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GLM 5.3 Flash

glm-5.3-flashAvailable

Z.ai's fast, low-cost GLM 5.3 Flash. Suited to high-volume chat, drafting, and agent steps.

Specs and pricing

Model IDglm-5.3-flash
Context1,048,576 tokens
Max output8,192 tokens
Default output1,024 tokens
Input price$0.06 per 1M tokens
Cached input price$0.035 per 1M tokens
Output price$0.23 per 1M tokens
API compatibilityOpenAI Chat Completions, OpenAI Responses, Anthropic Messages
Tool callingYes
JSON response formatYes

Quickstart

Set REDROUTER_API_KEY to a key from API Keys.

Base URL
https://redrouter.org/v1
Model ID
glm-5.3-flash
curl 'https://redrouter.org/v1/chat/completions' \
  -H "Authorization: Bearer $REDROUTER_API_KEY" \
  -H 'Content-Type: application/json' \
  -d '{"messages":[{"content":"Hello","role":"user"}],"model":"glm-5.3-flash"}'

Supported parameters

Other parameters are rejected with HTTP 400. The user field is accepted for compatibility and is not forwarded.

modelmessagesstreamstream_optionsmax_tokensmax_completion_tokenstemperaturetop_pstoppresence_penaltyfrequency_penaltyseedtoolstool_choiceparallel_tool_callsresponse_formatuserreasoning_effortreasoningenable_thinkingthinkingthinking_budgetchat_template_kwargsoutput_config

Request fields and limits

Deployment

Routing
Your request runs on the model you named. RedRouter does not substitute a different model.

Model version

As reported by the hosting provider. RedRouter has not independently verified the served weights.

Weights
zai-org/GLM-5.3-Flash ↗
Revision
Not disclosed by host
License
Not disclosed by host
Quantization
NVFP4
Tokenizer
Not disclosed by host
Chat template
Not disclosed by host