GLM 5.1 vs Phi 4: side-by-side summary

GLM 5.1 and Phi 4 are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.

GLM 5.1, from Z.ai, has a 204,800-token context window and is priced at $0.9086/M tokens input, $2.856/M tokens output on OpenRouter.

Phi 4, from Microsoft, has a 16,384-token context window and is priced at $0.07/M tokens input, $0.14/M tokens output on OpenRouter.

Context window

• GLM 5.1: 204,800 tokens
• Phi 4: 16,384 tokens

Price

• GLM 5.1: $0.9086/M tokens input, $2.856/M tokens output
• Phi 4: $0.07/M tokens input, $0.14/M tokens output

Provided by

• GLM 5.1: Z.ai
• Phi 4: Microsoft

• GLM 5.1 model details, providers and pricing
• Phi 4 model details, providers and pricing