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System One

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Under Labs

@under-labs

Brazilian company (Under Serviços de Internet Ltda.) building language models for Brazilian Portuguese and Brazil's legal, tax and fiscal contexts.

underlabs.ai Joined October 2026

1model

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System One lists Under Labs’s public models here, with their original licences, until someone from Under Labs runs this page. It is not Under Labs’s own account.

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Models 1 Builds 0

decisorUnder Labs

Technical-preview fine-tune of Qwen3.5-4B for typed decisions in English and Brazilian Portuguese, with extra training on Brazilian legal and tax text. Picks one supplied option from one prefill pass and returns option probabilities, which are not calibrated.

73.6%4.0Bapache-2.0

choice · classify 0 03 hours ago