Apertus 1.5 is a continued pretraining of Apertus 1.0, adding 4 trillion tokens to the 8B model and 2 trillion to the 70B model, for totals of 19T and 17T respectively. The release adds native image and audio understanding via early fusion, a thinking mode for reasoning, a 262,144-token context window, and improved instruction following and tool use. Weights, data, and training details remain fully open.
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