Sonar Reasoning Pro vs GLM 5.3 Flash: side-by-side summary

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

Sonar Reasoning Pro, from Perplexity, has a 128,000-token context window and is priced at $2/M tokens input, $8/M tokens output on OpenRouter.

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.

Context window

• Sonar Reasoning Pro: 128,000 tokens
• GLM 5.3 Flash: 1,048,576 tokens

Price

• Sonar Reasoning Pro: $2/M tokens input, $8/M tokens output
• GLM 5.3 Flash: $0.075/M tokens input, $0.25/M tokens output

Provided by

• Sonar Reasoning Pro: Perplexity
• GLM 5.3 Flash: Z.ai

• Sonar Reasoning Pro model details, providers and pricing
• GLM 5.3 Flash model details, providers and pricing