OpenAI Decisions API reaches general availability: up to 400 questions
The October 22 general release adds native JSON input and shared-input caching. This is not a new ChatGPT app feature.
Announced and generally available October 22, 2026, following the October 6 beta. GPT-6 Luna powers classification or routing through an API and web Playground; the per-request ceiling rises from 200 to 400 questions.
Per million input tokens: US$0.10 uncached and US$0.01 cache reads; writes cost extra, output is uncharged. Regional processing and long-context premiums may apply. This is separate from ChatGPT subscriptions. Feature-specific Traditional Chinese quality is unverified; we have not tested it.
Taiwan is API-supported, subject to account access and limits. Hong Kong and Macao are absent from the supported list. US/EU processing does not imply worldwide service eligibility.
https://openai.com/index/decisions-api/
https://developers.openai.com/api/docs/changelog
https://developers.openai.com/api/docs/guides/decisions
https://developers.openai.com/api/docs/supported-countries
Per million input tokens: US$0.10 uncached and US$0.01 cache reads; writes cost extra, output is uncharged. Regional processing and long-context premiums may apply. This is separate from ChatGPT subscriptions. Feature-specific Traditional Chinese quality is unverified; we have not tested it.
Taiwan is API-supported, subject to account access and limits. Hong Kong and Macao are absent from the supported list. US/EU processing does not imply worldwide service eligibility.
https://openai.com/index/decisions-api/
https://developers.openai.com/api/docs/changelog
https://developers.openai.com/api/docs/guides/decisions
https://developers.openai.com/api/docs/supported-countries
Usage conditions
- Hong Kong
- Hong Kong is not on the OpenAI API supported list; no workaround is provided.
- Macau
- Macao is not on the OpenAI API supported list; no workaround is provided.
- Taiwan
- Taiwan is API-supported; account, billing and rate limits apply. Not tested.
Official source: Build more responsive apps with the Decisions API