Intel / article

llm-openai-decisions 0.1a0

Source: simonwillison.net
Date: Published Oct 6, 2026

Why it matters

OpenAI's Decisions API with gpt-6-luna returns probabilities for yes/no, choice and score questions and accepts images. Input costs 10 cents per million tokens and output is free. The plugin gives CLI access.

Key takeaways · AI-distilled

Unlike Jev, OpenAI's gpt-6-luna decision model accepts image input as well as text, Willison notes.
Both services bill only input and charge nothing for output: OpenAI at 10 cents per million input tokens, Jev at 4.2 cents per million.
OpenAI's API mirrors Jev's shape with the same three question types: yes/no predicates, choices and scores. A yes/no query returns a JSON object with a probability field.
Willison had GPT-6 Astra read OpenAI's new API documentation and build the plugin, modeled on his existing -typesafe plugin for Jev.

Terms in this piece · Glossary

LLM — A large language model — the neural network behind tools like Claude and ChatGPT, trained on huge amounts of text to predict what comes next.
token — The chunk of text a model reads and writes in — roughly three-quarters of a word — and the unit AI usage is billed in.

Read the source simonwillison.net