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.
Frontier Infra's open decision model. A LoRA merged into Qwen3.8-27B (thinking off) that answers one typed question per forward pass with a probability over the option labels, served through AINode's TypeSafe-compatible /v1/systemone.
Decides
choice, classify, route
choice, score, noul, classify, route
Architecture
gpt-6-luna
jebadiah
Fine-tuned from
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qwen/qwen3.8-27b
License
proprietary
apache-2.0
Availability
Hosted API
Open weights
Hosted by
OpenAI
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Input price
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Decision accuracy
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86.6%
Calibration error
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0.113
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 jebadiah?
decisions-api is from OpenAI and jebadiah from Frontier Infra. decisions-api is only available as a hosted API; jebadiah has open weights you can download and run. Both answer choice, classify and route questions. Only jebadiah answers score and noul. decisions-api is licensed proprietary; jebadiah, apache-2.0.
Which is more accurate, decisions-api or jebadiah?
Only jebadiah publishes an accuracy figure (86.6% on JevBench public set (231 items), maker's run with the v1.4.2 harness; ECE on the hard tier); decisions-api does not, so there is no comparison to make without your own test.
Which is cheaper, decisions-api or jebadiah?
decisions-api: Hosted, price not published. jebadiah: Free (open weights). Open weights cost nothing per call beyond your own hardware.
Can I run decisions-api or jebadiah locally?
jebadiah yes — systemone pull frontier-infra/jebadiah downloads its weights. The other is only served as a hosted API.
Evaluation suite
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JevBench public set (231 items), maker's run with the v1.4.2 harness; ECE on the hard tier
