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.
StartLux's decision family in five sizes, 0.8B to 27B. All questions in a request are answered in one forward pass, with a probability for every option, through a TypeSafe /v1/systemone-compatible server that records CUDA graphs for short requests.
Decides
choice, classify, route
choice, score, noul
Architecture
gpt-6-luna
startlux-decision
Fine-tuned from
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License
proprietary
cc-by-nc-4.0
Availability
Hosted API
Open weights
Hosted by
OpenAI
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Input price
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Decision accuracy
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88.3%
Calibration error
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Valid action rate
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Median latency
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26 ms
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 startlux-decision?
decisions-api is from OpenAI and startlux-decision from StartLux. decisions-api is only available as a hosted API; startlux-decision has open weights you can download and run. Both answer choice questions. Only decisions-api answers classify and route. Only startlux-decision answers score and noul. decisions-api is licensed proprietary; startlux-decision, cc-by-nc-4.0.
Which is more accurate, decisions-api or startlux-decision?
Only startlux-decision publishes an accuracy figure (88.3% on JevBench public set (231 items; 204 correct), maker's run); decisions-api does not, so there is no comparison to make without your own test.
Which is cheaper, decisions-api or startlux-decision?
decisions-api: Hosted, price not published. startlux-decision: Free (open weights). Open weights cost nothing per call beyond your own hardware.
Can I run decisions-api or startlux-decision locally?
startlux-decision yes — systemone pull startlux/startlux-decision downloads its weights. The other is only served as a hosted API.
Evaluation suite
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JevBench public set (231 items; 204 correct), maker's run
