# PLaMo 3.1 Prime

PFN has released PLaMo 3.1 Prime, a domestically developed foundation model that folds reasoning and non-reasoning modes into one model and adds web search plus a Deep Research feature. PLaMo 3.0 Prime trained and served the two modes separately; under the configuration reported at the time, offering both took twice the compute of serving one single-mode model (PLaMo 2.2 Prime or PLaMo 3.0 Prime Beta). The new model is instruction-tuned in two stages, the second mixing in examples with the reasoning traces removed so one model switches per request. Against PLaMo 3.0 Prime it averages 2.4 points higher on reasoning-mode web-search QA and 11.1 points higher on search reports.

PFN has released PLaMo 3.1 Prime, a domestically developed foundation model that folds reasoning and non-reasoning modes into one model and adds web search plus a Deep Research feature. PLaMo 3.0 Prime trained and served the two modes separately; under the configuration reported at the time, offering both took twice the compute of serving one single-mode model (PLaMo 2.2 Prime or PLaMo 3.0 Prime Beta). The new model is instruction-tuned in two stages, the second mixing in examples with the reasoning traces removed so one model switches per request. Against PLaMo 3.0 Prime it averages 2.4 points higher on reasoning-mode web-search QA and 11.1 points higher on search reports.