Model error diagnosis

Z.ai: GLM 5.1 | context length exceeded

Z.ai: GLM 5.1 returning 400 / context length exceeded means you should first confirm whether model ID z-ai/glm-5.1 is visible for this Zhipu AI (GLM) key, then separate permission, context, capability, rate limit, or route issues.

Model

z-ai/glm-5.1

Z.ai: GLM 5.1

Provider

Zhipu AI (GLM)

13 models in catalog

Error type

context length exceeded

context-exceeded

Status code

400

China model route

Model error summary

Model

z-ai/glm-5.1

Error type

context-exceeded

Status code

400

Read-only check. Detection data burns after 5 minutes.

What this model error usually means

Z.ai: GLM 5.1 returning 400 / context length exceeded means you should first confirm whether model ID z-ai/glm-5.1 is visible for this Zhipu AI (GLM) key, then separate permission, context, capability, rate limit, or route issues.

Model: z-ai/glm-5.1
Provider: Zhipu AI (GLM)
Status code: 400

How to prove it during checking

Read-only check. Detection data burns after 5 minutes.

List models: confirm whether z-ai/glm-5.1 is actually visible instead of guessing from the display name.
Light probe: use minimal input to verify whether Zhipu AI (GLM) returns the same 400, then record the error body.
Compare model facts: context 202,752, input $0.950, output $3.15.
supports frequency_penalty
supports include_reasoning
supports logit_bias
supports logprobs

Next action

Z.ai: GLM 5.1 context length exceeded should not end at failed. Return the next move: change model ID, add permission, reduce context, disable unsupported capability, change route, monitor, or hold listing.

Context: 202,752
Price: $0.950 / $3.15
Read-only check. Detection data burns after 5 minutes.

Open key checker

Read-only check. Detection data burns after 5 minutes.