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FastRouter

GPT-5.4 mini API

FastRouter
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 FastRouter API with up to 128K output tokens.

Capabilities

Input Modalities

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Output Modalities

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Reasoning
Yes
Structured Output
Yes
Tool Use
Yes
WeightsClosed
Temperature
Fixed
Attachment
Supported
Limits
Context Window
400K

Tokens

Input Limit
272K

Tokens

Max Output
128K

Tokens

Pricing

Standard (per 1M tokens)

Input
$0.75
Output
$4.50
Frequently Asked Questions

GPT-5.4 mini by FastRouter costs $0.75 per 1M input tokens and $4.50 per 1M output tokens.

Model Details
ID
openai/gpt-5.4-mini
Provider
FastRouter
Family
gpt-mini
Release Date
Mar 17, 2026
Knowledge Cutoff
Aug 31, 2025
API Integration
NPM Package
@ai-sdk/openai-compatible
Environment Variables
FASTROUTER_API_KEY
API Base URL
https://go.fastrouter.ai/api/v1
Documentation