GLM 5.3 Flash vs Muse Spark 1.2: side-by-side summary

GLM 5.3 Flash and Muse Spark 1.2 are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.

GLM 5.3 Flash, from Z.ai, has a 1,048,576-token context window and is priced at $0.075/M tokens input, $0.25/M tokens output on OpenRouter.

Muse Spark 1.2, from Meta, has a 1,048,576-token context window and is priced at $1.25/M tokens input, $4.25/M tokens output on OpenRouter.

Context window

• GLM 5.3 Flash: 1,048,576 tokens
• Muse Spark 1.2: 1,048,576 tokens

Price

• GLM 5.3 Flash: $0.075/M tokens input, $0.25/M tokens output
• Muse Spark 1.2: $1.25/M tokens input, $4.25/M tokens output

Provided by

• GLM 5.3 Flash: Z.ai
• Muse Spark 1.2: Meta

• GLM 5.3 Flash model details, providers and pricing
• Muse Spark 1.2 model details, providers and pricing