GLM-5.3
GLM-5.3GLM-5.3 is Z.AI's latest model for agentic engineering, with stronger coding, long-horizon agentic capabilities, and emergent cybersecurity analysis.
Model details
GLM-5.3 is Z.AI's latest model for agentic engineering, with stronger coding, long-horizon agentic capabilities, and emergent cybersecurity analysis: all achieved through scaled post-training on the same base model as GLM-5.2.
GLM-5.3 runs on the same 744B-A40B MoE base as GLM-5.2, with every capability gain coming from scaled post-training across more diverse, realistic task environments: full codebases, documentation, testing tools, and multi-step workflows. The result is Z.AI's strongest coding model to date, with the largest jumps on the longest-horizon benchmarks: Terminal-Bench 3.0 moves from 4.6% to 28.3% over GLM-5.2, in addition to notable gains in vulnerability discovery and security analysis.
GLM-5.3 supports three thinking effort levels (low, high, and max, with max recommended for coding), making it a strong fit for agentic coding workflows that require sustained planning, implementation, and verification at production scale.
GLM-5.3 Agentic Coding Performance1# You can use this model with any of the OpenAI clients in any language!
2# Simply change the API Key to get started
3
4from openai import OpenAI
5
6client = OpenAI(
7 api_key="YOUR_API_KEY",
8 base_url="https://inference.baseten.co/v1"
9)
10
11response = client.chat.completions.create(
12 model="zai-org/GLM-5.3",
13 messages=[
14 {
15 "role": "user",
16 "content": "Implement Hello World in Python"
17 }
18 ],
19 stream=True,
20 stream_options={
21 "include_usage": True,
22 "continuous_usage_stats": True
23 },
24 top_p=1,
25 max_tokens=1000,
26 temperature=1,
27 presence_penalty=0,
28 frequency_penalty=0
29)
30
31for chunk in response:
32 if chunk.choices and chunk.choices[0].delta.content is not None:
33 print(chunk.choices[0].delta.content, end="", flush=True)1{
2 "id": "143",
3 "choices": [
4 {
5 "finish_reason": "stop",
6 "index": 0,
7 "logprobs": null,
8 "message": {
9 "content": "[Model output here]",
10 "role": "assistant",
11 "audio": null,
12 "function_call": null,
13 "tool_calls": null
14 }
15 }
16 ],
17 "created": 1741224586,
18 "model": "",
19 "object": "chat.completion",
20 "service_tier": null,
21 "system_fingerprint": null,
22 "usage": {
23 "completion_tokens": 145,
24 "prompt_tokens": 38,
25 "total_tokens": 183,
26 "completion_tokens_details": null,
27 "prompt_tokens_details": null
28 }
29}
