2026-10-06 23:04 UTCOriginal source1 min readUpdated: 2026-10-07 00:48 UTC

llm-openai-decisions 0.1a0

Summary

Simon Willison released llm-openai-decisions 0.1a0, an LLM plugin for OpenAI's new Jev-style Decisions API. Built with GPT-6 Astra reading the official docs and modeled on his earlier llm-typesafe plugin, it supports yes/no, choice, and score questions, and its gpt-6-luna model accepts image input as well as text.

SourceSimon Willison's Weblog

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Release: llm-openai-decisions 0.1a0

Simon Willison’s Weblog

6th October 2026

Release

llm-openai-decisions 0.1a0 — LLM plugin for the OpenAI Decisions API

OpenAI released their new Jev-style Decisions API, as previously announced at last week's DevDay.

Since I already have an llm-typesafe plugin for talking to Jev, I had GPT-6 Astra read the new OpenAI API documentation and build an llm-openai-decisions plugin inspired by llm-typesafe.

Unlike Jev, the new gpt-6-luna decision model supports image input in addition to text. Both models charge for input it and not for output: OpenAI's is 10 cents per million input tokens, Jev's is 4.2 cents per million.

Otherwise the API shape is very similar to Jev, at least conceptually. Jev supports three question types for yes/no, choices, or scores. OpenAI Decisions supports the same three types.

Install the plugin like this:

llm install llm-openai-decisions

Here's an example query against an image attachment:

llm -m openai-decisions/gpt-6-luna \ -a https://static.simonwillison.net/static/2025/two-pelicans.jpg \ -s 'Does this image contain any mammals?'

And example output:

{"type": "predicate", "name": "evaluation", "probability": 0.0}

Consult the README for full details of how to run the other types of questions.

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Key points

OpenAI shipped its Jev-style Decisions API, previously announced at DevDay, and Simon Willison quickly followed with the llm-openai-decisions 0.1a0 plugin.
The plugin was generated by having GPT-6 Astra read the new API documentation, using the existing llm-typesafe plugin as inspiration.
gpt-6-luna adds image input on top of text; both OpenAI and Jev charge only for input tokens, at 10 cents and 4.2 cents per million respectively.
Like Jev, the API supports three question types: yes/no, choices, and scores.

Highlights and analysis are generated automatically and may contain errors. Check the original source.

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