GLM-5.1 vs GPT-5.2
Benchmarks, API pricing and specs, head to head. Data updated 2026-06-10.
Z.ai (Zhipu) · Apr 2026
The April 2026 GLM refresh — the first open-weights model to take #1 on SWE-bench Pro, edging out Claude Opus 4.6.
OpenAI · Dec 2025
The December 2025 GPT-5 refresh: stronger coding and agentic skills than GPT-5.1 at a moderate price, now the value pick in OpenAI's lineup.
The verdict
These two models don't yet share verified results on the benchmarks we track, so judge them on specs, pricing and intended use. GLM-5.1 is about 2.2x cheaper per blended million tokens (3:1 input:output mix). GPT-5.2 also takes 400K of context versus 200K for GLM-5.1. And GLM-5.1 is open-weights (MIT), so it can be self-hosted — a structural advantage if data control or vendor independence matters.
Specs & pricing
| GLM-5.1 | GPT-5.2 | |
|---|---|---|
| modhub Index | — | — |
| Input price / 1M | $1.4 | $1.75 |
| Output price / 1M | $4.4 | $14 |
| Context window | 200K | 400K |
| Max output | 128K | 128K |
| Open weights | yes (MIT) | no |
| Reasoning model | yes | yes |
| Multimodal input | text | text, image |
| Knowledge cutoff | Feb 2026 | Aug 2025 |
| Released | Apr 2026 | Dec 2025 |
| Example monthly cost* | $20.60 | $38.50 |
* 10M input + 1.5M output tokens per month at list prices, no caching. Green = better value on that row.
Frequently asked questions
- Which is better, GLM-5.1 or GPT-5.2?
- These two models don't yet share verified results on the benchmarks we track, so judge them on specs, pricing and intended use. GLM-5.1 is about 2.2x cheaper per blended million tokens (3:1 input:output mix). GPT-5.2 also takes 400K of context versus 200K for GLM-5.1. And GLM-5.1 is open-weights (MIT), so it can be self-hosted — a structural advantage if data control or vendor independence matters.
- Which is cheaper, GLM-5.1 or GPT-5.2?
- GLM-5.1 costs $1.4/$4.4 per million input/output tokens, while GPT-5.2 costs $1.75/$14. For a typical workload of 10M input and 1.5M output tokens per month, that's $20.60 versus $38.50.
- Which model is better for coding, GLM-5.1 or GPT-5.2?
- We don't yet track SWE-bench Verified results for both models; check their individual pages for coding-related scores.