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llm-openai-decisions 0.1a0

Simon Willison released llm-openai-decisions 0.1a0, an LLM plugin for OpenAI's new Decisions API, which OpenAI announced at last week's DevDay. The plugin, built by GPT-6 Astra reading the OpenAI API documentation and inspired by Willison's llm-typesafe plugin for Jev, supports the same three question types as Jev (yes/no, choices, scores) and adds image input via the gpt-6-luna decision model. OpenAI charges 10 cents per million input tokens and nothing for output, versus Jev's 4.2 cents per million input tokens.

read1 min views1 publishedOct 6, 2026

Release: llm-openai-decisions 0.1a0

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.

Tags: openai, llm, coding-agents, jev

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