GPT-5.5-ProvsGLM-5
GPT-5.5-Pro | 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. | 36%Best | 28% |
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% |
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. | 83% | — |
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. | 90.1%Best | 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. | 57.2%Best | 50.4% |
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. | — | 86% |
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% | — |
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 | OpenAI | Z.ai |
| Release date | Apr 23 2026 | Feb 12 2026 |
| Access | Proprietary | Open Weight |
Which is better: GPT-5.5-Pro or GLM-5?
GPT-5.5-Pro leads GLM-5 on 3 of the 3 benchmarks they both report (BullshitBench v2, BrowseComp, Humanity's Last Exam). GLM-5 shipped 70 days before GPT-5.5-Pro, so benchmark comparisons should account for the intervening progress.
GPT-5.5-Pro is proprietary, while GLM-5 is open weight.
On BullshitBench v2, GPT-5.5-Pro leads at 36% vs GLM-5 at 28%. On BrowseComp, GPT-5.5-Pro leads at 90.1% vs GLM-5 at 75.9%. On Humanity's Last Exam · with tools, GPT-5.5-Pro leads at 57.2% vs GLM-5 at 50.4%.
Frequently asked questions
GPT-5.5-Pro was released by OpenAI on Apr 23 2026.
GLM-5 was released by Z.ai on Feb 12 2026.
GPT-5.5-Pro leads on Humanity's Last Exam · with tools — GPT-5.5-Pro 57.2% vs GLM-5 50.4%.
GPT-5.5-Pro is a proprietary model released by OpenAI. GLM-5 is an open weight model released by Z.ai.