GLM 5.3 Flash API
About
Build advanced reasoning agents with GLM 5.3 Flash, a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers cost-effective pricing at $0.15/1M input and $0.50/1M output tokens, native tool calling support, open weights architecture. Access GLM 5.3 Flash via the Fireworks AI API with up to 131K output tokens.
Capabilities
Input Modalities
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Output Modalities
text
Reasoning
Yes
Structured Output
Limits
Context Window
1.0M
Tokens
Input Limit
1.0M
Tokens
Max Output
131K
Tokens
Pricing
Standard (per 1M tokens)
Input
$0.15
Output
$0.50
Caching (per 1M tokens)
Read
$0.03
Frequently Asked Questions
GLM 5.3 Flash by Fireworks AI costs $0.15 per 1M input tokens and $0.50 per 1M output tokens. Cached reads cost $0.03 per 1M tokens.
Model Details
ID
accounts/fireworks/models/glm-5p3-flash
Provider
Fireworks AIFamily
glm-flash
Release Date
Aug 26, 2026
Knowledge Cutoff
N/A
API Integration
NPM Package
@ai-sdk/openai-compatible
Environment Variables
FIREWORKS_API_KEY
API Base URL
https://api.fireworks.ai/inference/v1/