GLM-5.3 FlashX - MixRoute API

Faster-serving GLM-5.3 Flash variant for multimodal coding and long-running agents.

Model Information

Field	Description
`model`	glm-5.3-flashx
`context`	1M tokens
`max output`	128K tokens
`endpoint`	POST /v1/chat/completions

Context and output sizes describe the model specification. Effective request limits, availability, and billing depend on the MixRoute route.

Capabilities and Usage

The model supports native text, image, video, and file understanding and produces text. Input transport depends on the API route.
Thinking cannot be disabled: thinking.type supports enabled only. Images in Chat Completions use messages[].content[] blocks with type=image_url and image_url.url.
FlashX is a separate model ID from glm-5.3-flash; throughput depends on the serving route and workload.

Request Example

Set MIXROUTE_API_KEY before making the request.

curl --request POST "https://api.mixroute.ai/v1/chat/completions" \
  --header "Authorization: Bearer $MIXROUTE_API_KEY" \
  --header "Content-Type: application/json" \
  --data '{
  "model": "glm-5.3-flashx",
  "messages": [
    {
      "role": "user",
      "content": "Explain the tradeoffs of database indexes."
    }
  ],
  "max_tokens": 1024
}'

Request Fields

Field	Description
`model`	Required. Use the exact model ID above.
`messages`	Required conversation messages with role and content.
`max_tokens`	Optional output-token budget.

Complete request format: chat-openai.