Anthropic’s new Claude Sonnet 4.6 promises Opus-level coding at Sonnet pricing

February 18, 2026

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Anthropic on Tuesday launched Claude Sonnet 4.6, the latest version of its mainstream model.

This new version promises to almost match the company’s flagship Opus 4.6 model, which launched barely two weeks ago, in most tasks, but at the significantly lower price of $3/$15 per million input/output tokens (compared to $5/$25 for the Opus model).

Just like the previous version and Opus 4.6, Sonnet 4.6 offers a 1-million-token context window in beta.

Benchmarks

Compared to the older Sonnet model, Sonnet 4.6 easily outperforms it on virtually…

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