Co-Founder at @CallosumAI & Fellow of @StJohnsOx @UniofOxford. Working on understanding intelligent systems in neuroscience & building them in computing and AI.

Joined January 2015
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We are at a unique moment in time for AI & compute: New accelerators / chips, HPC hardware, and new algorithms have each made strides, but we are not yet orchestrating them as a heterogeneous stack. That is what @CallosumAI is built to do, and today we are sharing our vision 🧵
Today we launched @CallosumAI. We are building the infrastructure where heterogeneous chips & intelligence co-evolve to solve the world's hardest problems. Today we present our first results. Across four large problem spaces, we break SOTA and deliver orders-of-magnitude improvements in capabilities, cost and speed: 12× cheaper deep context. New web SOTA with open-source, 3x cheaper and faster. 2.4× cache speedups. 1,767× faster tool calling. This is the worst our infrastructure will ever be. We do it by co-evolving heterogeneous chips and multi-agent intelligence - workflows aware of their hardware, models aware of their task graph, kernels aware of their output constraints. An Intelligent System. callosum.com/blog/welcome-he…
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Jascha Achterberg retweeted
Lots of good stuff in the UK's new AI Hardware Plan, announced by @leicesterliz today. Great to see it building on both the AI Opportunities Action Plan and @ARIA_research's work on the Scaling Inference Lab. Lots to do, but this is smart, focused and appropriately ambitious.
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Jascha Achterberg retweeted
At @CallosumAI we are aggressively scaling up hiring, in our London office 🇬🇧 We are building a more pluralistic vision of AI: co-evolving diverse chips and new architectures for the next generation of intelligence, that is economically viable at scale. We've opened roles across our inference engineering and heterogeneous infra teams. We want the most ambitious & exceptional people to join us. If you want to do the work of your life, would love to talk! 👇
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Jascha Achterberg retweeted
The UK Government has just announced a £1.1bn package for AI Hardware! LETS GO Here's what is in the package: > £750m for a national AI supercomputer that will run on a heterogeneous mixed chip system (which @DanAkarca and @CallosumAI are building the future for) > Of the £750m, £400m will go towards equipping the UK’s AI supercomputer with next-generation chips, which could include buying chips from UK companies OLIX and Fractile > £120m will fund a new AI Hardware Innovation Programme to give british companies the funding to design, develop and test innovative novel chips > £20m of the programme will expand the Scaling Inference Lab, delivered by ARIA and CommonAI > £45 million in new support for skills including backing doctoral training and undergraduate bursaries to train more engineers, chip designers and technicians I caught up with the Minister of AI @KanishkaNarayan to get all the details. LETS GO amazing news 👏
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Jascha Achterberg retweeted
1/ I'm really excited to share that Plural is leading @Orbital_Ind's $50m Series B round Orbital is using AI to discover and design novel compounds from the atoms up, then engineering the products that exploit them directly.
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Jascha Achterberg retweeted
Incredible opportunity to join one of the most exciting companies in London
Replying to @CallosumAI
@CallosumAI is hiring in London! We're building the infrastructure for heterogeneous compute - making many models, on many chips, behave as a single coherent, co-evolving system. Five MTS roles open across the AI infra stack. Link below!
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Jascha Achterberg retweeted
Join us!
Replying to @CallosumAI
@CallosumAI is hiring in London! We're building the infrastructure for heterogeneous compute - making many models, on many chips, behave as a single coherent, co-evolving system. Five MTS roles open across the AI infra stack. Link below!
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Jascha Achterberg retweeted
Replying to @CallosumAI
@CallosumAI is hiring in London! We're building the infrastructure for heterogeneous compute - making many models, on many chips, behave as a single coherent, co-evolving system. Five MTS roles open across the AI infra stack. Link below!
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Jascha Achterberg retweeted
capitulos nuevos de the office hechos con IA antes que gta 6, desaparezcan el mundo
May 14
Claude's first day at Dunder Mifflin
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Jascha Achterberg retweeted
Really enjoyed recording this with @FinnMurphy12 and @soundboy and fanning the flames of British optimism!
The UK in 2050. If you listen to the SF bubble you'd think it's well on the way to being a failed state. But things are cooking and Britannia won't go gentle into the night. @matthewclifford & @soundboy think there is no branch of the tech tree from which the UK could not plausibly produce the next trillion-dollar company. On this episode of Forecast 2050 Matt, the cofounder of @join_ef and Ian, co-founder of @pluralplatform we talk about what Britain's resurgence could look like over the next 25 years. - Europe's risk aversion is a bigger threat than American superiority. - Career politicians won’t survive in the new multipolar world. - Why the pro-growth movement is losing the culture war — and how to win it back. - How Britain could win the AI Age by 2050. youtu.be/cD3UtHVr99o
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Jascha Achterberg retweeted
Start here. Scale here. Win Everywhere.
Sovereign AI. Launching Tonight. 🇬🇧
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Jascha Achterberg retweeted
Tomorrow the @UKSovereignAI fund launches with £500m to back the best of British tech. The AI economy is growing 23x faster than the UK economy in general. This initiative guarantees that the public gets to benefit from the explosive growth of the AI sector. LETS GO
Introducing Sovereign AI, the Government’s new £500m venture fund. Sovereign AI will support founders from day one to start here, scale here and win everywhere. sovereignai.gov.uk
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Jascha Achterberg retweeted
Great to see this on X. This is something I created during my PhD time 20 years ago.
This is a healing grid by Japanese artist Ryota Kanai. If you stare at the center, the irregularities start to heal themselves because your brain strongly prefers to see regular patterns.
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Jascha Achterberg retweeted
It’s obviously a shame that OpenAI have paused some of their data centre investment here in the UK, and high energy prices need to be tackled for everybody - from household bills to heavy industry and AI. But the UK, as is this case with many other countries, is not the natural home for many gigafactory-scale DCs aimed at huge training runs. While we must have this capacity to some degree ( and you can apply now to SovAI’s AIRR compute programme to access it! ), DCs of Stargate size are probably best suited to cold countries or areas with extremely cheap domestic energy supply, and perhaps one day space. What the UK must do is be the best place for companies in areas of AI where we have abundant strengths to start and scale - novel chips, heterogenous compute systems, edge inference, photonics, new model architectures, frontier models in biology, chemistry, physical sciences, voice, embodied AI, advanced engineering in robotics, agent security. The list goes on. I hope the companies building in those sectors get the same press coverage for each of their technical breakthroughs & commercial milestones as this OpenAI story has got!
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Jascha Achterberg retweeted
Dynamical systems theory, energy-based models, and transformers: what could be better? Check out our new #ICLR2026 paper and a great writeup from @DimaKrotov!
GPT is a standard paradigm for language models: 👉 tokens → neural net → shifted tokens Energy-based models (Hopfield style) is a different paradigm: 👉 tokens evolve on an energy landscape What if you could have both? In our new #ICLR2026 paper, we build a hybrid: • Tokens evolve over time (like an energy-based model) • Dynamics runs on a learned energy landscape • Then converges to a steady state, which defines the next token So instead of a single forward pass: 👉 prediction = a dynamical process Our model, called NRGPT: • Combines GPT-style inference with EBM dynamics • Enables iterative refinement of token representations • Opens the door to more stable architectures And it’s not just theory: ✅ Strong results on ListOps ✅ Works on real text Paper: arxiv.org/abs/2512.16762. What would you build with dynamical tokens?
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Jascha Achterberg retweeted
interesting extrapolation from @bratton @blaiseaguera @profjamesevans on what 'societies of thought' (vs chains of thought) mean for agentic AI & an intelligence explosion
you're going to be hearing a lot more about heterogeneous computing if, like me about ~1 week ago, you're like 'wtf is that', this would be a good place to start:
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Jascha Achterberg retweeted
We know about cosmological dark matter despite being unable to measure it because, without it, galaxies would fall apart. By analogy, let's talk about "cognitive dark matter" (CDM): brain functions that meaningfully shape behavior but are hard to infer from behavior alone. New paper! 🧵👇
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Jascha Achterberg retweeted
Aging may feel gradual… but what if it’s not? In our paper out today, we tracked fish continuously from puberty until death. This gave us a unique view of how aging unfolds across the adult lifespan. 🧵
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Jascha Achterberg retweeted
I'm not sure about the details but I'm convinced that how to publish and create impact is due to change very significantly in the near future. The value of writing and reading 8 page PDFs is rapidly dropping. What is the right way to publish the nugget of a research contribution?
If I was a grad student today, I would: 1) Not write papers, 2) push my (agent-written) code to a public repo ~weekly, 3) maintain (via agents) a writeup.tex (manually verified) and a skill.md in the repo, and 4) work towards establishing skill usage as the new "citation" format.
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Jascha Achterberg retweeted
The UK gov just said they're investing £500m in AI startups. And they launched a 🔥 new website which celebrates british innovation, from the first algorithm to AlphaFold.
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Going to Cosyne? There will be a "Biologically-inspired Artificial Intelligence: Challenges and Opportunities" workshop on Monday 16th! 🧠 Exciting lineup of speakers alongside the opportunity to present your NeuroAI poster, more info on program & poster signup in thread below!
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We are also hosting a NeuroAI poster session during the lunch break! If you are presenting a NeuroAI-related poster at Cosyne, you are welcome to put it up in our workshop room so attendees can find relevant work they might otherwise have missed. Signup: forms.gle/kzefm2FtVuRkouVx6
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Super looking forward to the workshop! Alongside the talks and poster session, we are also working on an industry careers in NeuroAI meet-up for Early Career Researchers. All details and updates can be found on our website: sites.google.com/view/cosyne…
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