Paper Instruments Launches Ultramarine 1 Flash Open Model

Paper Instruments announced Ultramarine 1 Flash on October 14, calling it an open-source model for knowledge work. It said the API was available, with weights planned for release two weeks later. TestingCatalog describes it as a post-training of GLM-5.3 Flash for work including Excel models, slide decks and Word memos. It cites Paper Instruments' internal benchmark, which scored Ultramarine at 59.3 for $0.13 per task, versus Claude Fable 5 at 57.8 for $8.19.