Gpt 5.4 API

US OpenAI

Try in Playground → Get API key

Gpt 5.4 is a general-purpose model from OpenAI. Available through the MeshTok unified API.

ImageReasoningTool UseJSON Mode

Pricing (official list, per 1M tokens)

Input

$2.50/M

Output

$15.00/M

Specifications

Context window400K tokens Input modalitiesImage StreamingYes APIOpenAI-compatible

How to use Gpt 5.4

Drop-in OpenAI replacement. Change only the base_url and model.

# Python -pip install openai
from openai import OpenAI

client = OpenAI(
    base_url="https://meshtok.com/v1",
    api_key="sk-your-MeshTok-key",
)

resp = client.chat.completions.create(
    model="openai/gpt-5.4",
    messages=[{"role":"user","content":"Hello!"}],
)
print(resp.choices[0].message.content)

# cURL
curl https://meshtok.com/v1/chat/completions \
  -H "Authorization: Bearer sk-your-MeshTok-key" \
  -H "Content-Type: application/json" \
  -d '{"model":"openai/gpt-5.4","messages":[{"role":"user","content":"Hello!"}]}'