Which, Claude has the same deal. You can get a 1M context window, but it's gonna cost ya. If you run /model in claude code, you get:

    Switch between Claude models. Applies to this session and future Claude Code sessions. For other/previous model names, specify with --model.
    
       1. Default (recommended)   Opus 4.6 · Most capable for complex work
       2. Opus (1M context)        Opus 4.6 with 1M context · Billed as extra usage · $10/$37.50 per Mtok
       3. Sonnet                   Sonnet 4.6 · Best for everyday tasks
       4. Sonnet (1M context)      Sonnet 4.6 with 1M context · Billed as extra usage · $6/$22.50 per Mtok
       5. Haiku                    Haiku 4.5 · Fastest for quick answers