Apertus 1.5 Release Notes Detail Multimodal Understanding, Thinking Mode, and Longer Context
Apertus 1.5 Release Notes
- Who
- Hugging Face
- What
- released the updated Apertus 1.5 8B and 70B model weights
- When
- Quote
The updated 8B and 70B model weights were released to Hugging Face on July 24, 2026 under an Apache 2.0 license.
What happened
Project Apertus released Apertus 1.5 in 8B and 70B sizes, adding image and audio understanding, optional thinking, a 262,144-token context window, and improved instruction-following and tool use. The weights were released on Hugging Face on July 24, 2026 under Apache 2.0; the models generate only text, and spoken-language processing remains experimental. The team also publishes training data, recipes, intermediate checkpoints, and reproducible evaluation records.
Why it matters
Published intermediate checkpoints, training mixtures, and evaluation settings provide a concrete basis for investigating how individual training stages change model behavior and for reproducing reported results.
The story so far
Project Apertus released Apertus 1.5 in 8B and 70B sizes, making the model weights available on Hugging Face under Apache 2.0 and adding image and audio understanding, optional thinking, and a 262,144-token context window. Both models generate only text, and spoken-language processing remains experimental. The team reports improved instruction-following and tool use. It also publishes training data, training recipes, intermediate checkpoints, and reproducible evaluation records.
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