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Jascha Achterberg
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Jascha Achterberg✓

@achterbrain

Co-Founder @CallosumAI building Intelligent Systems through co-design of novel hardware & algorithms, at least loosely inspired by nature. Also @Cambridge_Uni.

1.1K Following2K Followers967 Posts
  1. Jascha Achterberg✓@achterbrain
    One of the most fun things about Callosum has been to build partnerships with the best hardware companies on earth to work together on building entirely new heterogeneous system! Massive thanks to all the folks at @cerebras @Rebellions_inc @dMatrix_AI @intel @NormalComputing @nvidia @Supermicro @awscloud @SambaNovaAI @AxeleraAI @CorticalLabs and many more (all listed in the blog) for partnering with us!
    Callosum @CallosumAI
    With our $100M seed round, we announce our first wave of global compute partnerships, flagship among them @CerebrasSystems. Partnerships spanning silicon, infrastructure and geography. The path to intelligence that is orders-of-magnitude better, cheaper, and more sovereign.
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  2. Callosum@CallosumAI
    With our $100M seed round, we announce our first wave of global compute partnerships, flagship among them @CerebrasSystems. Partnerships spanning silicon, infrastructure and geography. The path to intelligence that is orders-of-magnitude better, cheaper, and more sovereign.
    Download
    383624.8K
  3. Jascha Achterberg✓@achterbrain
    Jascha Achterberg
    RT @EricElmoznino: Couldn't be happier to announce my new paper on defining compositional structure — and generating it! I see this project as the culmination of my PhD, as it unifies all my interests: compositionality, compression, structure, and open-endedness. More below!
    02606
  4. Jascha Achterberg✓@achterbrain
    Jascha Achterberg
    RT @CallosumAI: We have been named in the Budget’s prospectus 2026, as one of the most strategically important companies backed by the UK government. We’re building heterogeneous compute: bringing different AI chips and models together into complete systems. Thank you to the @UKSovereignAI and @ARIA_research. We are just getting started.
    0505
  5. Jascha Achterberg✓@achterbrain
    Jascha Achterberg
    RT @CallosumAI: Our CTO @achterbrain joined @nvidia on stage at the start-up day of GTC Berlin, alongside Clara Cornu, @talfanevans, @nouralhassan and Matteo Sarcinella. He discussed how Callosum runs heterogeneous workloads efficiently across every generation and type of NVIDIA hardware, and what it takes to scale new technology companies fast in Europe. Thanks for having us @nvidia
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  6. Jascha Achterberg✓@achterbrain
    Jascha Achterberg
    RT @UKSovereignAI: We’ve already backed some of the most ambitious AI companies being built in Britain. From AI infrastructure and safety to science and new technologies, our portfolio spans some of the most exciting areas of AI, all with ambitious founders building from the UK. Let’s hear from a few of the companies we’ve backed so far. @CallosumAI | Augur | @Basecamp_Res
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  7. Jascha Achterberg✓@achterbrain
    Jascha Achterberg
    RT @WoodingtonBen: We’ve raised a $45m Series A, co-led by @foundersfund and The @OpenAI Startup Fund, to build cancer therapy that learns. Technology is rapidly changing medicine, but data loops and rapid adjustments are still largely missing. When you start cancer treatment, knowing whether what you’re doing is working is too slow. Clearly there is a better way. Build systems to watch cancer in real time, then feed that data into a system that itself can treat the disease. This seeds a future where, unlike drugs, we develop medicine that continuously learns to improve itself. We've been building neurotechnology and BCI platforms to do just that. @coherenceneuro
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  8. Jascha Achterberg✓@achterbrain
    Jascha Achterberg
    RT @ktoya_me: Introducing A massive isometric pixel map of London, based on amazing NYC demo by @_coenen from 9 months ago My agent created the dataset, finetuned qwen image LoRA adapter, did a multiday inference run and built an efficient tile viewer!
    Andy Coenen @_coenen
    I wanted to share something I built over the last few weeks: is a massive isometric pixel art map of NYC, built with nano banana and coding agents. I didn't write a single line of code.
    0255012
  9. Andy Coenen✓@_coenen
    I wanted to share something I built over the last few weeks: is a massive isometric pixel art map of NYC, built with nano banana and coding agents. I didn't write a single line of code.
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    3646548K1.7M
  10. Jascha Achterberg✓@achterbrain
    Jascha Achterberg
    RT @Ronanchamberss: how can you not be bullish on Kanishka? - calls out bullshit - knows his shit - knows what he doesn't know - stays curious - gets shit done (very quickly and all the time) - he's always right at the centre of where he should be When we interviewed him yesterday The Minister reminded me that there will come a time when he is no longer in that position, it made me sad, and I told him.
    etn. @etnshow
    UK AI Minister @KanishkaNarayan in response to the call for a ban on Super-Intelligence in the UK after an open-letter was circulated by 40 MP's to stop AI: "We don't have super-intelligence in this country. We actually, as you say, don't have a position to be able to do so anytime soon. The most effective thing we can do is build the capability to test and understand risks that others are perpetrating as a result of them building it." "Harden defenses. Huge uplift needed in our cyber capabilities to defend ourselves...convene the world, as we will do in the run-up to the G20, to be able to shape others' destinies through our values, and ultimately build in Britain over the long term." "When I think about the political conversation I sort of feel like people want to just pull whatever lever they can see rather than the lever that actually ends up making a difference in the real world." "This isn't about being pro-regulation or anti-regulation. For me, it's not a question of what's the tactical mechanism. It's a question of what's going to drive change in the world."
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  11. etn.✓@etnshow
    UK AI Minister @KanishkaNarayan in response to the call for a ban on Super-Intelligence in the UK after an open-letter was circulated by 40 MP's to stop AI: "We don't have super-intelligence in this country. We actually, as you say, don't have a position to be able to do so anytime soon. The most effective thing we can do is build the capability to test and understand risks that others are perpetrating as a result of them building it." "Harden defenses. Huge uplift needed in our cyber capabilities to defend ourselves...convene the world, as we will do in the run-up to the G20, to be able to shape others' destinies through our values, and ultimately build in Britain over the long term." "When I think about the political conversation I sort of feel like people want to just pull whatever lever they can see rather than the lever that actually ends up making a difference in the real world." "This isn't about being pro-regulation or anti-regulation. For me, it's not a question of what's the tactical mechanism. It's a question of what's going to drive change in the world."
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    51522178.9K
  12. Jascha Achterberg✓@achterbrain
    Jascha Achterberg
    RT @DidiKieran: Very fortunate to have contributed a bit to these two new Nature papers from the Baker lab! Especially exciting cool to see that MLIPs hold signal for this cool chemistry. Stay tuned for more! Metalloproteases: Cysteine Proteases:
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  13. Jascha Achterberg✓@achterbrain
    Jascha Achterberg
    RT @DanAkarca: The real end goal of scaling heterogeneous compute is to make new discoveries and uncover new knowledge that change the world excited to back @sotalikesfuture with @inherent_labs @fractile_ai & @ARIA_research!
    Society for Technological Advancement @sotalikesfuture
    SoTA Scientific Parallelism Hackathon | 21st-22nd November | London Which scientific questions could we investigate better if computation were faster or could run at a greater scale? The Society for Technological Advancement (@sotalikesfuture), supported by Callosum (@CallosumAI), Inherent Labs (@inherent_labs), the Advanced Research + Invention Agency (@ARIA_research) and Fractile (@fractile_ai), is holding a hackathon to tackle open scientific questions that could benefit from faster computation or experiments at a greater scale. Contestants will use parallel computing on challenges across biology, chemistry, physics, materials science, astronomy, and Earth sciences – pushing GPUs to their limits and rethinking architectures for this new paradigm.
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  14. Society for Technological Advancement✓@sotalikesfuture
    SoTA Scientific Parallelism Hackathon | 21st-22nd November | London Which scientific questions could we investigate better if computation were faster or could run at a greater scale? The Society for Technological Advancement (@sotalikesfuture), supported by Callosum (@CallosumAI), Inherent Labs (@inherent_labs), the Advanced Research + Invention Agency (@ARIA_research) and Fractile (@fractile_ai), is holding a hackathon to tackle open scientific questions that could benefit from faster computation or experiments at a greater scale. Contestants will use parallel computing on challenges across biology, chemistry, physics, materials science, astronomy, and Earth sciences – pushing GPUs to their limits and rethinking architectures for this new paradigm.
    Download
    25204.1K
  15. Jascha Achterberg✓@achterbrain
    Really enjoyed discussing our work at Callosum with @BSchech and @gabyllorenzi on the Compute 100 podcast! Link to episode below but also make sure to check out their other episodes, it generally is an amazing podcast they are hosting!
    The Compute 100 @thecompute100
    Today’s guest is @achterbrain , co-founder and CTO of @CallosumAI . Jascha’s bet is that the future of compute is heterogeneous: different chips working together on different parts of a problem. Beyond the multichip future, we discuss: - What neuroscience taught Jascha about designing computing systems - How chipmakers discover what their hardware is best at - Where thermodynamic, biological, and quantum computing could fit - Hiring people who welcome having their ideas challenged - Building an AI infrastructure company in London Timestamps: 0:00 Introduction 2:55 What heterogeneous computing actually means 11:02 From PhD research to Callosum 18:36 Turning heterogeneous compute into a product 23:24 Sourcing compute and working with chipmakers 28:53 Matching workloads to the right hardware 34:24 What heterogeneous computing can do today 38:29 The next waves of chips 48:02 Building the team 51:33 Why build in London? 56:11 Helping enterprises upgrade their compute stacks 1:01:04 Fundraising and building momentum 1:03:40 Where specialization wins, and where it doesn’t Listen to the show, and follow along for new episodes every Tuesday.
    0120505
  16. Jascha Achterberg✓@achterbrain
    Jascha Achterberg
    RT @thecompute100: Today’s guest is @achterbrain , co-founder and CTO of @CallosumAI . Jascha’s bet is that the future of compute is heterogeneous: different chips working together on different parts of a problem. Beyond the multichip future, we discuss: - What neuroscience taught Jascha about designing computing systems - How chipmakers discover what their hardware is best at - Where thermodynamic, biological, and quantum computing could fit - Hiring people who welcome having their ideas challenged - Building an AI infrastructure company in London Timestamps: 0:00 Introduction 2:55 What heterogeneous computing actually means 11:02 From PhD research to Callosum 18:36 Turning heterogeneous compute into a product 23:24 Sourcing compute and working with chipmakers 28:53 Matching workloads to the right hardware 34:24 What heterogeneous computing can do today 38:29 The next waves of chips 48:02 Building the team 51:33 Why build in London? 56:11 Helping enterprises upgrade their compute stacks 1:01:04 Fundraising and building momentum 1:03:40 Where specialization wins, and where it doesn’t Listen to the show, and follow along for new episodes every Tuesday.
    0809
  17. Jascha Achterberg✓@achterbrain
    Jascha Achterberg
    RT @BSchech: @CallosumAI raised a $100M seed on the idea that the future of compute is many different chips, each handling the part of the problem it’s best at. Great conversation with @achterbrain about how they’re building it. New episode of The Compute 100.
    The Compute 100 @thecompute100
    Today’s guest is @achterbrain , co-founder and CTO of @CallosumAI . Jascha’s bet is that the future of compute is heterogeneous: different chips working together on different parts of a problem. Beyond the multichip future, we discuss: - What neuroscience taught Jascha about designing computing systems - How chipmakers discover what their hardware is best at - Where thermodynamic, biological, and quantum computing could fit - Hiring people who welcome having their ideas challenged - Building an AI infrastructure company in London Timestamps: 0:00 Introduction 2:55 What heterogeneous computing actually means 11:02 From PhD research to Callosum 18:36 Turning heterogeneous compute into a product 23:24 Sourcing compute and working with chipmakers 28:53 Matching workloads to the right hardware 34:24 What heterogeneous computing can do today 38:29 The next waves of chips 48:02 Building the team 51:33 Why build in London? 56:11 Helping enterprises upgrade their compute stacks 1:01:04 Fundraising and building momentum 1:03:40 Where specialization wins, and where it doesn’t Listen to the show, and follow along for new episodes every Tuesday.
    03010
  18. Jascha Achterberg✓@achterbrain
    Jascha Achterberg
    RT @gabyllorenzi: grateful to have @achterbrain on today’s episode of The Compute 100! our conversation with Jascha stretched from the philosophy and science behind “all roads lead to heterogeneity” to helping chipmakers understand where their product fits in market. thanks Jascha for joining!
    The Compute 100 @thecompute100
    Today’s guest is @achterbrain , co-founder and CTO of @CallosumAI . Jascha’s bet is that the future of compute is heterogeneous: different chips working together on different parts of a problem. Beyond the multichip future, we discuss: - What neuroscience taught Jascha about designing computing systems - How chipmakers discover what their hardware is best at - Where thermodynamic, biological, and quantum computing could fit - Hiring people who welcome having their ideas challenged - Building an AI infrastructure company in London Timestamps: 0:00 Introduction 2:55 What heterogeneous computing actually means 11:02 From PhD research to Callosum 18:36 Turning heterogeneous compute into a product 23:24 Sourcing compute and working with chipmakers 28:53 Matching workloads to the right hardware 34:24 What heterogeneous computing can do today 38:29 The next waves of chips 48:02 Building the team 51:33 Why build in London? 56:11 Helping enterprises upgrade their compute stacks 1:01:04 Fundraising and building momentum 1:03:40 Where specialization wins, and where it doesn’t Listen to the show, and follow along for new episodes every Tuesday.
    02010
  19. Jascha Achterberg✓@achterbrain
    Jascha Achterberg
    RT @mattbotvinick: My book, AI and Political Freedom, is out today. It argues that AI safety isn’t only a technical and regulatory problem. No matter what measures we take on those fronts, AI won’t be safe unless we also reinforce the foundations of constitutional democracy. The book lays out specific steps for ensuring that political freedom survives alongside powerful AI. Link in the first reply.
    09011
  20. Jascha Achterberg✓@achterbrain
    Jascha Achterberg
    RT @dcolascione: Is there any deeper intuition about why, so often, optimal results are hideous and just barely beat "testament to God's design" elegant solutions we'd previously discovered?
    Mark Lundeberg @MarkLundeberg
    @teortaxesTex this but for everything
    021010
  22. Jascha Achterberg✓@achterbrain
    Jascha Achterberg
    RT @jamesgheys1: I’m very excited to share our new paper, led by the very talented Jack Bowler, a postdoc in the lab! We all know that the way we learn something matters. But how does a training curriculum actually shape how the brain learns to solve a problem? a 🧵 1/N
    02909
  23. Jascha Achterberg✓@achterbrain
    Jascha Achterberg
    RT @DanAkarca: “We're in the early stages now of this Cambrian explosion. What are the boundary cases where we want certain tasks on certain models on certain silicon? We’re making that programmable. This is where all the frontier performance is going to come from.” Proud to launch our new partnership between @CallosumAI and @cerebras. Thanks to Andy for a great conversation!
    0805
  25. Jascha Achterberg✓@achterbrain
    Jascha Achterberg
    RT @GabrielBna1: New paper! I'm presenting it TOMORROW at #ALIFE2026! What if a chip could heal itself the way a brain does: not with a spare part, but by rewiring around the wound? Meet Self-Organising Digital Circuits. 👉 (go murder some logic gates, I'll explain) 🧵⬇️
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  26. Jascha Achterberg✓@achterbrain
    Jascha Achterberg
    RT @dMatrix_AI: Heterogeneous compute is becoming the standard for AI infrastructure. @CallosumAI just announced their global partner network. d-Matrix is proud to be part of the US ecosystem alongside @Intel, @AMD, and others. No single chip does every job well. The right workload deserves the right silicon. Corsair was built for exactly this: purpose-built for inference, with the memory bandwidth and efficiency to make AI systems practical instead of unsustainable. Read more: #AIInference #HeterogeneousCompute
    0805
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