Poe API

GPT-5.3-Codex-Spark

Enabled by Cerebras’s custom high-performance chips, GPT 5.3 Codex Spark is OpenAI's lightweight coding model optimized for fast code generation (~1000 tokens / second). Supports a 128k context window. Poe users get early research preview access to GPT-5.3-Codex-Spark at near-zero cost. This bot supports optional parameters for additional customization.

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Build with GPT-5.3-Codex-Spark using the Poe API

Start by creating an API key, for use with any bot on Poe:

Generate API key

Use it in these apps

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Code samples

Responses API

import openai

client = openai.OpenAI(
    api_key = "YOUR_POE_API_KEY",  # or os.getenv("POE_API_KEY")
    base_url = "https://api.poe.com/v1",
)

response = client.responses.create(
    model = "gpt-5.3-codex-spark",
    input = "Write a Python function that reverses a string without using any built in string manipulation functions or libraries"
)

print(response.output_text)

See the full documentation for comprehensive guidance on getting started.