Anthropic PBC
Acquisitions
5
Major Deals Covered
This page covers 5 major deals from 2025 to 2026, each with its price where disclosed and the reason behind it.
| Company | Year | Price | Purpose |
|---|---|---|---|
| Humanloop | 2025 | Undisclosed | Team acquisition covering prompt management, model evaluation and observability for enterprise customers |
| Bun | 2025 | Undisclosed | JavaScript and TypeScript runtime and toolchain that Claude Code and the Claude Agent SDK are built on |
| Vercept | 2026 | Undisclosed | Computer use research, so Claude can operate live desktop and web applications |
| Stainless | 2026 | Undisclosed | Compiler that turns API specifications into SDKs, command line tools and MCP servers |
| Mendral | 2026 | Undisclosed | Team working on automated continuous integration fixes, flaky test triage and dependency review |
2026
Computer use research, so Claude can operate live desktop and web applications
Added a Seattle team that had raised $50 million for agents that drive software interfaces
Announced February 25, 2026; team folded into Anthropic's agent work
2026
Compiler that turns API specifications into SDKs, command line tools and MCP servers
Took ownership of the toolchain behind official Claude SDKs, which rival labs also used
Announced May 18, 2026 on undisclosed terms; the shared public SDK generator was wound down
2026
Team working on automated continuous integration fixes, flaky test triage and dependency review
Added engineers to the Claude Platform group
Announced July 21, 2026; the hosted Mendral product was wound down
2025
Team acquisition covering prompt management, model evaluation and observability for enterprise customers
Added an enterprise tooling team; the hosted Humanloop product was wound down
Founders and most of the team joined Anthropic in August 2025
2025
JavaScript and TypeScript runtime and toolchain that Claude Code and the Claude Agent SDK are built on
Brought the runtime behind Claude Code in house; Anthropic said Claude Code had reached $1 billion of run-rate revenue
Announced December 2, 2025; Bun continues as an open-source project
Growth runs through three channels. First, agent products: Claude Code went from internal experiment to general availability in May 2025 and over $2.5 billion of run-rate revenue by February 2026, and Cowork extended the same engine to non-technical work in January 2026. Second, cloud co-selling, with Claude the only frontier model on Amazon Bedrock, Google Cloud Vertex AI and Microsoft Azure Foundry. Third, buying capability instead of rebuilding it: Bun in December 2025 for the JavaScript toolchain behind Claude Code, Vercept in February 2026 for computer use, Stainless in May 2026 for SDK generation, and the Mendral team in July 2026 for continuous integration automation. Regulated sectors are an explicit target, with Claude for Enterprise available to HIPAA-covered organizations and verification programs for biology and cybersecurity users.
Anthropic charges for Claude in four ways. Developers and enterprises pay per million tokens on the Claude API, where cache reads cost far less than fresh input ($0.20 per million against $4 on Claude Opus 5.5). Individuals and teams pay subscriptions across Claude Pro, Max, Team and Enterprise plans. Agent products carry their own budgets: Claude Code, generally available since May 2025, passed $2.5 billion of run-rate revenue by February 2026, and Cowork brought the same engine to non-technical work in January 2026. Claude is also resold through Amazon Bedrock, Google Cloud Vertex AI and Microsoft Azure Foundry, letting customers spend committed cloud budget on Claude. Spending is concentrated: the two largest customers each accounted for about 12 percent of 2025 revenue, while more than 500 customers spent over $1 million on an annualized basis as of February 2026, and eight of the Fortune 10 are customers.
Anthropic took on the Humanloop team in August 2025, acquired Bun in December 2025, Vercept in February 2026 and Stainless in May 2026, and brought in the Mendral team in July 2026.
Bun is the JavaScript and TypeScript runtime and toolchain that Claude Code and the Claude Agent SDK are built on. Anthropic bought it in December 2025 for speed and stability in Claude Code, and announced at the same time that Claude Code had reached $1 billion of run-rate revenue.
Vercept, a Seattle startup that had raised $50 million, worked on agents that operate live desktop and web applications. The February 2026 deal strengthened Anthropic's computer use capability.
Stainless built the compiler that turns API specifications into SDKs, command line tools and MCP servers, and its output shipped inside official libraries for several AI labs. Anthropic acquired it on May 18, 2026 on undisclosed terms and wound down the shared public generator.
Both were team acquisitions. Humanloop's founders and most of its team joined in August 2025 with expertise in prompt management and model evaluation, and the Mendral team joined in July 2026 to work on Claude Platform after automating continuous integration fixes and test triage.
Terms have not been disclosed for any of the deals. Press reporting put the Stainless price above $300 million, and Anthropic did not confirm a figure.
Mostly, yes. It has contracted up to one million Google TPUs, about $30 billion of Microsoft Azure capacity, up to five gigawatts of new AWS capacity, 2 gigawatts of AMD Instinct MI450 GPUs, roughly 460 megawatts from Nscale in West Virginia and a 20-year TeraWulf data center lease in Kentucky.
It backs companies building on Claude through the Anthology Fund, a $100 million initiative run with Menlo Ventures, and in May 2026 helped create Ode, an AI services company formed with Blackstone, Hellman & Friedman and Goldman Sachs.
As a hyper-focused foundational model builder, Anthropic dedicates the vast majority of its billions in funding directly to computing power and talent, rather than acquiring other startups.
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