The Swiss open model Apertus 1.5 gets its write-up: vision, audio and a 262,000-token context
Prepared by Sintelligent with the help of SI. Published in SI: . Updated: .
A fully open European model can see and hear, but this is a write-up of weights already released in the summer.
The Apertus team published release notes and a technical report for Apertus 1.5: the 8- and 70-billion-parameter models (weights under the Apache 2.0 license were posted to Hugging Face on July 24, 2026) continued pretraining on 4 and 2 trillion additional tokens, accept images and audio (they generate text only; audio handling is experimental), gained a reasoning mode, a context of 262,144 tokens — four times that of Apertus 1.0 — and improved tool use. As before, the weights, data and training details are open.
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