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.
A Situated World Model for fast judgment in agent loops.
Decides
choice, classify, route
choice, route, classify
Architecture
gpt-6-luna
trio-spark
Fine-tuned from
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License
proprietary
proprietary
Availability
Hosted API
Hosted API
Hosted by
OpenAI
MachineFi
Input price
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$0.042/MTok
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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Evaluation suite
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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 trio-spark-v1?
decisions-api is from OpenAI and trio-spark-v1 from MachineFi. Both are only available as a hosted API. Both answer choice, classify and route questions.
Which is more accurate, decisions-api or trio-spark-v1?
Neither publishes an accuracy figure. Test both on your own labelled examples.
Which is cheaper, decisions-api or trio-spark-v1?
decisions-api: Hosted, price not published. trio-spark-v1: $0.042 / $0 per 1M. Open weights cost nothing per call beyond your own hardware.
