# Apertus: what I've logged

> Apertus comes up in 2 posts of my AI log, from September 2025 to July 2026, and each item below links to the primary source. The sources come from Swiss AI Initiative and Swiss AI (EPFL, ETH Zurich, CSCS), filed under frontier, open weights and image, video, world.

## Items

1. **Apertus 1.5 70B** (Swiss AI Initiative, 20 Jul 2026): A fully open 70B model from ETH Zurich and EPFL where weights, training data and recipes are all public under Apache 2.0. [Primary source](https://huggingface.co/swiss-ai/Apertus-v1.5-70B) · [Post](https://heyaliasif.com/ai/2026-07-20-week-in-ai#item-4)
2. **Apertus 70B** (Swiss AI (EPFL, ETH Zurich, CSCS), 1 Sept 2025): A fully open 8B and 70B family from Swiss public institutions, with the training recipe published. [Primary source](https://huggingface.co/swiss-ai/Apertus-70B-2509) · [Post](https://heyaliasif.com/ai/2025-09-01-week-in-ai#item-2)

## Posts

- 2026-07-20 [Claude Opus 5 arrives, Gemini 3.6 Flash and Solar Open 2 follow](https://heyaliasif.com/ai/2026-07-20-week-in-ai)
- 2025-09-01 [Kimi K2 stretches to 256K, Switzerland opens Apertus](https://heyaliasif.com/ai/2025-09-01-week-in-ai)

Canonical: https://heyaliasif.com/ai/topics/apertus