Muse Spark 1.3 Contributor vs GLM 5.3 Flash

Muse Spark 1.3 Contributor vs GLM 5.3 Flash: which AI model is cheaper, has the larger context window and more capabilities? Side-by-side comparison updated daily.

Quick verdict

  • Muse Spark 1.3 Contributor is 1.9× cheaper than GLM 5.3 Flash for the same mix of input and output tokens.
  • Both have the same context window.
  • Muse Spark 1.3 Contributor is the more recent release (Sep 2, 2026).
  • Only GLM 5.3 Flash has openly published weights you can run yourself.
  • Choose Muse Spark 1.3 Contributor if cost matters most; choose GLM 5.3 Flash if you need its specific strengths above. For the best results, test both on your own prompts.
Muse Spark 1.3 ContributorGLM 5.3 Flash
CompanyMetaZ.ai (Zhipu)
ReleasedSep 2, 2026 ●Aug 26, 2026
Overall index—151.9
GPQA Diamond—90.2%
AIME math—93.9%
FrontierMath—55.8%
Input (per 1M tokens)$0.10 ●$0.15
Output (per 1M tokens)$0.20 ●$0.50
Cost for 1M input + 1M output tokens$0.30 ●$0.65
Providers133 ●
Context1M1M
Max output944K ●944K
InputsText, Image, Video, Files ●Text, Image, Video
OutputsTextText
Reasoning✓✓
Tool use✓✓
Structured output✓✓
Open weights—✓

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