GPT-4o vs GLM-4.6
OpenAI GPT-4o | Z.ai GLM-4.6 | |
|---|---|---|
| Overview | ||
| Company | OpenAI | Z.ai |
| Release date | May 13 2024 | Sep 30 2025 |
| Access | Proprietary | Open Weight |
| Specifications | ||
Parameters | — | 355B |
Context window | — | 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. | 12% | — |
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. | — | 68% |
| Timeline | ||
| Release gap | GPT-4o shipped 505 days before GLM-4.6 | |
Which is better: GPT-4o or GLM-4.6?
GPT-4o and GLM-4.6 don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. GPT-4o shipped 505 days before GLM-4.6, so benchmark comparisons should account for the intervening progress.
GPT-4o is proprietary, while GLM-4.6 is open weight.
Direct benchmark comparisons are unavailable — GPT-4o and GLM-4.6 don't publish scores on any of the same benchmarks.
Frequently asked questions
GPT-4o was released by OpenAI on May 13 2024.
GLM-4.6 was released by Z.ai on Sep 30 2025.
GPT-4o is a proprietary model released by OpenAI. GLM-4.6 is an open weight model released by Z.ai.