Anthropic Adjusts Service Policy, Restricting Third-Party Tools from Accessing Claude via Subscription Plans
On April 3, 2026, AI company Anthropic sent an email to users announcing an adjustment to its terms of service. Effective 3 PM ET on April 4 (3 AM on April 5, Beijing Time), the company will no longer permit users to use authentication tokens from its subscription services (such as Claude Pro and Max plans) to call Claude models within third-party tools like OpenClaw. This change means that a large number of developers relying on this workflow will have to switch to the more expensive pay-as-you-go API model.
Sudden Policy Shift: From Monthly Subscriptions to Pay-As-You-Go
According to Anthropic’s official announcement, this policy change will first be enforced on the well-known AI productivity tool OpenClaw, with plans to gradually expand it to all third-party toolchains. Previously, many developers paid a fixed monthly subscription fee, ranging from $20 to $200, to achieve high-frequency, automated calls to Claude models through OpenClaw, at a cost far lower than using the official API. In some high-usage scenarios, API bills could run into thousands of dollars.
The sudden implementation of this policy has sent shockwaves through the developer community. Many startups and individual developers who built automated workflows based on this model are now facing a dramatic overnight budget increase and the need to re-architect their applications in a very short time. As a transitional measure, Anthropic is offering affected users one-time API credits, equivalent to one month of their subscription fee, which must be claimed before April 17.
Behind the Scenes: Business Competition and Technical Containment
The timing of this policy adjustment has fueled widespread industry speculation, with many believing it is directly related to OpenClaw’s founder, Peter Steinberger, recently joining Anthropic’s main competitor, OpenAI.
In the months leading up to the final ban, Anthropic had already taken a series of measures to restrict OpenClaw:
- Brand Separation: In late January 2026, Anthropic took legal action to demand that the tool, then named “Clawdbot,” be renamed.
- Technical Blockade: On January 9, Anthropic deployed server-side detection mechanisms to block requests from non-official clients using subscription tokens, temporarily disabling OpenClaw’s core functionality.
- Terms of Service Update: In mid-February, Anthropic updated its terms of service to explicitly define the use of OAuth tokens from Free, Pro, and Max accounts in any third-party tool as a violation.
- Feature Replication: Simultaneously, Anthropic accelerated the development and launch of its native tool, Claude Cowork. Its built-in features like Dispatch (remote desktop control) and Channels (connecting to Telegram/Discord) highly overlap with OpenClaw’s core selling points. Tech publication Semafor previously reported that Anthropic’s Chief Commercial Officer, Paul Smith, acknowledged receiving a large volume of customer requests for the company to offer official features similar to OpenClaw’s.
Peter Steinberger himself confirmed on social media that he had attempted to communicate with Anthropic to maintain the status quo, but ultimately only managed to delay the policy’s enforcement by one week.
The Platform’s Multiple Considerations: Cost, Security, and Strategy
From Anthropic’s perspective, this decision was not without reason. The company faces realistic pressures on multiple fronts:
- Unsustainable Economic Model: A large number of users were obtaining API-level usage, far exceeding the value of their low-cost subscriptions. This placed immense pressure on Anthropic’s server resources and financial costs. Closing this “loophole” is a necessary step to maintain business sustainability.
- Security and Controllability Risks: Third-party tools bypass official telemetry and monitoring systems, creating a management blind spot. Notably, OpenClaw was recently disclosed to have a high-severity vulnerability (CVE-2026-25253) with a CVSS score of 8.8, which could allow attackers to steal user authentication tokens via a malicious link. Banning unofficial toolchains helps mitigate such security risks.
- Vertically Integrated Platform Strategy: Shutting down third-party tools while promoting its own Claude Cowork is a classic “Platform Lock-in” strategy employed by tech giants. By integrating users and functions into its own ecosystem, Anthropic can better control the user experience, data flow, and commercialization path, thereby maximizing long-term value.
Open vs. Closed: The Battle for the Future of the AI Ecosystem
Anthropic’s move has sparked a fierce debate in the developer community about platform openness. Many developers feel that platforms encourage third-party innovation in the early stages of ecosystem development, only to retract control through policy changes once the ecosystem matures, thereby damaging community trust. This pattern is not uncommon in tech history, from social media platforms banning third-party clients to app stores tightening their policies, with developers often being the ones who ultimately lose out.
Interestingly, OpenAI has adopted a completely opposite strategy in this matter. Not only does OpenAI explicitly permit its subscription services to be used in tools like OpenClaw, but it also announced in March 2026 that it would provide free ChatGPT Pro access to maintainers of several open-source projects, including OpenClaw, demonstrating a stance that embraces the open-source community.
As the final deadline arrives, developers face a difficult choice: accept the high API costs, migrate to Anthropic’s native tools, or abandon the Claude platform altogether in favor of other, more open alternatives. Whatever the outcome, this event marks a new phase in the AI industry, shifting from early-stage open collaboration to a period of clearer boundaries between giants and a move towards more closed ecosystems.
