Terms of Service — Version 1.5.3 (archived)

Since 9 October 2026, the service formerly presented as System1 Models has been presented under the Decision Models brand at decisionmodels.io. The provider remains productivity-boost.com Betriebs UG (haftungsbeschränkt) & Co. KG. References to System1 Models and system1models.ai in this document identify the same service. This branding update does not change the provider or the terms of this document.

Version 1.5.3 · Last updated: 7 November 2026

These Terms of Service ("Terms") govern the use of the System1 Models API, dashboard, MCP server and related services ("Service") at system1models.ai. The Service is provided by productivity-boost.com Betriebs UG (haftungsbeschränkt) & Co. KG, Reichenberger Str. 2, 94036 Passau, Germany, Amtsgericht Passau HRA 12725 ("we", "us"). A German version is available; if the two versions differ, the German version prevails.

1. Customers worldwide

1.1 Private individuals, businesses, legal entities under public law and special funds under public law worldwide may sign up and top up ("Customer"). Mandatory legal restrictions remain applicable.

1.2 By creating an account, you confirm that you may enter into this contract and, if you act for an organisation, that you are authorised to bind it. You must provide accurate account and billing information. We may ask for information needed to verify it.

1.3 Conflicting or supplementary general terms of business customers do not apply, even if we do not expressly object to them. Mandatory consumer rights, including any statutory withdrawal rights, remain unaffected by these Terms. See the withdrawal notice and model withdrawal form.

2. Contract

2.1 The contract is concluded when you create an account and accept these Terms. Each top-up is a separate order that we accept by crediting the amount to your balance.

2.2 We store the text of these Terms. The current version is always available at /legal/terms; all versions are archived at /legal/terms/archive.

3. The Service

3.1 The Service provides typed-decision inference: you send a state (text and, where supported, images) and one or more questions (for example yes/no, multiple choice or score). A model returns a probability for each answer option. The Service does not generate free text.

3.2 The Service accepts requests whose state and questions follow the Jev typed-decision structure. The provider, model IDs, tier selection, authentication, billing, limits and metadata are System1 Models extensions; until an integration test against TypeSafe's documented schema passes, we do not claim byte-for-byte compatibility. Jev is a trademark of TypeSafe AI. System1 Models is not affiliated with TypeSafe AI, and we do not offer TypeSafe's Jev model. We host open-weight models from third-party authors, listed with their licences at /models and /legal/model-licences.

3.3 Tiers. The Customer chooses a tier per API key or per request:

• EU tier: processing only in the European Union on the infrastructure and sub-processors listed at /legal/subprocessors, with priority access to our EU capacity. See the Data Retention statement for the scope and limits of content-retention controls.
• Peer-to-Peer tier: The Peer-to-Peer tier first uses spare EU capacity, with lower priority than EU-tier requests. When that capacity is busy, Peer-to-Peer requests may use on-demand GPU capacity rented through Lium (lium.io). Independent third-party providers operate the GPU hardware in various countries, including outside the EU/EEA. Processing outside the EU happens only for API keys whose customer has explicitly enabled the "Allow worldwide processing" switch, and for keys with network processing under the Peer-to-Peer Network Processing Addendum. Without that opt-in, Peer-to-Peer requests stay on EU capacity and may be queued or rejected with a retryable error when busy. EU-tier requests always stay in the EU and have priority. Existing customers keep EU-only processing unless they opt in for the individual key. Before adding or replacing a content sub-processor, we notify affected customers within the notice period set in section 6.2 of the Data Processing Agreement and update the sub-processor list, DPA and Privacy Policy. For new Peer-to-Peer keys, network processing by independent providers is preselected under the Peer-to-Peer Network Processing Addendum; the customer can choose "Our GPUs only" before creating the key and can switch network processing off at any time. Do not send personal data on keys with network processing enabled; use the EU tier for such content. The sub-processor list explains the transfer conditions.

Our API gateway is configured not to include request or response bodies in application logs. Our usage database stores usage and billing metadata and a keyed request digest for idempotency, rather than request or response bodies. These statements concern the API gateway and usage database. They do not guarantee that content never reaches disk elsewhere in the processing path: operating-system swap and crash-dump mechanisms on the gateway and TLS-edge host have not been excluded. They do not cover the rented Peer-to-Peer router or independent network providers. When network processing is enabled for a key, independent providers receive the request content in clear text and may retain it; we cannot prevent or control that retention. Do not send personal data, secrets, or confidential material using a network-enabled key. See the Peer-to-Peer Network Processing Addendum.

The Data Processing Agreement applies to both tiers.

3.4 We may change, add or retire models, features and the API with reasonable notice. We give at least 30 days' notice before retiring a model or making a backward-incompatible API change, except where a change is required for legal or security reasons.

3.5 Subject to the validity stated with an invite code and the original terms of existing allowances (section 5.3), free test credits, beta features and models marked "preview" are provided without any availability commitment and may be changed or ended at any time.

3.6 Model classes. s1-fast, s1-pro and s1-vision are service tiers: each identifier stands for a class of models, not for one fixed model or model version. The models currently used are listed at /models and /legal/model-licences. To improve quality, speed or efficiency, we may replace the model behind an identifier at any time, provided that (a) the replacement is at least equal in measured quality for the typed-decision tasks of that identifier, based on our internal and published decision-quality evaluations; (b) the API contract (endpoints, request and response format, question types) stays unchanged; (c) the prices for that identifier stay unchanged, unless they are changed under section 5.6; (d) the Data Processing Agreement and the processing location of the tier you chose (section 3.3) stay unchanged, and a new sub-processor is added only under the notice procedure in section 3.3; and (e) the replacement is an open-weight model hosted by us as described in section 3.2. Individual results may differ after a replacement; we do not guarantee identical outputs for identical inputs. By the time a replacement goes live, we state it with its date at /models and /legal/model-licences. Section 3.4 (30 days' notice) applies when we retire an identifier without a replacement or make a backward-incompatible API change, but not to a replacement that meets (a) to (e). If you need a fixed model version, contact info@productivity-boost.com; a pinned or dedicated offering is agreed separately in text form. You may terminate at any time under section 13.1 and have unused purchased credit refunded under section 5.5.

4. Accounts and API keys

4.1 You must give accurate account information and keep it up to date.

4.2 You are responsible for keeping your API keys confidential and for all use made with your keys until you revoke them in the dashboard. Tell us without undue delay at info@productivity-boost.com if you suspect misuse.

4.3 You may give your employees and contractors access, and you may integrate the Service into your own products for your end users. You remain responsible for their use as for your own and must pass on the relevant obligations of these Terms and the Acceptable Use Policy.

5. Prices, prepaid credits and payment

5.1 Outside free allowances and promotional credit under section 5.3, the Service is paid in advance with prepaid credit. Private individuals and businesses worldwide may sign up and top up. Prices are listed at /pricing, per million input tokens and per model and tier, excluding applicable taxes. German VAT applies to customers in Germany. EU business customers in other member states with a valid VAT ID use reverse charge. EU consumers pay German VAT or, once applicable, the VAT of their country. Customers outside the EU pay no German VAT; local VAT, GST or sales tax may apply where we are registered or required to be registered. Taxes are shown in checkout before you pay.

5.2 The minimum top-up is EUR 1, excluding applicable taxes. Payments are processed by Stripe. Input tokens not covered by a free allowance or promotional credit are charged against your balance at the price that applies when the request is processed. Output tokens are free. Usage is measured by our systems; your dashboard shows it per request with model, tier, tokens and cost, and shows your current balance.

5.3 Free allowances and promotional credit.

(a) Invite codes. Free allowances are offered through an invite code; the type, amount and validity are stated with the code and shown when it is redeemed.

(b) Starter credit. A new account whose sign-up starts from the "Use" button on a model page or from one of our ads, whose account currency is EUR and whose email address is verified receives a one-time promotional credit of EUR 5 ("starter credit"), as long as this calendar month's allocation of 100 starter credits lasts. Once it is used up, eligible new accounts receive EUR 0.50 instead while a second allocation of 100 lasts; after that, no starter credit is granted that month. The starter credit is granted once per person and email address. It is not granted to accounts that have already received a free allowance, invite credit or promotional credit, to addresses from disposable email services, or to our own or test accounts.

(c) Rules for promotional credit. Promotional credit can be used only for API requests and is used before your purchased balance. It expires 30 days after it is granted; the expiry date is shown in your dashboard. It has no cash value and cannot be transferred, paid out or refunded. We may change or end an offer for the future at any time; credit already granted keeps its terms.

(d) Existing allowances and balances keep their original terms, including any existing allowance without an expiry. Free allowances cannot be transferred or refunded. For input-token allowances, before each request the Service reserves up to 4,096 input tokens from the remaining allowance. If fewer than 4,096 remain, you need sufficient prepaid credit for the possible uncovered part of that request; without it, the request is rejected even if a small part of the free allowance remains. We charge only actual input tokens not covered by the allowance. Once it is exhausted, requests use your prepaid balance automatically at the listed price. The separate EUR 2 (or USD 2.28) promotional monetary credit offer is currently switched off and is not granted automatically.

(e) First-key credit. A new account created on or after 5 November 2026 at 16:00 UTC, whose account currency is EUR and whose email address is verified, receives a one-time promotional credit of EUR 0.50 when its first API key is created, up to a limit of 36 such credits in any 7 days. It is granted once per email address. It is not granted if this account or another account with the same email address (ignoring capitals, +tags and dots in Gmail addresses) has already received a free allowance, invite credit, promotional credit or the starter credit, to addresses from disposable email services, or to our own or test accounts. For this credit and the starter credit, an address counts as a test address if the part before the @ contains the whole word test, e2e, smoke, probe or canary, with or without a number after it, or if its domain is reserved for testing (such as example.com or a .test domain). The credit does not change your account's rate limits.

5.4 If your balance runs out, requests requiring paid credit are rejected until you top up. Your current balance is shown in the dashboard.

5.5 Purchased credit does not expire while your account is open. Used credit is not refunded. Unused purchased credit is refunded on request to the original payment method, minus any payment fees that cannot be recovered. When an account is closed, we refund unused purchased credit automatically.

5.6 Price changes. The Service is pay-as-you-go. There is no minimum term, no subscription and no minimum purchase beyond the minimum top-up in section 5.2.

(a) If we reduce a price, the reduction takes effect immediately for all customers.

(b) If we increase a price, the new price applies immediately to customers who create their account on or after the day we publish the new price at /pricing. For customers whose account was created before that day, the new price applies only to requests processed after seven (7) days have passed since we sent notice of the increase by email to the address of your account. The notice states the new price and the day from which it applies.

(c) A price change applies only to requests processed after it takes effect. Requests already processed keep the price that applied to them.

(d) After a price increase you may at any time, and in particular before it applies to you, ask us to refund your unused purchased credit under section 5.5, and you may terminate under section 13.1.

5.7 We issue an electronic invoice or receipt for each top-up.

6. Your content and responsibilities

6.1 "Customer Content" means the data you send to the Service (states, questions, images) and the results returned to you. You keep all rights to Customer Content. We receive only the rights needed to process it to provide the Service.

6.2 You are responsible for having the rights and legal basis to submit Customer Content, including any personal data. When you send personal data to the Service, you act as controller and we act as your processor under the Data Processing Agreement. You may submit personal data to the Service only after you have accepted the Data Processing Agreement in the dashboard; before that, submit no personal data.

6.3 You must comply with the Acceptable Use Policy, which forms part of these Terms and includes the use restrictions of the model authors.

6.4 Results are probabilities, not facts. Models can be wrong, biased or poorly calibrated for your use case. You are responsible for testing the results for your purpose, for keeping appropriate human oversight, and for any decision you make or automate with them, including your obligations under Art. 22 GDPR and the EU AI Act (Regulation (EU) 2024/1689). You must not use the Service as the sole basis for decisions with legal or similarly significant effects on individuals.

7. Availability and support

7.1 We provide the Service on a best-effort basis and publish availability and latency targets in our Service Level Targets. The targets describe our goals; they are not a guaranteed service level and do not give rise to service credits, unless we agree otherwise in writing.

7.2 Planned maintenance is announced in advance where possible, by email to the contact address of the affected accounts. Once live monitoring is connected, we will also report on the status page at system1models.ai/status.

7.3 Support is provided by email at info@productivity-boost.com on German business days.

8. Suspension

8.1 We may temporarily suspend access, fully or for individual API keys, if (a) there is a reasonable suspicion that the Service is being used in breach of these Terms or the Acceptable Use Policy, (b) use endangers the security or stability of the Service or other customers, or (c) we are required to by law or by an authority. We limit the suspension to what is necessary, inform you without undue delay, where legally permitted, and restore access once the reason no longer applies.

8.2 We may apply rate limits to protect the Service. Any rate limits in effect are stated in the API documentation.

9. Warranty

9.1 We provide the Service with the care of a prudent business. Because the Service consists of statistical models, we do not warrant that results are correct, complete or suitable for a particular purpose.

9.2 You must report defects in text form with a description that allows us to reproduce them. We will remedy defects within a reasonable time. For business customers, strict liability under § 536a(1) first alternative BGB for defects that existed when the contract was concluded is excluded.

10. Liability

10.1 We are liable without limitation for intent and gross negligence, for injury to life, body or health, under the German Product Liability Act, and to the extent we have given a guarantee.

10.2 In cases of slight negligence, we are liable only for breaches of an essential contractual obligation (an obligation whose fulfilment makes proper performance of the contract possible in the first place and on whose fulfilment the Customer may regularly rely). In that case our liability is limited to the damage that is typical and foreseeable for this type of contract. For business customers, per calendar year this liability is limited to the amounts the Customer paid for the Service in the twelve months before the event causing the damage, and to at least EUR 1,000.

10.3 Otherwise, our liability for slight negligence is excluded.

10.4 The limitations above also apply to the personal liability of our employees, representatives and agents.

10.5 Liability under the Data Processing Agreement and under Art. 82 GDPR is governed by the statutory rules, subject to this section 10 to the extent the law allows.

11. Indemnity

A business customer indemnifies us against third-party claims, including fines by authorities, arising from Customer Content or from the Customer's use of the Service in breach of these Terms, the Acceptable Use Policy or applicable law, provided the Customer is responsible for the breach. This includes reasonable costs of legal defence.

12. Confidentiality

Both parties keep confidential the non-public information they receive from the other party in connection with the contract and use it only for the contract. This does not apply to information that is public, was lawfully known before, is independently developed, or must be disclosed by law or by order of an authority. Customer Content is always treated as confidential.

13. Term and termination

13.1 The contract runs for an indefinite period. The Customer may terminate at any time by email to info@productivity-boost.com. We may terminate with 30 days' notice by email.

13.2 Both parties may terminate for good cause without notice. Good cause for us includes, in particular, serious or repeated breaches of the Acceptable Use Policy, or payment fraud.

13.3 On termination, we refund unused purchased credit (section 5.5), except where we terminate for good cause caused by the Customer and have a counterclaim; in that case we may set off our claims. We delete account data as described in the Privacy Policy, subject to statutory retention periods.

14. Changes to these Terms

14.1 We may change these Terms where this is necessary because of changes in law or case law, requirements of authorities, security needs, or technical changes to the Service, and where the change does not shift the balance between our and your obligations to your disadvantage. We will send the new version to you by email at least six weeks before it takes effect. If you do not object in text form before the effective date, the new Terms apply. We will point out this consequence and your right to object in the notice. If you object, either party may terminate the contract with effect from the date the change takes effect, and we refund unused purchased credit. This procedure applies only to business customers; changes to a consumer contract require express agreement.

14.2 Changes that materially reduce your rights, in particular regarding the scope of the Service, liability, refunds or data protection, require your explicit consent. Price changes are governed by section 5.6.

15. Final provisions

15.1 German law applies, excluding the UN Convention on Contracts for the International Sale of Goods (CISG). For consumers, mandatory protections under the law of their country of habitual residence remain unaffected.

15.2 If the Customer is a merchant (Kaufmann), a legal entity under public law or a special fund under public law, or is a business customer with no general place of jurisdiction in Germany, the exclusive place of jurisdiction for actions brought by the Customer against us arising from or in connection with this contract is Passau, Germany; we may also bring actions at the Customer's general place of jurisdiction. Consumers retain their statutory places of jurisdiction.

15.3 The Customer may assign rights under this contract only with our consent. § 354a HGB remains unaffected.

15.4 If a provision of these Terms is or becomes invalid, the rest of the Terms remain valid. The statutory provisions apply in place of the invalid provision.

15.5 Documents that form part of the contract, in this order of precedence: (1) any individual written agreement, (2) the Data Processing Agreement for the processing of personal data, (3) these Terms, (4) the Acceptable Use Policy, (5) the price list at /pricing.