GLM-5.3 API

zhipu/glm-5.3
GLM-5.3 is Zhipu AI's newest flagship model, offering a 1M-token context window with deep, tunable reasoning and full parallel tool-calling support for building advanced agents.
Context
1000K tokens
Input
$1.82 / 1M tokens
Output
$5.72 / 1M tokens
Released
Aug 17, 2026

How to use GLM-5.3 API

Install any OpenAI-compatible SDK, point it at api.aimlapi.com/v1, and set the model to zhipu/glm-5.3.

import requests

r = requests.post(
   "https://api.aimlapi.com/v1/chat/completions",
   headers={"Authorization": "Bearer " + AIMLAPI_KEY},
   json={
     "model": "zhipu/glm-5.3",
     "messages": [
       {
         "role": "user",
         "content": "Hello!"
       }
     ]
   },
)
print(r.json())

const r = await fetch("https://api.aimlapi.com/v1/chat/completions", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${process.env.AIMLAPI_KEY}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    "model": "zhipu/glm-5.3",
    "messages": [
      {
        "role": "user",
        "content": "Hello!"
      }
    ]
  }),
});
console.log(await r.json());
curl -X POST https://api.aimlapi.com/v1/chat/completions \
  -H "Authorization: Bearer $AIMLAPI_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"zhipu/glm-5.3","messages":[{"role":"user","content":"Hello!"}]}'

OpenAI-compatible — swap the base URL and it works with your existing SDK.

GLM-5.3 API Pricing

TypePrice
Input
$1.82 / 1M tokens
Output
$5.72 / 1M tokens
Cached input
$0.338 / 1M tokens

GLM-5.3 Benchmarks

BenchmarkScoreWhat it measuresSourceRetrieved
Intelligence
44.9
Composite score across standardised reasoning, knowledge and problem-solving evaluations, measured independently by Artificial AnalysisSourceSeptember 12, 2026
Coding
74.8
Composite score across standardised coding evaluations, measured independently by Artificial AnalysisSourceSeptember 12, 2026

GLM-5.3 vs other models

ModelInputOutputContextBest for
GLM-5.3
This page
$1.82 / 1M tokens
$5.72 / 1M tokens
1000K tokens
Reasoning + agents
$6.5 / 1M tokens
$39 / 1M tokens
1M tokens
Reasoning + agents
$2.6 / 1M tokens
$13 / 1M tokens
1M tokens
Balanced coding + agents
$3.9 / 1M tokens
$19.5 / 1M tokens
1M tokens
Long-context, multimodal & agentic workflows
$1.95 / 1M tokens
$11.7 / 1M tokens
1M tokens
Reasoning + agents

Frequently asked questions

GLM-5.3 has a 1,024,000 tokens context window and can return up to 131,072 tokens.

GLM-5.3 takes text as input and returns text.

Use zhipu/glm-5.3 as the model id. Requests go to https://api.aimlapi.com/v1/chat/completions.

GLM-5.3 became available on August 17, 2026.

GLM-5.3 is priced at input $1.82 / 1M tokens, output $5.72 / 1M tokens, cached input $0.338 / 1M tokens.

Yes, GLM-5.3 can stream responses as they are generated.

GLM-5.3 was built by Zhipu AI.

Start building with GLM-5.3

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