OpenAI makes Decisions API GA, with claimed 10× speed over Responses API

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If you need typed answers from text and images, OpenAI's Decisions API is now generally available with gpt-6-luna. OpenAI claimed it was 10× faster than the Responses API when it announced the public beta. The GA release doubles the question limit per request and adds shared-input caching, image instructions, and structured-data input.

Here's what changed:

• Requests support up to 400 questions, up from the public-beta limit of 200.
• Shared input can be cached across requests to get prompt-cache discounts on repeated input.
• Images can appear in individual question instructions, so each question can carry its own image.
• Structured data can be sent through input_json.

Why care? You can batch more questions into each call and reuse shared context across requests at discounted prompt-cache rates.

Try it: Send a request to v1/decisions using gpt-6-luna.

Sources: developers.openai.com