GPT-5.3-Codex-Spark is free on xKiro: OpenAI’s fastest coding model

GPT-5.3-Codex-Spark — OpenAI's ultra-low-latency variant of GPT-5.3-Codex — is now free on xKiro through the same OpenAI-compatible API you already use. Built for interactive coding: targeted edits, quick logic changes and instant iteration, with a 128K context window, native tool calling and four reasoning levels (low to xhigh). Text input only. Call it as openai/gpt-5.3-codex-spark on /v1/chat/completions with no new setup.

Models included

• openai/gpt-5.3-codex-spark

How to use it

Point any OpenAI- or Anthropic-compatible SDK at the xKiro gateway and pass the model id above. Nothing else changes — the price applies automatically on every call, with no coupon code and no plan change.