EU AI Act statement

Version 1.0 · Last updated: 30 September 2026

This page explains how System1 Models relates to the EU Artificial Intelligence Act (Regulation (EU) 2024/1689, as amended by Regulation (EU) 2026/1744) and what that means for you as a customer. It is our own assessment of our role and duties. It is not a certificate: no conformity assessment or official certification exists for a service like ours, and we do not claim one.

1. What the Service does

The System1 Models API takes a situation and a set of answer options that you supply, and returns a probability for each option. It does not chat with people, and it does not generate free text, images, audio or video. You decide how its output is used in your own product.

2. The models and our role

• The models are open-weight models by outside developers, hosted unchanged. s1-fast runs Plumb-4B (Qwen3.5-4B lineage, Alibaba Cloud) and s1-pro runs Winnow-12B (Gemma 4 12B lineage, Google), both under the Apache License 2.0. We do not train, fine-tune, merge or otherwise change their weights, and we never use your data for training. Authors, revisions and licences are listed on Model licences.
• We are not the provider of a general-purpose AI model. The obligations for general-purpose AI models (Articles 53 and 54, in force since 2 August 2025) rest with the developers who trained and released these models. Under the European Commission's guidelines on general-purpose AI models (July 2025), a downstream party becomes a model provider only if it modifies a model with substantial training compute. We make no modification at all. Documentation and training-data information for the underlying models come from their developers' model cards; links are on Model licences.
• We provide the System1 Models API service. We are responsible for the service we operate: its intended purpose, its limits, the information on this page, and how we handle misuse.
• You are the deployer, or the provider of your own AI system. When you build the API into your product, you decide the purpose and the context. Your duties follow from that use (section 4).

3. Obligations that apply now, and what we do

AI Act rule	Applies since	What we do
Prohibited AI practices (Art. 5)	2 February 2025	Our Acceptable Use Policy forbids every prohibited practice. It binds you and your end users. We suspend keys when we find misuse.
AI literacy (Art. 4)	2 February 2025	The people who operate the Service work with these models daily. This page and our documentation state what the models can and cannot do, to support your team's AI literacy.
Transparency for certain AI systems (Art. 50)	2 August 2026	The API does not interact directly with natural persons and does not generate synthetic audio, image, video or text content, so the Art. 50 marking duties are not triggered by the API as delivered. If your product interacts with people or generates content, you must meet Art. 50 for your product (section 4).
High-risk AI systems (Art. 6 and Annex III)	2 December 2027 (Annex III, as amended)	The Service is not intended for any high-risk purpose. Our Acceptable Use Policy forbids decisions with legal or similarly significant effects on people based solely on the Service's output without meaningful human review.

4. What you must do

• Use the Service only within our Acceptable Use Policy and pass its rules on to your end users.
• If your product interacts with people, tell them they are dealing with an AI system where Art. 50(1) requires it. If your product generates or manipulates content, meet the marking and disclosure duties of Art. 50.
• If you use the Service within a high-risk AI system (for example in employment, education, credit or access to essential services), you are responsible for that system's requirements. Tell us before you do so. We will say honestly whether we can support that use.
• Test the models for your use case and monitor their output. Probabilities can be wrong or poorly calibrated for your data, and performance differs by language and domain.
• Support the AI literacy of the people in your organisation who use the Service (Art. 4).

5. Intended purpose and known limits

• Intended purpose: fast, low-cost classification and choice among options you supply, as one component in software that you control.
• Not intended for: being the sole basis of decisions about individuals with legal or similarly significant effects; any practice prohibited by Art. 5; safety-critical control without independent safeguards.
• Known limits: the models can be confidently wrong, may reflect biases in their training data, and have not been evaluated for every language or domain. Our benchmarks show where they trail other models.

6. Changes and contact

We update this page when the law, the Commission's guidance or our models change. If we ever modify model weights ourselves, we will reassess our role first and update this page. Questions and reports of misuse go to info@productivity-boost.com.