Poe API

GPT-5.3-Codex

OFFICIAL

GPT‑5.3‑Codex excels in software development. It understands complex codebases, provides accurate completions, explains algorithms, and assists with debugging across modern programming languages. Designed for developers, it elevates productivity and supports full‑stack coding workflows with precision. Supports 400k tokens of input context. This bot supports optional parameters for additional customization.

Build with GPT-5.3-Codex using the Poe API

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

Generate API key

Use it in these bots

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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",
    input = "Write a C++ function that checks if a string is a palindrome"
)

print(response.output_text)

See the full documentation for comprehensive guidance on getting started.