GPT-5.4 Mini API
About
Build advanced reasoning agents with GPT-5.4 Mini, a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers cost-effective pricing at $0.0000/1M input and $0.0000/1M output tokens, native tool calling support. Access GPT-5.4 Mini via the OpenRouter API with up to 128K output tokens.
Capabilities
Input Modalities
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Output Modalities
text
Reasoning
Yes
Structured Output
Yes
Tool Use
Yes
WeightsClosed
Temperature
Adjustable
Attachment
Supported
Limits
Context Window
400K
Tokens
Input Limit
400K
Tokens
Max Output
128K
Tokens
Pricing
Standard (per 1M tokens)
Input
$0.0000
Output
$0.0000
Caching (per 1M tokens)
Read
$0.0000
Frequently Asked Questions
GPT-5.4 Mini by OpenRouter costs $0.0000 per 1M input tokens and $0.0000 per 1M output tokens. Cached reads cost $0.0000 per 1M tokens.
Model Details
ID
openai/gpt-5.4-mini
Provider
OpenRouterFamily
gpt-mini
Release Date
Mar 17, 2026
Knowledge Cutoff
Aug 31, 2025
API Integration
NPM Package
@openrouter/ai-sdk-provider
Environment Variables
OPENROUTER_API_KEY
API Base URL
https://openrouter.ai/api/v1