Claude Code v2.1.76 just shipped: Opus now defaults to 1M token context. 5x more room before the model starts compressing your conversation history.
What this means in practice:
If you've been deep in a multi-file refactor and noticed Claude "forgetting" earlier decisions, that's context compression. The window fills up, older parts get summarized to make room.
With 1M tokens, that wall moves way further out. Longer sessions stay coherent. Complex builds don't lose context halfway through.
Who benefits most:
This is a Max plan feature. If you're on Max ($100/month for Claude Pro or the equivalent tier), this is a direct upgrade to your Claude Code workflow.
If you're on the $20 plan:
You're fine. If your sessions aren't getting compressed, the standard context window handles most normal workflows. You'd only notice the difference during extended, multi-hour sessions with lots of code changes.
Bottom line:
More context = fewer re-explanations = faster builds.
Anyone already running long sessions on Max? Drop what changed for you.