gpt-5.4· Released Mar 5, 2026

Name: gpt-5.4
Brand: openai

openai/gpt-5.4

GPT-5.4 is OpenAI’s latest frontier model, unifying the Codex and GPT lines into a single system. It features a 1M+ token context window (922K input, 128K output) with support for...

Input

From$2.0625/M

Output

From$12.375/M

Context

Up to 1.1M

Max output

Up to 128K

Modalities

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Input and output show the lowest price across upstreams, for reference. Your actual prices are listed per upstream below.

Upstreams & pricing

Upstream	Context	Max output	Input $/1M	Output $/1M	Cached input $/1M
Zenlayer AI Gateway-openai_compat (Global)From price	1.1M	128K	≤272K$2.0625 >272K$4.125	≤272K$12.375 >272K$18.5625	≤272K$0.20625 >272K$0.4125

Routed in real time — you pay the listed price of whichever upstream serves your call.

How to call

curlrequest.sh

curl https://api.tkex.ai/v1/chat/completions \
  -H "Authorization: Bearer $TX_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "openai/gpt-5.4",
    "messages": [
      {"role": "user", "content": "Say hello in five words."}
    ]
  }'