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Opper AI raises £2.2m pre-seed from Luminar Ventures, Emblem and Greens Ventures to launch task completion API for AI developers

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Opper AI
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Göran Sandahl; Johan Gustafsson
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£2.2m
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London, United Kingdom
Jul 14, 2025

The team behind Unomaly, the machine learning-based observability platform acquired by LogicMonitor in 2020, has re-emerged with a new mission: to make AI infrastructure as reliable as Stripe is for payments.

Today, Opper AI announced the launch of its Task Completion API, backed by an oversubscribed £2.2m pre-seed round. The API is designed to help developers move beyond one-off prompts and fragile prototypes, providing a structured and dependable path to launching AI-powered features in production environments.

The funding round includes backing from Luminar Ventures, Emblem Venture Capital (backers of one of the fastest growing AI startups in Europe - Loveable), Greens Capital, and several prominent angel investors. The Opper founding team - Göran Sandahl, Johan Gustafsson, and engineers from the Unomaly core team - bring more than 50 combined years of experience building automated, production-grade systems.

The Opper API introduces a new abstraction: task contracts. Instead of writing and tweaking prompts manually, developers define tasks in JSON; specifying inputs, expected outputs, and success criteria. The Opper API takes over from there, using smart prompt generation, built-in feedback loops, and model interoperability to deliver accurate and repeatable results.

The success of chatbots, agents, or data tasks comes down to how reliably they interact with models. Opper removes the guesswork from prompt engineering and gives developers a tool that just gets the job done.
Göran Sandahl, Co-founder & CEO
We traded a patchwork of home-grown prompts and frameworks for Opper. It clearly works - and we’re now rolling out our pipelines across 62 countries including the US and India.
Adam, AI Engineer at GetTested
We’re seeing again and again that our customers can go confidently from beta to reliable production deployments.
Johan Gustafsson, Co-founder & CRO
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