Gemini 3.8 Flash vs GLM 5.3: side-by-side summary

Gemini 3.8 Flash and GLM 5.3 are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.

Gemini 3.8 Flash, from Google, has a 1,048,576-token context window and is priced at $0.75/M tokens input, $3.75/M tokens output on OpenRouter.

GLM 5.3, from Z.ai, has a 1,310,720-token context window and is priced at $1.15/M tokens input, $3.50/M tokens output on OpenRouter.

Context window

• Gemini 3.8 Flash: 1,048,576 tokens
• GLM 5.3: 1,310,720 tokens

Price

• Gemini 3.8 Flash: $0.75/M tokens input, $3.75/M tokens output
• GLM 5.3: $1.15/M tokens input, $3.50/M tokens output

Provided by

• Gemini 3.8 Flash: Google
• GLM 5.3: Z.ai

• Gemini 3.8 Flash model details, providers and pricing
• GLM 5.3 model details, providers and pricing