GPT-5.3-Codex-Spark on OpenAI API

Name: GPT-5.3-Codex-Spark on OpenAI API
Brand: OpenAI

Serverless

Last refreshed 2026-06-04. Next refresh: weekly.

Why use GPT-5.3-Codex-Spark on OpenAI API?

OpenAI API offers GPT-5.3-Codex-Spark with competitive pricing. OpenAI is a leading AI research and deployment company dedicated to developing safe and beneficial artificial general intelligence (AGI) for humanity.

Input / 1M

Output / 1M

Cache

Not sourced

Batch

Not sourced

Setup recipe

Python + curl

Install

pip install openai

Auth

export OPENAI_API_KEY=...

Call

import os
from openai import OpenAI
client = OpenAI()  # reads OPENAI_API_KEY from env
response = client.chat.completions.create(

Model ID

gpt-5.3-codex-spark

Request example

import os
from openai import OpenAI

client = OpenAI()  # reads OPENAI_API_KEY from env
response = client.chat.completions.create(
    model="gpt-5.3-codex-spark",
    messages=[{"role": "user", "content": "Hello"}]
)
print(response.choices[0].message.content)

Gotchas

Use the model slug directly, e.g. "gpt-4o" or "gpt-4.1-mini".
The examples expect OPENAI_API_KEY; rename it only if your application config maps the new variable.

Capabilities

Function CallingTool UseStructured OutputsCode Execution

About GPT-5.3-Codex-Spark

ChatGPT Pro research preview using Cerebras hardware for real-time coding at 1000+ tokens/second. Not available as a standard public OpenAI API model.