Model error diagnosis

Z.ai: GLM 4.5 Air (free) | context length exceeded

Z.ai: GLM 4.5 Air (free) returning 400 / context length exceeded means you should first confirm whether model ID z-ai/glm-4.5-air:free is visible for this Zhipu AI (GLM) key, then separate permission, context, capability, rate limit, or route issues.

Model

z-ai/glm-4.5-air:free

Z.ai: GLM 4.5 Air (free)

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-4.5-air:free

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 4.5 Air (free) returning 400 / context length exceeded means you should first confirm whether model ID z-ai/glm-4.5-air:free is visible for this Zhipu AI (GLM) key, then separate permission, context, capability, rate limit, or route issues.

Model: z-ai/glm-4.5-air:free
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-4.5-air:free 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 131,072, input $0.000, output $0.000.
supports include_reasoning
supports max_tokens
supports reasoning
supports temperature

Next action

Z.ai: GLM 4.5 Air (free) 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: 131,072
Price: $0.000 / $0.000
Read-only check. Detection data burns after 5 minutes.

Open key check

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

Open models

Z.ai: GLM 4.5 Air (free)

Open providers

Zhipu AI (GLM)