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GLM-5.3

Ready
model path:accounts/fireworks/models/glm-5p3

GLM-5.3 uses the same base model as GLM-5.2 — every gain comes from post-training. Compared with GLM-5.2, it is much better at complex coding and long-horizon tasks

GLM-5.3 API Features

Fine-tuning

Docs

GLM-5.3 can be customized with your data to improve responses. Fireworks uses LoRA to efficiently train and deploy your personalized model

Serverless

Docs

GLM-5.3 is available via Fireworks' serverless API, where you pay per token. There are several ways to call the Fireworks API, including Fireworks' Python client, the REST API, or OpenAI's Python client.

On-demand Deployment

Docs

On-demand deployments allow you to use GLM-5.3 on dedicated GPUs with Fireworks' high-performance serving stack with high reliability and no rate limits.

Available Serverless

$1.40 / $0.26 / $4.40

Run queries immediately, pay only for usage

Per 1M Tokens (input/cached input/output)

Metadata

State
Ready
Created on
28 AUG, 2026
Kind
Base model
Provider
Z.ai
Huggingface

Specifications

Calibrated
No
Mixture-of-Experts
Yes
Parameters
743B

Supporting Functionality

Fine-tuning
Supported
Serverless
Supported
Context Length
1040k tokens
Function Calling
Supported
Embeddings
Not Supported
Rerankers
Not Supported
Supporting image input
Not Supported

GLM-5.3 FAQs

GLM-5.3 is Z.ai’s flagship model, released August 18, 2026. It shares GLM-5.2’s base model, with all gains coming from post-training, chiefly in complex coding and long-horizon tasks.

GLM-5.3 API & Playground | Fireworks AI