Kimi K3 rocks the AI industry as Moonshot AI undercuts closed-source American competitors on price — but the huge 2.8T open-weight model still needs serious hardware to deploy at scale | Tom's Hardware

A new AI model from Chinese firm Moonshot AI has had its "DeepSeek moment," causing major disruption in the global AI market and spooking Western developers. Kimi K3 is an open-weight model, with 2.8 trillion parameters, making it the largest open-weight AI model ever released. Internal benchmarks have it competing with models like GPT 5.5 and Claude Opus 4.8, and Arena.ai awarded it the number one spot in its Frontend Code Arena test, even beating out Claude Fable 5.

It doesn't win every benchmark, and reports that suggest Kimi K3 is much slower than frontier models from companies like Anthropic and OpenAI. All benchmarked results are drawn from API access, too, so can't be verified until Moonshot releases the weights on July 27.

But that hasn't reduced the impact of this model's release on the AI industry. With Kimi K3 cutting costs compared to the competition, it's drawing a lot of interest from companies hoping to reduce AI spend. For comparison's sake, OpenRouter tables Kimi K3 at $3/15 per million inputs and outputs. OpenAI's GPT 5.6 Sol is more expensive than that, at $5/30, and Anthropic's Claude Fable 5 is $10/50. So, it's fair to say that Kimi K3 is incredibly competitive on price, especially when tabled against the costs of those closed-source Western AI models.

Microsoft is also considering Kimi K3 for Copilot, while the White House may ban Chinese models entirely. Meanwhile, memory makers are rubbing their hands together with glee, as Kimi K3 occupies up to 1.4 TB of memory, given its huge number of parameters.

Fast, cheap, or American?

The past few months have been full of talk about the frontier AI models from Anthropic and OpenAI. Mythos was big and scary until OpenAI had something equivalent. Then Fable debuted, and it was even better but not so scary anymore. Apparently.

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But these models were also proving very expensive to run, at a time when companies with big AI deployments were questioning the return on that investment. Uber limited AI use by developers, and others killed the AI-boosting leaderboards they'd championed towards the end of 2025.

So when Moonshot debuted Kimi K3 with running costs a third that of western frontier models for the same results, the world took notice. In much the same way as DeepSeek's R1 debut in 2025 showcased how models could be trained for less -- even if there may have been some corporate espionage involved -- and Kimi K3 is holding up a similar mirror to Western frontier developers.

Where DeepSeek R1 was lean, though, Kimi K3 is huge -- so large, the developers are calling it the first open 3T-class system, and China's largest AI model to date. According to Bloomberg's sources, its sparsity ratio is the highest yet seen by any AI model. That's the measurement of how many parameters are activated for each task relative to the model's size, showcasing both Kimi K3's overall size and its impressive efficiency in the same breath.

This doesn't eclipse the most capable models from companies like Anthropic and OpenAI in every test. Arena.ai's rankings put it within the top 10 on most of its tests, but only coming out on top in a couple. But if Kimi K3 can offer results comparable to more expensive alternatives like Claude and ChatGPT, it's likely to draw a lot of interest from Western companies, and it appears to be already doing so.

Enough that it's revived calls for the U.S. to gatekeep access to international AI models, in a similar manner to how it recently pushed for companies to share exclusive model access with the U.S. government before a wider release.

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In comparison, Moonshot is opening up Kimi K3 to the wider world. As part of releasing the model weights to the public, it will allow companies and organizations to run the model themselves without using Moonshot's cloud services, making adoption easier and potentially cheaper.

But it won't be cheap, as Kimi K3 still needs serious hardware investment to get up and running, by virtue of its massive VRAM requirements alone.

A Win for (Chinese) Memory Makers

As large companies with major AI deployments began to scale back their AI initiatives in 2026, there's been a growing concern that all that infrastructure everyone's been spending hundreds of billions of dollars on might not be needed. Meta just started selling excess compute in a pivot to cloud services, and xAI unloaded the entire compute capacity of Colossus 1 to Anthropic at a discounted rate.

But if Kimi K3 is the way the industry might go, hardware demands are unlikely to fall, and as Jevon's paradox suggests, greater efficiency is only likely to increase usage, not shrink it.

Those trillions of parameters need to be stored in memory, and Bloomberg's estimates suggest Kimi K3 will require close to 1.5 TB of memory. It would need masses of high-end Nvidia GPUs to deploy it effectively, making the number of companies and organizations that could actually run Kimi K3 at scale rather small.

So even those who do look to leverage Kimi K3 to reduce operating costs will still need powerful hardware, and specifically a lot of memory. This suggests that the major competition for cutting-edge models is not going to crater costs like we initially saw with DeepSeek R1 last year, which means memory makers are going to continue making money hand over fist, due to their outsized demand and limited supply.

But Chinese memory suppliers like CXMT are on the rise, and on track to eclipse Micron's DRAM wafer capacity by the end of the year. Smaller local AI models will also continue to be further optimized for domestic hardware, reducing the stranglehold that some large tech companies have on the AI supply chain.

Competitive, efficient, but unwieldy

Kimi K3 is an industry disruptor and is already raising questions over AI costs, capabilities, and access. It's shown that you don't need proprietary models locked to a specific service to achieve frontier-model capabilities. It's also cheaper to run, but Moonshot achieved this with a sparse model that still requires massive hardware investment to operate.

Even though Kimi K3 activates only a fraction of its trillions of parameters for each query, it still needs all of them to be stored. Deploying this model at scale requires substantial memory capacity, bandwidth, and interconnects, even if its compute demands aren't as strenuous.

The open-weight nature means it has very real potential to supplant usage away from Western frontier models in the short term, but it isn't about to change the story we've been told on required infrastructure. Kimi K3 needs the same kind of hardware to run as GPT 5.6 and Fable — which is likely to be far more of a limiting factor on its adoption than any kind of government blocks.