 85.7% |
Knowledge work GDPval (win/tie rate)How often the AI's work matches or beats a human expert's on real knowledge-work tasks. Higher is better. | 82.3% | — |
| Timeline | ||
| Release gap | GLM-4.7 shipped 122 days before GPT-5.5-Pro | |
Which is better: GPT-5.5-Pro or GLM-4.7?
GPT-5.5-Pro leads GLM-4.7 on 1 of the 1 benchmark they both report (BrowseComp). GLM-4.7 shipped 122 days before GPT-5.5-Pro, so benchmark comparisons should account for the intervening progress.
GPT-5.5-Pro is proprietary, while GLM-4.7 is open weight.
On BrowseComp, GPT-5.5-Pro leads at 90.1% vs GLM-4.7 at 52%.
Frequently asked questions
GPT-5.5-Pro was released by OpenAI on Apr 23 2026.
GLM-4.7 was released by Z.ai on Dec 22 2025.
GPT-5.5-Pro is a proprietary model released by OpenAI. GLM-4.7 is an open weight model released by Z.ai.
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