Two separate billing accounts rate-limited simultaneously when on same IP — independent quotas not respected

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

I have two completely separate Claude Code accounts on two separate billing subscriptions under two different organizations:

Account A: Organization—Organization A, Plan—Claude Team
Account B: Organization — Organization B, Plan — Claude Team
Both accounts are active on the same physical machine (two VS Code windows), connected to the same internet connection.

What Should Happen?

Each account should have an independent 5 hr session quota and weekly quota, enforced per-account server-side. When Account A hits its limit, Account B should continue working unaffected.

Error Messages/Logs

Both accounts show identical usage percentages (94–95% session, 37% weekly) and hit the rate limit simultaneously, being told to wait the same cooldown period at the same time. This makes the two separate paid subscriptions functionally equivalent to one—I am unable to continue working on either account when the limit is reached.

Steps to Reproduce

Sign into two separate Claude Team accounts (different orgs, different billing) on the same machine in two VS Code windows
Use Claude Code actively on both
Observe both accounts showing identical usage stats
Observe both accounts being rate-limited at the same time

Suspected cause:
Rate limiting appears to be applied at the IP address level in addition to (or instead of) per-account, causing all Claude Code traffic from one IP to share a single quota ceiling regardless of account or billing.

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

Version 2.1.199

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

OS: macOS
Claude Code version: latest
Both accounts: Claude Team plan, separate organizations, separate billing
Impact:
Two paid subscriptions provide no additional capacity when used from the same network. This is unexpected behavior for independently billed accounts.