Codex 5.3 Spark

openai/gpt-5.3-codex-spark

GPT-5.3-Codex-Spark is a compact, ultra-low-latency variant of GPT-5.3-Codex built for interactive coding: targeted edits, quick logic changes, and fast iteration. Text-only, with a 128K context window.

Pricing

Specifications

Use Codex 5.3 Spark

Point your existing OpenAI SDK at xKiro and pass openai/gpt-5.3-codex-spark as the model. Nothing else in your code changes.

from openai import OpenAI

client = OpenAI(
    base_url="https://api.xkiro.com/v1",
    api_key="YOUR_XKIRO_KEY",
)

response = client.chat.completions.create(
    model="openai/gpt-5.3-codex-spark",
    messages=[{"role": "user", "content": "Hello"}],
)
print(response.choices[0].message.content)

Supported parameters

max_tokens · temperature · top_p · stop · frequency_penalty · presence_penalty · seed · stream · tools · tool_choice · response_format · structured_outputs · reasoning · include_reasoning

Related models

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• GPT-5.6 Sol$4.50
• GPT-5.6 Terra$1.00