Z.ai

GLM 5.3

Text

Latest GLM text model for OpenAI-compatible Chat Completions

Input $1.40 / 1M tokens | Output $4.40 / 1M tokens GLM 5.3 API reference →
Model health Insufficient data
curl -X POST https://runapi.ai/v1/chat/completions \
  -H "Authorization: Bearer $RUNAPI_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "glm-5.3",
  "messages": [
    {
      "role": "user",
      "content": "Read this multi-file repository, find the failing integration test, and propose a patch with an explanation of the root cause."
    }
  ]
}'
https://runapi.ai 1 endpoint
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Estimated: Input $1.40 / 1M tokens | Output $4.40 / 1M tokens

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Specifications

Technical details

Provider Z.ai
Model ID glm-5.3
Modality Text
Task types Synchronous
API endpoint /v1/chat/completions
Billing unit 1K tokens
Catalog status Operational
HOW IT WORKS

Use This Model in 3 Steps

  1. Get Your Key

    Sign up for free and create an API key for glm-5.3 from the dashboard.

  2. Send a Request

    POST to /v1/chat/completions with the glm-5.3 model slug and your parameters.

  3. Get Results

    Read the completed glm-5.3 response directly from the endpoint.

What this model offers

Endpoint coverage

Exposes 1 public endpoint(s): chat_completion.

Usage-based billing

Metered by 1K tokens with no subscription requirement.

GLM 5.3 Pricing

Endpoint
Resolution
Duration
Price
chat_completion
Not available
1K tokens
Input: $1.40 / 1M tokens Output: $4.40 / 1M tokens
  • Cache read: $0.26 / 1M tokens
  • Cache write 5m: Free / 1M tokens
  • Cache write 1h: Free / 1M tokens
API REFERENCE

Endpoint Specification

Endpoint
POST /v1/chat/completions
Model ID
glm-5.3
Task Types
chat_completion
Max Duration
Unavailable
Resolutions
Unavailable
Aspect Ratios
Unavailable
Output Format
Unavailable
Avg Generation Time
Unavailable

Request parameters

No request parameters are published for this endpoint.

USE CASES

Customer support

Answer customer questions from a private knowledge base, reducing ticket volume.

Document analysis

Draft contract summaries and flag key clauses for attorney review.

Code generation

Auto-generate unit tests, code reviews, and refactoring suggestions in CI.

FAQ

Frequently asked questions about GLM 5.3

How do I select glm-5.3?

Pass the model ID shown in the quickstart.

What's the rate limit on this variant?

Per-key rate limits scale with your usage tier. The pricing page shows current limits. If you need higher throughput, contact support to discuss tier upgrades.

Can I switch variants later?

Yes. Variant is a parameter in the request. Switch by changing the model ID — no code changes, no re-authentication, no separate billing setup. All variants share the same API key and request shape.

Does it stream?

Where streaming is available, RunAPI streams end-to-end. LLM models support token-level streaming. Media models use async task polling or webhook callbacks for result delivery.

Where do I report quality issues?

Open an issue on the public GitHub repo or email support at [email protected]. Include the task ID and model ID so the team can investigate the specific generation.

Do I need a separate provider account?

No. Your RunAPI API key is enough to access this variant and every other model in the catalog. You do not need accounts with the underlying provider.

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