# PostHog releases Jeeves decision model with reasoning option

_Published Tuesday, September 29, 2026 at 8:08 AM EDT · AI, Products · Latest · Tier 2 — Notable_

![Jeeves – Reasoning improves Jev-like decision models - PostHog/jeeves — Primary](https://opengraph.githubassets.com/bd32802a26df1c214b00d4b1652dbfaa8a051a971baef320055fcc0b9d4e15b3/PostHog/jeeves)

PostHog has released Jeeves, a 9B-parameter model for answering yes-or-no, multiple-choice, and rating questions through a Jev-compatible API. Its repository includes model weights, training code, and train, development, and test data for running the model locally on a CUDA GPU.

PostHog says allowing the model to reason before deciding raised its score on the company's test set to 0.889, versus 0.822 for Kev-9B and 0.857 for Jev. That reasoning has a latency cost: the repository reports a 3.3-second median per request with it, compared with about 0.3 seconds without it on one H100 GPU. The company also says Jeeves trails Jev on knowledge tests.

## Sources

- [GitHub](https://github.com/PostHog/jeeves)

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Canonical: https://techandbusiness.org/newswire/jy6_Dul9YDiWYzH4_fB8IK
Published: 2026-09-29T12:08:12.095Z
Story chronology: 2026-09-29T11:13:54.000Z
Retrieved: 2026-09-29T13:38:54.010Z
Publisher: Tech & Business (techandbusiness.org)