Weflayr raises $2.5M to route AI requests to the cheapest capable model
What's the deal? WeflayrDealroom has a profile for this one. Try Dealroom →, a French startup founded by former Mangopay chief executive officer Romain Mazeries and Noé Achache, has raised $2.5 million in pre-seed funding. The round was led by 13books CapitalDealroom has a profile for this one. Try Dealroom →, with participation from Founders FutureDealroom has a profile for this one. Try Dealroom →, Kima Ventures, Plug and Play, Station F Ventures, and Roxanne VarzaDealroom has a profile for this one. Try Dealroom →. The company is building a layer that routes every AI request to the most appropriate model at the best price.
What's the endgame? Hundreds of AI models now compete on quality, speed, and cost, but many companies still lean on a handful for most workloads. Weflayr sits between enterprise applications and these models, learning from a client's own production data rather than generic benchmarks. Companies define routing strategies and approve only the models they trust.
Early results: Weflayr says its first deployment cut inference costs by more than 55% while keeping quality equivalent. In another test, it reached 15 percentage points higher relative quality at the same cost as a frontier model.
Why now? Mazeries draws a direct parallel to payments, where infrastructure evolved toward sophisticated routing over 15 years — a shift he says AI is now repeating far faster. The $2.5 million will fund engineering and AI research, faster product development, and go-to-market efforts in Europe and the US. Weflayr is incubated at Station F through its F/AI program and is already onboarding its first customers.
What could go wrong? The market is crowded and well-capitalised. OpenRouter, a US model-routing platform, was acquired by Stripe last summer in a deal the New York TimesDealroom has a profile for this one. Try Dealroom → valued at $7.5 billion.
The signal: Investors increasingly treat AI inference as an infrastructure layer in its own right. "There is a massive opportunity for an independent intelligence layer that gives AI companies control over quality, performance, and economics," said Mike McFadgen, partner at 13books Capital. As builders prioritise cost control, routing that measures models against real workloads — not benchmarks — is becoming a category of its own.
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