[FEATURE]

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

The 200K context window is the single biggest limitation of Claude Code for anyone working on production-scale projects. Mid-session, Claude loses track of the broader architecture, forgets file relationships, and requires constant re-explanation. This forces frequent session restarts and breaks the flow of complex work.

Opus 4.6 already supports 1M tokens via the API. Claude Code — the tool that would benefit the most from extended context — is still stuck at 200K.

Proposed Solution

Enable the 1M token context window in Claude Code as an opt-in setting (e.g. claude config set context_window 1m or --extended-context). Let developers working on large codebases maintain full project understanding throughout long sessions without degradation or forced restarts.

Alternative Solutions

_No response_

Priority

Critical - Blocking my work

Feature Category

CLI commands and flags

Use Case Example

_No response_

Additional Context

_No response_