GLM-5.3 Flash Flex API
About
Build advanced reasoning agents with GLM-5.3 Flash Flex, a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers cost-effective pricing at $0.10/1M input and $0.33/1M output tokens, native tool calling support, open weights architecture. Access GLM-5.3 Flash Flex via the Neuralwatt API with up to 1.0M 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
1.0M
Tokens
Pricing
Standard (per 1M tokens)
Input
$0.10
Output
$0.33
Caching (per 1M tokens)
Read
$0.02
Frequently Asked Questions
GLM-5.3 Flash Flex by Neuralwatt costs $0.10 per 1M input tokens and $0.33 per 1M output tokens. Cached reads cost $0.02 per 1M tokens.
Model Details
API Integration
NPM Package
@ai-sdk/openai-compatible
Environment Variables
NEURALWATT_API_KEY
API Base URL
https://api.neuralwatt.com/v1