Highlights
- Anthropic's flagship Fable 5 model has plateaued at just 11% of enterprise spending on Anthropic tools, based on Ramp payments data covering 70,000 companies cited by the Financial Times.
- The cheaper Claude Opus 5, launched in late July at roughly half Fable 5's per-token price, has already overtaken it in enterprise usage.
- The older Opus 4.8 model surged from 15% of spend in early June to more than 50% by late July as businesses chased cost savings over raw capability.
- The trend lands weeks before investors reportedly target a $2 trillion valuation for an Anthropic IPO as soon as October, which would be the largest public listing in history.
Anthropic's most expensive and most capable model is struggling to win over the corporate customers it was built for. According to a post from crypto and markets commentary account Coin Bureau, businesses are directing just 11% of their Anthropic spending toward Fable 5, the company's flagship model, even as cheaper alternatives handle the bulk of day-to-day enterprise workloads. The figure comes from a Financial Times report built on payments data from Ramp spanning 70,000 companies, and it lands at an awkward moment: Anthropic is widely reported to be preparing a public listing that investors hope will value the company at $2 trillion or more.
What the Spending Data Shows
Ramp's transaction data shows Fable 5's 11% share has essentially stalled since launch, with older and cheaper models absorbing most enterprise demand instead. Claude Opus 5, released in late July at about $5 per million input tokens and $25 per million output tokens, undercuts Fable 5's $10-and-$50 pricing by roughly half while delivering comparable performance on most tasks. It has already overtaken Fable 5 in enterprise spending. The shift isn't limited to the newest release: Opus 4.8, an older and even cheaper model, jumped from 15% of Anthropic-related spend in early June to more than 50% by late July, according to the same Ramp figures reported by the FT.
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Why Businesses Are Downgrading
The pattern runs against the industry's usual assumption that enterprise customers gravitate toward the most powerful model available regardless of cost. Anthropic investors and analysts told the FT that Fable 5's high price, combined with the fact that older models can already handle the majority of business use cases, is driving the shift. Accel partner Miles Clements, whose firm has put nearly $1 billion into Anthropic, summed up the dynamic bluntly: most enterprise users don't need frontier-level performance for routine work like drafting, summarization, or customer support automation, so price sensitivity wins out once a cheaper model is good enough.
Why It Matters for Anthropic's IPO Math
The spending pattern matters because it cuts against the growth story investors are pricing in. Anthropic backers reportedly expect the company's annualized revenue to reach $100 billion to $120 billion by the end of 2026, up from a fraction of that at the start of the year, underpinning talk of a $2 trillion valuation in an October IPO that would top SpaceX's $1.77 trillion June listing as the largest ever. But if the highest-margin, top-priced model can't hold market share against Anthropic's own cheaper products, it raises questions about how much pricing power the company retains as customers optimize spend. Anthropic's flagship also reportedly costs more than two-and-a-half times as much to run as OpenAI's comparable model, adding competitive pressure from outside the company as well as from within its own product line.
What to Watch Next
The next concrete checkpoint is whether Anthropic and its bankers move forward with an October IPO filing at anything close to the reported $2 trillion target, a figure investors and executives reportedly haven't yet settled on internally. Watch also for Anthropic's next model release cadence and pricing decisions — if enterprise customers keep migrating toward the cheapest viable option, Anthropic may need to adjust how it prices future frontier models before it goes public, or lean harder on volume from cheaper tiers to hit the revenue targets underpinning its valuation pitch.
FAQ
What is Claude Fable 5 and why does its spending share matter?
Fable 5 is Anthropic's flagship, most expensive AI model. Its stalled 11% share of enterprise spending matters because it suggests businesses aren't paying up for top-tier performance, which could pressure Anthropic's revenue and pricing power ahead of a planned IPO.
How much cheaper is Claude Opus 5 than Fable 5?
Opus 5 costs about $5 per million input tokens and $25 per million output tokens, roughly half of Fable 5's $10 and $50 pricing, while offering comparable performance for most enterprise tasks.
Is Anthropic's $2 trillion IPO valuation confirmed?
No. It's investor speculation reported by the Financial Times and other outlets, not a figure Anthropic has confirmed, and reports say company executives haven't settled on a target valuation even internally.
When could Anthropic go public?
Investors reportedly expect a listing as soon as October 2026, which, at a $2 trillion valuation, would surpass SpaceX's $1.77 trillion June 2026 IPO as the largest ever.
