System1 Models
Hosted open decision models behind a Jev-compatible API, with an EU-only tier and a lower-cost global tier
System1 Models hosts open decision models behind a Jev-compatible API: send a state and typed questions, get back a probability for every allowed answer. Models are s1-fast (Plumb-4B), s1-pro (Winnow-12B) and s1-vision (Gemma 4 12B, text plus one image), plus a routing classifier.
The EU tier runs only on contracted EU operators in Finland, with a DPA at signup and no storage of prompts or answers. The cheaper Global tier can use GPUs rented through Lium outside the EU, for keys that opt in. Launch prices start at $0.025 per 1M input tokens; output tokens are free.
Pricing: Per token usage
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