Apertus-v1.5 Multilingual and Multimodal Open Models
July 24, 2026
Apertus-v1.5 releases 8B and 70B parameter decoder-only models trained on up to 4T tokens using fully open datasets. The models support a 262,144 token context window and improved instruction-following through an enhanced post-training recipe.
HOW THIS AFFECTS YOU
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builderYou can deploy high-performing, fully transparent models with long context support.
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founderYou can build products on a verifiable, open-data stack to mitigate transparency and compliance risks.