Anthropic put its most powerful model, Fable 5, on the shelf more than two months ago, but real-world procurement data from US enterprise buyers has delivered a less flattering verdict.
According to the Financial Times, citing payment services firm Ramp, Ramp's ledger covers SaaS spend across 70,000 companies. Fable 5 accounts for only about 11% of total Anthropic tool spend, and that share has stabilized, with no visible upward drift. In other words, the model marketed as the smartest has not become the default.
What makes this strange is the consumption pattern frontier-model labs have taken for granted over the past few years: stronger models drive more usage, and older models naturally fade. Fable 5 clearly did not replicate that curve. The FT cites analysts and investors pointing to two main causes: Fable 5's price tag is high, and older models already meet the requirements of most enterprise tasks; meanwhile, a meaningful slice of workloads does not need Fable 5's ceiling capability, so customers have no incentive to upgrade.
If this trend persists, the impact will not be limited to Anthropic. Ramp's data shows that frontier AI labs have plowed tens of billions of dollars of R&D into training ever-larger and more complex models, betting that "stronger equals more revenue." Fable 5's weak demand is directly challenging that business model.
For Anthropic's IPO expectations, the curve is also an unfavorable signal. Investors had floated a potential valuation of $2 trillion or higher for Anthropic, with a listing possibly as soon as next month. A story of "our flagship isn't selling" makes that valuation number look more fragile on the roadshow.
That said, the 11% figure deserves cautious interpretation. It reflects relative Anthropic-tool spending among the 70,000 US companies in Ramp's sample, not market-wide share. A still-evolving product could climb again in a few quarters; it could also, as analysts suggest, settle into the role of a "toy for a handful of high-end users."
One more layer of context: Anthropic is also fighting copyright lawsuits from Sony and Warner, which accuse the company of using copyrighted musical works to train its Claude models, with potential damages in the billions of dollars. Anthropic, squeezed between commercialization and legal risk, is in the phase where its flagship model most needs to anchor the narrative—and Fable 5's market feedback is clearly not the story Anthropic wanted.
So the real takeaway is not "Fable 5 has failed." A 11% share shows it still has a market; it just hasn't become mainstream. The capability ceiling of frontier models is decoupling from actual enterprise demand. When the amount a company is willing to pay for the strongest model falls well short of expectations, what gets repriced is not just Anthropic's valuation but the R&D cadence and commercial story of every frontier-model lab.
(Core data for this piece comes from the Financial Times and Ramp's enterprise spend sample; the original reporting is at https://www.ft.com/content/5ee49718-c258-4f01-aa32-7e5b76ae5245)