GLM 5.2 vs Sonar Reasoning Pro: side-by-side summary

GLM 5.2 and Sonar Reasoning Pro are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.

GLM 5.2, from Z.ai, has a 1,048,576-token context window and is priced at $0.308/M tokens input, $0.968/M tokens output on OpenRouter.

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.

Context window

• GLM 5.2: 1,048,576 tokens
• Sonar Reasoning Pro: 128,000 tokens

Price

• GLM 5.2: $0.308/M tokens input, $0.968/M tokens output
• Sonar Reasoning Pro: $2/M tokens input, $8/M tokens output

Provided by

• GLM 5.2: Z.ai
• Sonar Reasoning Pro: Perplexity

• GLM 5.2 model details, providers and pricing
• Sonar Reasoning Pro model details, providers and pricing