GLM-5.1

GLM-5.1 is a coding model from Z.ai (Zhipu, GLM) for agentic engineering, terminals, and repository generation. It is part of the glm line. It has a 200,000 token context window and a maximum output of 131,072 tokens. Weights are open. It supports reasoning mode and tool calling. It accepts text and returns text. Pricing starts at $0.45 per million input tokens and $2.15 per million output tokens, with cached input at $0.08 per million tokens.

Against GLM-5V-Turbo: input $0.7042 to $0.45, output $3.10 to $2.15, cached input $0.169 to $0.08.

Range across the hosts that serve it: up to $1.76 per 1M input tokens.

• ·200k token context window
• ·131k max output tokens
• ·Open weights for self-hosting
• ·Supports reasoning mode
• ·Supports tool calling

• Reach for it for agentic coding workflows
• Reach for it for terminal-based development
• Reach for it for repository generation
• Reach for it for long-context code analysis

48 hosts serve this model at the price above · the maker's documentation

The registry keeps the six most recent versions of a line. Older ones stay in the file and can be surfaced without a rebuild.

What is the context window?

The context window is 200,000 tokens.

Does it support tool calling?

Yes, it supports tool calling and reasoning mode.

What is the pricing?

From $0.45 per million input tokens and $2.15 per million output tokens, with cached input at $0.08 per million tokens.