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Apertus 1.5 Launches 8B & 70B Models with Multimodal Capabilities and 262K‑Token Context Window

1 reports1 sources10/15/2026 updated

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Project Apertus has released version 1.5, introducing two new models—an 8‑billion‑parameter and a 70‑billion‑parameter variant—alongside multimodal understanding for images and audio. The update also adds a new “thinking” mode and expands the context window to 262,144 tokens. The model weights were made available on July 24 2026 under an Apache 2.0 license. This release marks a significant step forward in the project’s ability to process longer inputs and handle multiple data modalities, positioning Apertus as a more versatile foundation model for a range of AI applications.

Written with AI from the reporting · updated 10/15/2026

Latest developmentOct 15, 17:08
Apertus 1.5 releases 8B and 70B models with multimodal understanding and extended context
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  1. 1Unclassified fact stationJul 24, 00:00recorded Oct 15, 21:29single sourcerevised

    Apertus 1.5 Release Notes

    Read original source ↗ Hugging Face BlogReplay this moment in the explorer
    Evidence & revisions · 1 source records
    Subject：
    Project Apertus
    Action：
    发布 A1.5 版本
    Object：
    模型权重与技术报告
    Occurred (fact side)：
    Jul 24, 00:00
    Hugging Face Blog ↗Report pageRevision 2 · currently revised
    Published (valid side)：
    Oct 15, 17:08
    First seen (known side)：
    Oct 15, 21:29
    Fact stationSingle source · one-sided claimRevised

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Oct 15
  1. Hugging Face BlogFirst-party sourceRelated fact: single sourceSource report revised
    Apertus 1.5 releases 8B and 70B models with multimodal understanding and extended context

    Report first recorded Oct 15, 21:29

    Apertus 1.5 updates the 8B and 70B Apertus 1.0 models by incorporating image and audio understanding, an optional thinking mode, and a 4x longer context window of 262,144 tokens. The updated weights were released on July 24, 2026, under an Apache 2.0 license. The models were further pretrained using 4 trillion tokens of text and multimodal data for the 8B model, and 2 trillion tokens for the 70B model, totaling 19T and 17T respectively. The models are fully open, featuring open weights, open data, and full training details.

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