Perplexity launches a Decisions API and open-sources pplx-decider-v1-27b, a decision model it says edges Jev (85.71% vs 84.51%)
On Oct 1, 2026, hours after Cloudflare's Clef, Perplexity released the Decisions API and the Apache-2.0 weights of pplx-decider-v1-27b, a multimodal model that returns a probability distribution over a fixed set of answers instead of text. It costs $0.04 per 1M input tokens with free output, and on Perplexity's 11-benchmark panel it scores 85.71% overall versus 84.51% for TypeSafe's Jev. It is the third Jev-style decision model in two days.
Key facts
- Model: pplx-decider-v1-27b, fine-tuned from Qwen3.8-27B; text and image input; Apache 2.0 weights on Hugging Face
- API: POST https://api.perplexity.ai/v1/decisions; $0.04 per 1M input tokens, output tokens free; up to 262,144 input tokens and 1–128 questions per request
- Perplexity's panel (11 benchmarks): overall 85.71% vs Jev 84.51% and base Qwen3.8-27B 74.76%; biggest gain on RAGTruth (88.80% vs 77.27%); Jev still leads on WinoGrande (90.70% vs 83.30%), BBH (94.27% vs 82.80%), JudgeBench, JevBench public hard and others
- Launch post by @perplexitydevs ~242k views on X
What happened
Perplexity followed TypeSafe's Jev (Sept 15), OpenAI's announced Decisions API and Cloudflare's Clef with its own decision model: a single forward pass scores every allowed option for typed questions (choice, score), so outputs are calibrated probabilities rather than generated text. The weights are open.
Why it matters
Within three weeks of Jev's launch, at least four large companies shipped compatible or competing "System One" decision models, two of them open-weight, which turns a single startup's product into a model category. All benchmark numbers are Perplexity's own.
Changelog
- 2026-10-03: created (morning web run, AI Weekly)
Models
- pplx-decider-v1-27b Perplexity · current
Related posts (1)
- Perplexity introduces the Decisions API and pplx-decider-v1-27b original ↗ Perplexity Developers @perplexitydevs · x · 2026-10-01
First-hand launch post (~242k views) of the third Jev-style decision model in two days.
Related events
- TypeSafe AI releases Jev, a 'System One' decision model that returns typed probabilities instead of text ★★★
- Cloudflare releases Clef and Clef-flash, open-weight multimodal decision models that are Jev-API compatible ★★★
Sources (4)
- docsPerplexity docs: Decisions API quickstart
- codeHugging Face: perplexity-ai/pplx-decider-v1-27b
- officialPerplexity Developers on X: Introducing the Decisions API
- pressAI Weekly: Perplexity open-sources 27B decider, edges Jev on 11-test panel
id: 2026-10-01-perplexity-decisions-api-pplx-decider · updated 2026-10-03 · open in the interactive timeline