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
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Output / 1M
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Cache
Not sourced
Batch
Not sourced
Setup recipe
Python + curlInstall
pip install openaiAuth
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-sparkRequest 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
JSON / Tool 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.
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Model Specs
Released2026-02-12
Context131k
ArchitectureDecoder Only