[BUG] 1M token issue

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?

Bug Report: Cowork Forces 1M Context — Breaks on Pro Plan
Summary
Cowork sessions fail with "Usage credits required for 1M context" error on Pro plan,
even when usage limits have not been reached. User cannot use Cowork at all.
Error Message
API Error: Usage credits required for 1M context · turn on usage credits at
claude.ai/settings/usage, or use --model to switch to standard context
Environment

Plan: Pro
Product: Claude Cowork (Claude Desktop app)
Platform: [macOS / Windows — please fill in]
App version: [check Claude Desktop → About — please fill in]

Usage at Time of Error
Confirmed via claude.ai/settings/usage — limits were NOT reached:

Current session: 20% used (resets in ~4h 29min)
Weekly (all models): 2% used (resets Monday)
Routine runs: 0 of 5 used

This confirms the error is unrelated to usage limits.
What's Wrong
Cowork automatically selects the 1M context model variant without user input.
On Pro plan, this triggers a usage credits gate and blocks the session entirely.
Usage limits had NOT been reached when the error occurred.
Attempting to switch to a different model (e.g. "4.5") does not resolve the issue
as that model string does not exist — valid options are 4.6 and 4.7 only.
Expected Behaviour

Cowork should default to standard context (200K) on Pro plan
OR the 1M context window should be accessible within Pro plan limits
without requiring additional usage credits
User should not be blocked from using Cowork entirely

Actual Behaviour

Cowork forces 1M context variant automatically
Error fires immediately, before any usage limits are reached
No in-UI way to switch context window size in Cowork

Steps to Reproduce

Open Claude Desktop on Pro plan
Start a new Cowork session
Send any message
Error immediately returned: "Usage credits required for 1M context"

Related Issues

#63908 — Same error in Cowork on Pro plan
#63060 — Same error reported May 2026
#62199 — Claude Code changed default to 1M context without notifying Pro users
#62063 — 1M context selected automatically with no override
#33154 — Cowork forces [1m] flag causing instant errors

Workaround (partial)
Enabling usage credits at claude.ai/settings/usage unblocks the error
but should not be required for standard Cowork usage on a paid Pro plan.

What Should Happen?

see above

Error Messages/Logs

Error Message
API Error: Usage credits required for 1M context · turn on usage credits at 
claude.ai/settings/usage, or use --model to switch to standard context
Environment

Steps to Reproduce

see above

Claude Model

None

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

4.6

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_