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4.7 is the first opus model that’s had the 1 M context window available on Bedrock.

Not true. Opus and Sonnet 4.6 support 1m context on Bedrock.

I've had Opus 4.6 1M and Sonnet 4.6 1M for months now on Bedrock.

Their docs may be lying but they say 200k for opus 4.6. And yes 1M was on sonnet for Claude enterprise.