GPT-5.1 vs GLM 4.6: side-by-side summary

GPT-5.1 and GLM 4.6 are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.

GPT-5.1, from OpenAI, has a 400,000-token context window and is priced at $1.25/M tokens input, $10/M tokens output on OpenRouter.

GLM 4.6, from Z.ai, has a 204,800-token context window and is priced at $0.43/M tokens input, $1.75/M tokens output on OpenRouter.

Context window

• GPT-5.1: 400,000 tokens
• GLM 4.6: 204,800 tokens

Price

• GPT-5.1: $1.25/M tokens input, $10/M tokens output
• GLM 4.6: $0.43/M tokens input, $1.75/M tokens output

Provided by

• GPT-5.1: OpenAI
• GLM 4.6: Z.ai

• GPT-5.1 model details, providers and pricing
• GLM 4.6 model details, providers and pricing