Muse Spark 1.2 vs Muse Spark Open vs GLM-5.3

Muse Spark 1.2 is the better all-round choice, scoring 71/100 against Muse Spark Open (68) and GLM-5.3 (63). It leads on inputs & features. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

Muse Spark 1.2 is cheaper at $1.25 input / $4.25 output per million tokens (official Meta API price). Muse Spark Open costs $1.25 input / $4.25 output per million tokens (median across 16 API providers); GLM-5.3 costs $1.40 input / $4.40 output per million tokens (official Z.AI API price). At a typical mix of three input tokens to one output token, that is $2.00 per million tokens for Muse Spark 1.2 versus $2.00 for Muse Spark Open (1× as much) and $2.15 for GLM-5.3 (1.1× as much).

GLM-5.3 scores higher on the Capabilities Index (ECI): GLM-5.3 156.2 (#33 of 165), Muse Spark 1.2 155.2 (#38 of 165) and Muse Spark Open 155.1 (#39 of 165). The confidence ranges of the top two overlap (154.3–158.5 vs 152.9–157.6), so treat the gap as small. On individual benchmarks: SimpleQA Verified — Muse Spark 1.2 60.3%, Muse Spark Open 56.6%, GLM-5.3 41.0%.

There are no published SWE-bench Verified results for Muse Spark 1.2, Muse Spark Open and GLM-5.3 yet, so there is no like-for-like coding score. On overall capability, GLM-5.3 leads, which tends to carry over to coding, but test on your own codebase. All three support tool calling for agent workflows.

Muse Spark 1.2 and Muse Spark Open have the largest context windows (1,048,576 and 1,048,576 tokens), against 1,000,000 for GLM-5.3. Maximum output per response: Muse Spark 1.2 up to 131,072, Muse Spark Open up to 131,072, GLM-5.3 up to 131,072 tokens.

Muse Spark 1.2 accepts text, images, PDFs, audio and video; Muse Spark Open accepts text, images, audio and video; GLM-5.3 accepts text. Muse Spark 1.2 handles the widest range of inputs.

Muse Spark Open and GLM-5.3 publishes its weights (Muse Model License) and can be self-hosted; Muse Spark 1.2 is proprietary.

Muse Spark Open is the newest, released Oct 15, 2026. GLM-5.3 came out Aug 14, 2026; Muse Spark 1.2 came out Aug 5, 2026. Knowledge cutoff: Muse Spark Open Jan 4, 2026.

Each model gets a 0–100 score on capability (50%, independent benchmark results); price (25%, blended price per million tokens (3 input : 1 output), log scale); inputs & features (15%, image, PDF, audio and video input, tool calling, structured output and reasoning); context window (10%, maximum tokens per request, log scale). Dimensions missing for any model are dropped and the remaining weights rescaled, so every model is judged on the same evidence. Specs and prices come from public model listings and the labs’ own API pages; capability scores come from independent benchmark runs. Data updated Nov 2, 2026.