Model comparison

GLM-5 vs GLM-5.1

Compare GLM-5 (Z Ai) and GLM-5.1 (Z Ai) by price, context, capabilities, and latency.

Which should you pick?

Price: GLM-5 is cheaper ($0.58 / 1M tokens input / $2.58 / 1M tokens output) vs GLM-5.1 ($0.83 / 1M tokens input / $3.31 / 1M tokens output).
Context: GLM-5.1 has the larger context window (202k tokens).

Side by side

GLM-5 vs GLM-5.1 — full comparison

Compare price, provider, context, capabilities, latency, and source basis.

Model	Provider	Input	Output	Context	Capabilities	Best for	Latency	Status	Source
GLM-5z-ai/glm-5	Z Ai	Starting at $0.58 / 1M tokens	$2.58 / 1M tokens	198k	StreamingTool callingJSON modeLong context	General chat via Z Ai, API workloads	1431-2367ms	Catalog	Platform curated
GLM-5.1z-ai/glm-5.1	Z Ai	Starting at $0.83 / 1M tokens	$3.31 / 1M tokens	202k	StreamingTool callingJSON modeLong context	General chat via Z Ai, API workloads	1419-2162ms	Catalog	Platform curated

FAQ

GLM-5 vs GLM-5.1 FAQ

Is GLM-5 or GLM-5.1 cheaper?

GLM-5 is cheaper ($0.58 / 1M tokens input / $2.58 / 1M tokens output) vs GLM-5.1 ($0.83 / 1M tokens input / $3.31 / 1M tokens output). Actual cost depends on your input/output token mix — estimate it with the pricing calculator.

Which has a larger context window, GLM-5 or GLM-5.1?

GLM-5.1 is larger (202k tokens) vs 198k tokens.

GLM-5 vs GLM-5.1 for Long context: which should I pick?

Both target Long context. Pick GLM-5 to optimize cost, or GLM-5.1 for the longer context window. Test both on real prompts before committing production traffic.

GLM-5 details GLM-5.1 details Pricing calculator OpenAI-compatible quickstart