OpenAI's Decisions API generally available with gpt-6-luna
The Decisions API left beta with up to 400 questions per request and images in question instructions. The Responses API gained a 12-hour prompt caching option.

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The Decisions API left beta with up to 400 questions per request and images in question instructions. The Responses API gained a 12-hour prompt caching option.
Over the coming weeks, with no date given, OpenAI will add an invisible watermark to eligible ChatGPT and Codex text generated in the EU, under the AI Act.
OpenAI began rolling out GPT-6 in ChatGPT on October 7: Sol for paid plans, and Luna for Free and Go users from October 8.
Why it matters → If you are a student, an accountant or a small shop owner using ChatGPT on the Free or Go plan, OpenAI says you get GPT-6 Luna. Greece is not named: the company only says ‘globally’, and usage limits for Free and Go are not given. The sources do not state ChatGPT plan prices.