In short
How they differ.
Worked out from the figures below. Prices and specs are the makers' own, read Oct 20, 2026.
- Muse Spark 1.3 is cheaper per output token: $4.25 against $4.40 per million tokens, so GLM-5.3 costs 1 times as much.
- Muse Spark 1.3 reads more at once: a context window of 1M tokens against 1M.
- GLM-5.3 can be downloaded and run on your own machine; Muse Spark 1.3 can't.
- On the 2 independent boards that rank both, Muse Spark 1.3 places higher on 2 and GLM-5.3 on 0.
Side by side
The specs.
| GLM-5.3 | Muse Spark 1.3 | |
|---|---|---|
| Made by | Z.ai (Zhipu AI) · China | Meta · US |
| Released | Not stated | Not stated |
| Price per 1M tokens | $1.40 in / $4.40 out | $1.25 in / $4.25 out |
| Context window | 1M | 1M |
| Takes in | text | text, image, video, audio, pdf |
| Download and run it yourself | Yes (glm-5.3 (license tag shown on Hugging Face)) | No |
| Size | 753B (Hugging Face safetensors size field) parameters | Not published |
| Maker says | “GLM-5.3 is Z.ai's latest flagship model, delivering comprehensive advancements in complex software engineering” | “Muse Spark 1.3 is trained for agentic workflows and optimized for competitive coding performance.” |
| 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 | Muse Spark 1.3 |
|---|---|---|
| Epoch Capabilities IndexEpoch AI, Oct 20, 2026 | #30155.91 | #22156.76 |
| LMArena textLMArena, Oct 15, 2026 | Not listed | #10 |
| LMArena coding chatsLMArena, Oct 15, 2026 | Not listed | #15 |
| LMArena WebDevLMArena, Oct 19, 2026 | Not listed | #14 |
| LMArena mathLMArena, Oct 15, 2026 | Not listed | #11 |
| LMArena visionLMArena, Oct 19, 2026 | Not listed | #13 |
| LMArena documentsLMArena, Sep 13, 2026 | Not listed | #15 |
| LMArena Agent ArenaLMArena, Oct 19, 2026 | Not listed | #16 |
| Humanity's Last ExamScale AI | #15 | #12 |
| 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 |
| Vibe Code BenchVals AI, Oct 18, 2026 | Not listed | #14 |
| CUA-bench (games)Vals AI, Oct 13, 2026 | Not listed | #7 |
More comparisons