It seems that extra-usage is required to use the 1M context window for Sonnet 4.6. This differs from Sonnet 4.5, which allows usage of the 1M context window with a Max plan.

```

/model claude-sonnet-4-6[1m]

⎿ API error: 429 {"type":"error","error": {"type":"rate_limit_error","message":"Extra usage is required for long context requests."},"request_id":"[redacted]"}

```

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minimaxir 5 hours ago | parent | next [-]

Anthropic's recent gift of $50 extra usage has demonstrated that it's extremely easy to burn extra usage very quickly. It wouldn't surprise me if this change is more of a business decision than a technical one.

	▲	WXLCKNO 4 hours ago \| parent [-]
		I capped my extra usage to that free 50$ and hit 108% usage. Nice.

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8note 2 hours ago | parent | prev [-]

think that just needs extra usage enabled? or actually using extra usage?

i cant believe that havent updated their code yet to be able to handle the 1M context on subscription auth