Anthropic locks Sonnet 5 pricing at $2, canceling 50% increase

Anthropic canceled a planned 50 percent price increase on Claude Sonnet 5, permanently locking the model's $2-per-million input and $10-per-million output token pricing as it races to secure enterprise AI workloads ahead of a fall IPO.

The decision gives developers a stable cost baseline for agentic tasks, which typically require multiple model calls that drive token costs higher, Anthropic said in its announcement Monday.

Sonnet 5 launched in June at $2 per million input tokens and $10 per million output tokens, with the higher $3 and $15 rates originally scheduled for August 31. Anthropic described Sonnet 5 as its "most agent-capable Sonnet model," able to plan autonomously and call browsers and terminals to complete complex tasks. The company filed a confidential S-1 with the SEC on June 1, after raising $65 billion in a Series H round that valued it at $965 billion, with annualized revenue above $47 billion as of early May.

The pricing freeze comes as Anthropic expands compute capacity — a roughly $45 billion agreement with SpaceX in May and a $35 billion AI XPV Platform with Broadcom, Apollo and Blackstone in June — while more than 1,000 enterprise customers each spend over $1 million annually. Locking Sonnet 5 pricing shifts competition from raw capability toward unit economics, pressuring rivals including OpenAI's GPT-5 and Google's Gemini to match on total cost of ownership.

A Pricing Bet on Volume Over Margin

The permanent rate undercuts the industry's typical introductory-pricing model, where discounts expire after a set window. For Anthropic, the trade-off is straightforward: accept lower per-token revenue to drive usage volume and deepen enterprise lock-in before its public debut. The company has not disclosed the financial impact of the change, but the decision shows confidence that scale will offset the forgone margin.

The move also arrives as Anthropic prepares a successor. Claude Sonnet 5.5, codenamed "Fennec," is expected to double the context window to 2 million tokens with faster inference and stronger agentic capabilities, approaching flagship Fable 5 performance while keeping Sonnet-tier pricing, according to reports. A cheaper, more capable mid-tier model would intensify pressure on OpenAI and Google in the enterprise segment.

Compute Costs Keep Climbing

Anthropic's infrastructure bill keeps rising even as it holds prices flat. Beyond the SpaceX and AI XPV agreements, the company in July struck a deal with AMD for tens of billions of dollars in AI servers, with up to $5 billion in investment and up to two gigawatts of Instinct MI450 capacity beginning in 2027. Amazon, its largest shareholder at 9 percent, plans to receive over $100 billion in compute fees from Anthropic over the next decade through AWS, which has customized Trainium chips for the model maker.

For investors, the pricing freeze is a bet that Anthropic can grow usage faster than its compute costs. The company's $965 billion valuation implies roughly 20 times its $47 billion annualized revenue run rate, a premium that depends on sustained enterprise adoption. Amazon, Google, Microsoft and Nvidia — which hold stakes of 9 percent, 6 percent, 7 percent and 5 percent respectively — stand to gain from both equity appreciation and the compute orders Anthropic directs their way. Zoom, which invested about $51 million at a $4.1 billion valuation in 2023, saw its shares jump more than 9 percent on the IPO filing news, with the stake now worth an estimated $2 billion to $4 billion.

This article is for informational purposes only and does not constitute investment advice.