ModelClock
Capability change
Capability change announced Feb 12, 2026
OpenAI documents a capability change: “GPT-5.3-Codex-Spark isn’t available in the API at launch.”
- Hosting route
- First-party API
- Affected scope
- Not stated in the notice
- Announced
- Feb 12, 2026
- First seen by ModelClock
- Oct 7, 2026
What the provider published
learn.chatgpt.com ↗GPT-5.3-Codex-Spark isn’t available in the API at launch.
Read from the provider's text; the quote is the provider's exact lines.