gpt-5.4

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Integration guide

Overview

gpt-5.4 is available on MAX through the OpenAI-compatible API.

Pricing

Official list prices: token prices are per 1M tokens.

Input ≤ 271,999 tokens

Input: $2.5
Output: $15
Cache read: $0.25

Input > 271,999 tokens

Input: $5
Output: $22.5
Cache read: $0.5

Tier	Input	Output	Cache read
Input ≤ 271,999 tokens	$2.5	$15	$0.25
Input > 271,999 tokens	$5	$22.5	$0.5

This model uses tiered pricing: the tier is chosen by the total input length of each request.

Cache read applies to prompt tokens served from the prompt cache; cache write applies to tokens written into it.

Example request

curl https://api.link-io.cloud/v1/chat/completions \
  -H "Authorization: Bearer $API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-5.4",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'