Hack Apertus

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https://hackapertus.ch/

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Build on Apertus 🇨🇭

Welcome to Hack Apertus, an open-source hackathon movement built around Apertus, the fully open large language model. Hack Apertus is a three-stage hackathon series with an Online Hackathon and six On-site Hackathons in Swiss cities, running from October 2026 until May 2027. Interdisciplinary teams build on Apertus to create reusable blueprints deployable air-gapped, on-premise, or on sovereign cloud infrastructure. You can join any hack, or all of them. Thanks for joining and contributing your time and expertise. 👋

What we build on: Apertus

Apertus is Switzerland's fully open LLM, developed by EPFL, ETH Zurich and CSCS within the Swiss AI Initiative (SNAI). It is open weights + open data + full training recipes, trained on 1,800+ languages (incl. Swiss German and Romansh), and developed with the EU AI Act in mind. First released 2 September 2025 under Apache 2.0; the 1.5 versions (8B/70B) followed on 24 July 2026.

Hack Apertus builds on the v1.5 family: continued pretraining of Apertus 1.0 that adds multimodal input, tool use, and up to 262k-token context.

🗓️ Hackathon Roadmap

Stage	Dates	Details
01. Online Hackathon	Oct 1–16, 2026	Open to everyone worldwide. Use case prototypes, model adoption, and academia challenges
02. On-site Hackathons	Oct 2026 – May 2027	2-day local hacks in Bern, Zurich, Basel, Biel/Bienne, Lausanne & St.Gallen
03. Grand Finals	May 14, 2027	Closing showcase and pitch competition of all Hack winners for the main «Hack Apertus» Award in St.Gallen