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Partners & Ecosystem

Nvidia
Mozilla
AI Alliance
Wikimedia Foundation
thws
Scaleway
Nvidia
Mozilla
AI Alliance
Wikimedia Foundation
thws
Scaleway
Nvidia
Mozilla
AI Alliance
Wikimedia Foundation
thws
Scaleway

Our Products

Synth

Synthetic Data for AI agents

We simulate expert-level reasoning and domain-specific processes to generate training data that builds true specialization into your models. Synth handles the cold start problem, covers the long tail of edge cases through engineered simulations, and runs entirely on-premise to keep sensitive data under your control.

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Common Corpus

Fully Open Data for AI

We curate and structure the world's largest rights-cleared and provenance-based dataset for LLMs - government records, legal archives, scientific literature, multilingual sources - so you can plug it directly into your models, RAG pipelines, and MCP servers.

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Stratum

AI-Native Tooling for Agents

Turn your messy siloed documents into a single, structured, compliant data asset for your agentic AI workflows. Your AI systems and agents get not only the right information but rich trustworthy context - higher accuracy on a wider range of processes. A built-in privacy firewall handles PII before anything leaves the secure zone. Deployable fully on-premise.

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Recent Blogs

An RLM agent for searching Wikidata, and the traces to train on itBlog

An RLM agent for searching Wikidata, and the traces to train on it

In partnership with AI-BRIDGES at the Digital Humanities Research Hub, University of London, we are releasing an open recursive harness in which language models search Wikidata through code, instead of pasting graph results into their context. In it, Qwen3.8-27B, an open-weight model served on a single GPU, answers 74 of 100 test questions, the best score in our evaluation, and gpt-6-luna doubles its accuracy on multi-hop questions. Alongside it, we release the 10,235 search traces recorded in the harness, for training smaller models to do the same.

Carlos RosasMohamed ChenenePierre-Carl LanglaisAnastasia Stasenko
Carlos Rosas, Mohamed Chenene, Pierre-Carl Langlais & Anastasia Stasenko
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Local AI for knowledge work: what small open models can do offlineBlog

Local AI for knowledge work: what small open models can do offline

On the occasion of the AI for Good Global Summit in Geneva, we are open-sourcing the models, datasets, and deployment frameworks presented in this post: the reasoning models framework for RAG, our on-device benchmarking harness for cache-augmented generation, and the French-language retrieval pipeline for Raspberry Pi and Android. Everything described here runs fully offline, on hardware costing less than €100.

Carlos RosasIaroslav Neverov
Carlos Rosas & Iaroslav Neverov
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Telco Common Corpus: an open, verified data commons for telecom AIBlog

Telco Common Corpus: an open, verified data commons for telecom AI

Today we introduce the Telco Common Corpus - 10B+ tokens of fully open telecommunications data, highlighting, as part of the GSMA Open Telco AI initiative, how the company is helping AI work harder for the telecoms sector.

Pleias
Pleias
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Use Cases

Sillon: A Specialised 600M Model for Parisian Subway Operator (RATP) Use Case

Sillon: A Specialised 600M Model for Parisian Subway Operator (RATP)

Pleias trained a 600-million-parameter specialized model for RATP to detect and interpret safety signals in Parisian Subway users’ messages - combining a fully synthetic training pipeline and designed for on-premise deployment. After only three months of development, the model, beating closed models 200x times its size, is now in production at RATP’s sovereign infrastructure on Scaleway.

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Building Offline-First AI for Community Health Workers in West AfricaUse Case

Building Offline-First AI for Community Health Workers in West Africa

Researchers built an AI medical assistant that works without internet for health workers in rural West Africa. It runs on old Android phones and handles local languages to give workers quick treatment guidance.

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SpineDAO & Pleias Partnership In Specialised AI For Spine CareUse Case

SpineDAO & Pleias Partnership In Specialised AI For Spine Care

Pleias and SpineDAO are partnering to build AI systems that safely scale expert spine care for back pain, the world's leading cause of disability. The project tests whether small, structured-reasoning models can outperform large generic LLMs in high-stakes clinical settings.

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Research Highlights

It's All Training: A Fully Synthetic Single-Stage Recipe for LLMsTraining Data

It's All Training: A Fully Synthetic Single-Stage Recipe for LLMs

Current pre-training datasets are derived from web crawls, with all their issues, and were not designed to support mid- and post-training pipelines--for instance, they contain little explicit reasoning. Thus, many frontier labs have begun to develop their own internal datasets, starting from state-of-the-art models, to augment their pre-training data mix, eg, with reasoning traces to address cold-start problems. While demonstratively effective, none of these datasets are public, and the effect of this so-called synthetic data on knowledge and skill acquisition of language models, including small ones, remains poorly understood. We present SYNTH, the first open-source synthetic corpus derived from 58,698 Wikipedia articles that collapses pre-, mid-, and post-training into a single training stage via structured amplification of curated encyclopedic seeds. We evaluate SYNTH by training a suite of models: a 56M tiny model (Monad), 0.3B-0.6B dense models (Baguettotron), and a 13B / 1B-active MoE. At iso-compute, SYNTH outperforms filtered web data, and our models remain competitive with similarly-sized open-weight baselines. Because SYNTH is back-translated from grounded passages, SYNTH-trained models achieve high factual precision despite 10-140x fewer training tokens, with memorization targeted by the seed corpus. These results show that synthetic datasets, including our SYNTH dataset, are capable of producing competitive generalist models from a fraction of the training data, enabling rapid iteration as the frontier advances. These findings open up possibilities for both generalist models with significantly increased data efficiency, as well as domain-specific models where no instruction or conversational data is available. Finally, we publicly release our SYNTH dataset and the suite of Baguettotron models under a permissive license, thus supporting open-source language model development.

Training Data
Models
open source
Common Corpus: The Largest Collection of Ethical Data for LLM Pre-TrainingICLR Oral

Common Corpus: The Largest Collection of Ethical Data for LLM Pre-Training

Large Language Models (LLMs) are pre-trained on large amounts of data from different sources and domains. Such datasets often contain trillions of tokens, including large portions of copyrighted or proprietary content, which raises questions about the legal use of such models. This underscores the need for truly open pre-training data that complies with data security regulations. In this paper, we introduce Common Corpus, the largest open dataset for LLM pre-training.

ICLR Oral
Training Data
Open Source
Bye Bye Perspective API: Lessons for Measurement Infrastructure in NLP, CSS and LLM EvaluationEvaluation

Bye Bye Perspective API: Lessons for Measurement Infrastructure in NLP, CSS and LLM Evaluation

The closure of Perspective API at the end of 2026 discards what has functioned as the de facto standard for automated toxicity measurement in NLP, CSS, and LLM evaluation research. We document the structural dependence that the communities built on this single proprietary tool and discuss how this dependence caused epistemic problems that have affected - and will likely continue to affect - collective research efforts.

Evaluation
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