# Best open-weights decision model — October 2026

As of Oct 15, 2026, vLLM-SR d3 (27B) & linne-oak 1.0 (31B) & Perplexity Decider v1.1 27B (Qwen3.8-27B, noncausal decision readout) are tied for state of the art with low confidence in Decision models, open weights (since Oct 14, 2026; sources Decision Index Full and JevBench; methodology v1.0).

Category board: https://isitsota.com/c/decision?slice=open-weights

## Top 10

- #1 vLLM-SR d3 (27B)
- #1 linne-oak 1.0 (31B)
- #1 Perplexity Decider v1.1 27B (Qwen3.8-27B, noncausal decision readout)
- #2 Decider 31B (NVFP4)
- #3 Sieve 31B
- #4 decisio v0.8.0 on gemma-4-31B-it (frozen, FP8 on load, one prefill per state, self-hosted)
- #5 Bobcat 1.3 (31B)
- #6 torchcast-decision-27b (Torchcast AI, Qwen3.8-27B fine-tune)
- #7 Darwin-27B-ZTC
- #8 René-1 31B FP8 (salfatigroup, Gemma 4 31B full fine-tune, one-pass option readout)

## Crown changes

- Oct 14, 2026 — Decision models: vLLM-SR d3 (27B) and linne-oak 1.0 (31B) and Perplexity Decider v1.1 27B (Qwen3.8-27B, noncausal decision readout) are co-SOTA
- Oct 8, 2026 — Decision models: Perplexity Decider v1.1 27B (Qwen3.8-27B, noncausal decision readout) takes the crown

## Weights

- Decision Index Full: primary, weight 1
- JevBench: primary, weight 1
- Decision Index latency: display, weight 0
- JevBench price: display, weight 0
- Vendor decision claims: display, weight 0