Perplexity Open-Sources pplx-decider-v1-27b Decision Model
On October 2, Perplexity CEO Arav Srinivas announced the open-source multimodal decision model pplx-decider-v1-27b, with weights uploaded to Hugging Face (perplexity-ai/pplx-decider-v1-27b) and served through the new Decisions API at $0.04 per million input tokens with free output tokens. Unlike conventional language models, it produces probability distributions over fixed answer sets instead of text, positioning itself as a decision component for software systems.
Confirmed
- The model is named pplx-decider-v1-27b, roughly 27B parameters. According to rm-rf-rm and inductionheads, it is fine-tuned from Qwen3 27B; jedisct1 relayed that it is based on Qwen3.8-27B with a 250k context window; inductionheads characterizes it as a "generative discriminator"
- It supports multimodal understanding: per victormustar and Maziyar Panahi's inspection of the Hugging Face model card and chat template, the model handles image and video inputs
- Per Perplexity researcher denisyarats, the Decisions API runs this model underneath, reading text, JSON, or images and returning structured answers with probabilities rather than generated text for direct software use
- Pricing is $0.04 per million input tokens, with output tokens free
- The announcement posts included no benchmark results or technical details
Why it matters
- A decision model compresses LLM capability into programmable probabilistic output, removing free-text parsing and fitting directly into software workflows
- The combination of open weights and a cheap API lowers the barrier for developers to try it in routing, classification, and selection tasks; victormustar sees it as another alternative in the emerging decision-model space (the Jev lineage)
2026-10-02 ~ 2026-10-02 · 8 related posts
- Episode 1: Perplexity Open-Sources pplx-decider-v1-27b Decision Model(2026-10-02, 8 posts)
- Episode 2: Perplexity Open-Sources pplx-decider-v1.1-27b, Tops HF Decision Index(2026-10-07, 8 posts)
Primary sources
- [source] Perplexity open-sources multimodal decision model at $0.04 per million input tokens — AravSrinivas · 2026-10-02
- [source] Perplexity quietly releases pplx-decider-v1-27b on Hugging Face — victormustar · 2026-10-02
- Perplexity open-sources pplx-decider-v1-27b, fine-tuned from Qwen 27B — jedisct1 · 2026-10-02
- [source] Perplexity launches Decisions API: probability-based answers at $0.04/M input tokens — denisyarats · 2026-10-02
- Perplexity open-sources pplx-decider-v1-27b, a fast generative discriminator at $0.04/1M tokens — inductionheads · 2026-10-02
3 near-duplicate retellings: MaziyarPanahi · hwchase17 · rm-rf-rm