
We have found Sonnet 4.6 to be a substantial upgrade over Sonnet 4.5, approaching Opus performance, and tackling large scale, long horizon tasks such as iteratively improving green field codebases:

Claude@claudeai
This is Claude Sonnet 4.6: our most capable Sonnet model yet. It’s a full upgrade across coding, computer use, long-context reasoning, agent planning, knowledge work, and design. It also features a 1M token context window in beta.
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