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 $0.75/1M input and $4.50/1M output tokens, native tool calling support. Access GPT-5.4 Mini via the Merge Gateway API with up to 128K output tokens.
Capabilities
Input Modalities
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Output Modalities
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Limits
Context Window
400K
Tokens
Input Limit
272K
Tokens
Max Output
128K
Tokens
Pricing
Standard (per 1M tokens)
Input
$0.75
Output
$4.50
Caching (per 1M tokens)
Read
$0.07
Frequently Asked Questions
GPT-5.4 Mini by Merge Gateway costs $0.75 per 1M input tokens and $4.50 per 1M output tokens. Cached reads cost $0.07 per 1M tokens.
Model Details
ID
openai/gpt-5.4-mini
Provider
Merge GatewayFamily
gpt-mini
Release Date
Mar 17, 2026
Knowledge Cutoff
Aug 31, 2025
API Integration
NPM Package
merge-gateway-ai-sdk-provider
Environment Variables
MERGE_GATEWAY_API_KEY
API Base URL
https://api-gateway.merge.dev/v1/ai-sdk