GLM-5 vs GPT-5.2

Pick GPT-5.2 if you want the stronger benchmark profile. GLM-5 only becomes the better choice if reasoning is the priority or you want the cheaper token bill.

GPT-5.2 is clearly ahead on the provisional aggregate, 83 to 77. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.

GPT-5.2's sharpest advantage is in knowledge, where it averages 92.4 against 70.7. The single biggest benchmark swing on the page is GPQA, 86% to 92.4%. GLM-5 does hit back in reasoning, so the answer changes if that is the part of the workload you care about most.

GPT-5.2 is also the more expensive model on tokens at $2.00 input / $8.00 output per 1M tokens, versus $0.00 input / $0.00 output per 1M tokens for GLM-5. That is roughly Infinityx on output cost alone. GPT-5.2 is the reasoning model in the pair, while GLM-5 is not. That usually helps on harder chain-of-thought-heavy tests, but it can also mean more latency and more token spend in real use. GPT-5.2 gives you the larger context window at 400K, compared with 200K for GLM-5.