PLaMo 3.1 Prime

Name: PLaMo 3.1 Prime
Author: Preferred Networks

Preferred Networks

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Version History

3.1 PrimeminorOctober 27, 2026

PLaMo 3.1 Prime succeeds PLaMo 3.0 Prime with web search, on-premises Deep Research and, per PFN, about 15% better average scores on eight hallucination benchmarks. PFN also claims 1.7 times the processing speed of 3.0 Prime.

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model release

PFN releases PLaMo 3.1 Prime with on-premises Deep Research and a free API plan; Standard tier is 60 yen per 1M input to

Preferred Networks (PFN) began offering PLaMo 3.1 Prime on October 27, a flagship model it develops from scratch in Japan. It adds web search and Deep Research that can run on-premises, and PFN also opened a free tier of the PLaMo API.

October 28, 2026 · 1:21 AM2 min read

PLaMo Preferred Networks PFN