In short
How they differ.
Worked out from the figures below. Prices and specs are the makers' own, read Oct 20, 2026.
- GLM-5.3 reads more at once: a context window of 1M tokens against 128K.
- Both can be downloaded and run on your own machine.
- No independent board we follow ranks both models yet.
Side by side
The specs.
| GLM-5.3 | gpt-oss-120b | |
|---|---|---|
| Made by | Z.ai (Zhipu AI) · China | OpenAI · US |
| Released | Not stated | Aug 5, 2025 |
| Price per 1M tokens | $1.40 in / $4.40 out | Free to download; hosts set prices |
| Context window | 1M | 128K |
| Takes in | text | text |
| Download and run it yourself | Yes (glm-5.3 (license tag shown on Hugging Face)) | Yes (Apache 2.0) |
| Size | 753B (Hugging Face safetensors size field) parameters | 117B parameters, 5.1B active |
| Maker says | “GLM-5.3 is Z.ai's latest flagship model, delivering comprehensive advancements in complex software engineering” | “production, general purpose, high reasoning use cases” |
| Sources | Prices, Oct 20, 2026 · Description | Prices, Oct 20, 2026 · Description |
Independent tests
Where they place.
Position on each board we follow (1 is best). Epoch AI's and Vectara's scores are shown; the other boards are linked for their own figures.
| Board | GLM-5.3 | gpt-oss-120b |
|---|---|---|
| Epoch Capabilities IndexEpoch AI, Oct 20, 2026 | #30155.91 | Not listed |
| Humanity's Last ExamScale AI | #15 | Not listed |
| SWE-Bench ProScale AI, Sep 22, 2026 | #9 | Not listed |
| Vals IndexVals AI, Oct 19, 2026 | #9 | Not listed |
| Terminal-Bench 4.0Vals AI, Oct 19, 2026 | #12 | Not listed |
| Vectara hallucination testVectara, Oct 16, 2026 | Not listed | #9214.2% |
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