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GLM 5.3 Flash

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

GLM-5.3-Flash is the first natively multimodal model in the GLM-5 series with 320B total parameters and 18B active parameters. It incorporates several architectural improvements over GLM-5.2 including a hybrid architecture, sharply reducing long-context serving costs while preserving precise long-context and Manifold-Constrained Hyper-Connections (mHC) to further improve scaling efficiency.

GLM 5.3 Flash API Features

Fine-tuning

Docs

GLM 5.3 Flash 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 Flash 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 Flash on dedicated GPUs with Fireworks' high-performance serving stack with high reliability and no rate limits.

Available Serverless

$0.15 / $0.03 / $0.50

Run queries immediately, pay only for usage

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

Metadata

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

Specifications

Calibrated
No
Mixture-of-Experts
Yes
Parameters
320B

Supporting Functionality

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