OpenAI's decision endpoint, announced at DevDay 2026. It focuses GPT-6 Luna on developer-defined questions that have a finite set of predefined answers, with text or image context, for classification, routing and an agent's next action.
Invergent's decision model for text and images. A fine-tune of Gemma-4-26B-A4B (about 4B parameters active per token) that answers Choice, Noul and Score questions, with an optional thinking mode for harder questions.
Decides
choice, classify, route
choice, score, noul, classify, route
Architecture
gpt-6-luna
rune
Fine-tuned from
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google/gemma-4-26b-a4b-it
License
proprietary
apache-2.0
Availability
Hosted API
Open weights + hosted API
Hosted by
OpenAI
Invergent
Input price
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Decision accuracy
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Calibration error
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Valid action rate
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Median latency
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p95 latency
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Figures are from each model’s manifest; accuracy and latency are what the publishers report, on their own suites and hardware. Add a third model.
Questions
What is the difference between decisions-api and rune?
decisions-api is from OpenAI and rune from Surogate (Invergent). decisions-api is only available as a hosted API; rune has open weights and a hosted API. Both answer choice, classify and route questions. Only rune answers score and noul. decisions-api is licensed proprietary; rune, apache-2.0.
Which is more accurate, decisions-api or rune?
Neither publishes an accuracy figure. Test both on your own labelled examples.
Which is cheaper, decisions-api or rune?
decisions-api: Hosted, price not published. rune: Hosted, price not published, or free to self-host. Open weights cost nothing per call beyond your own hardware.
Can I run decisions-api or rune locally?
rune yes — systemone pull surogate/rune downloads its weights. The other is only served as a hosted API.
