Apertus-8B-Instruct-2509 is an 8 billion parameter instruction-tuned large language model developed by Swiss AI. It features a custom chat template and supports advanced capabilities such as tool calling. The model is released as open weights on Hugging Face for developers to use in local or cloud inference setups.
Apertus 8B Instruct 2509 is a Foundation models & chat product. It focuses on running a capable open-weight 8B instruction-tuned LLM for chat and agent applications. It is built as an open-source project for developers. Apertus 8B Instruct 2509 is open source under the Open Source license. It runs on the web, the command line, and API.
Behind Apertus 8B Instruct 2509 is Swiss AI, based in Switzerland, and the product first shipped in 2025. Key capabilities include instruction tuning, chat template, and tool calling support. It exposes integrations via a public API.
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