Anthropic Abandons Around £4.5 Billion Bid to Acquire Israeli AI Startup Decart

It was shaping up to be one of the biggest deals in AI infrastructure. In August 2026, Bloomberg reported that Anthropic — the San Francisco company behind the Claude family of AI models — was in advanced talks to acquire Decart AI, an Israeli startup that had spent the past few years quietly solving one of the industry’s most pressing problems: how to squeeze more performance out of existing chips without buying more of them. The proposed price tag was around six billion dollars, or roughly £4.5 billion. Then, in the space of a few weeks, it all fell apart.

By 8 September 2026, multiple reports citing people familiar with the matter — including Bloomberg, Israeli business newspaper Globes, and financial outlet Calcalist — confirmed that Anthropic had decided not to proceed after completing due diligence on Decart’s business and technology. Neither company has publicly explained why.

What Decart Actually Does

Founded around 2023, Decart has built software designed to make AI training and inference cheaper on existing GPU fleets. That’s not a glamorous pitch, but it matters enormously right now. The cost of running large AI models has become one of the defining pressures on companies like Anthropic, which must continually train and serve models at massive scale. Decart’s proposition, is that you don’t always need to buy more chips — you just need to use the ones you have better.

The startup attracted serious attention. In May 2026, it closed a funding round of around 300 million dollars, led by Radical Ventures, that valued the company at nearly four billion dollars — around £3 billion at current rates. The Anthropic approach, at six billion dollars, would have represented a hefty premium on that figure. For Decart’s investors, it must have looked like a remarkable exit in the making.

A Short, Intense Courtship

The timeline here is striking. Bloomberg first reported active acquisition talks on 13 August 2026. By early September, the deal was dead. That’s a compressed window — weeks of due diligence, not months — and it suggests Anthropic moved quickly both to explore and to exit.

What prompted the withdrawal? Neither side is saying. But the possibilities are not hard to imagine: concerns about technical robustness, questions about how cleanly Decart’s software would integrate into Anthropic’s existing infrastructure, or simply a reassessment of whether the price was justified. Paying a premium over a nearly four-billion-dollar valuation is a significant commitment, and Anthropic is reportedly preparing for a possible initial public offering. Preserving capital and strategic flexibility ahead of that moment would be a reasonable consideration.

Anthropic itself is no small operation. Following its Series F fundraising round led by ICONIQ, the company carries a post-money valuation of around 183 billion dollars — roughly £137 billion. It has the means to pursue large acquisitions. The decision not to proceed, then, appears to be about fit rather than finances.

The Blow to Decart

For Decart, the mood is rather different. Israeli business media describe the collapsed deal as a morale blow for the startup and its backers, given the scale of expectations that had built around a high-profile exit. Being assessed and then passed over — especially at that valuation — is not the kind of outcome that goes unnoticed in the startup world.

And yet it may not be the end of the relationship. Reports suggest that while the acquisition is off the table, both companies may still consider other forms of collaboration. A technology partnership or joint initiative would give Anthropic access to Decart’s efficiency capabilities without the cost and complexity of a full buyout. Whether that materialises is unclear.

What It Says About the Wider Market

This episode fits into a broader pattern. Large AI model developers — Anthropic, OpenAI, Google DeepMind, and others — are all grappling with the spiralling cost of compute. Training frontier models requires enormous GPU resources, and inference costs add up fast at scale. The logical response is to seek tighter control over infrastructure and efficiency technologies, either by building them in-house or by acquiring the companies that make them.

But as this deal shows, the valuation expectations attached to AI infrastructure startups can be eye-watering. Decart’s nearly four-billion-dollar valuation, achieved just months after its founding, reflects genuine investor enthusiasm — and genuine uncertainty about what these companies are ultimately worth. Some analysts suggest Anthropic’s withdrawal may cool appetite for similar mega-deals in the near term, as larger firms grow more cautious about paying very high premiums after deeper technical scrutiny.

Dror Nir, a commentator writing for Israeli tech outlet CTech, noted the deal’s collapse as an example of how quickly sentiment can shift in this sector — where a multibillion-pound valuation can be reassessed after just a few weeks of close examination.

What This Means for Kent Residents

There’s no direct impact on daily life in Kent from this particular deal falling through. But the broader story matters to anyone who uses AI-powered services — whether through the NHS, local council digital platforms, or tools like Claude itself — because decisions about AI infrastructure and cost-efficiency shape how affordable and reliable those services become over time. If Anthropic’s strategy around compute costs shifts as a result of this and similar decisions, the knock-on effects could eventually reach the cloud-based AI tools used by Kent’s public sector, businesses, and universities, even if that influence takes time to filter through.