"Just four months after Anthropic released Claude Sonnet 4.5, and a week after the company debuted Opus 4.6, the AI giant is back with Claude Sonnet 4.6, a huge upgrade over the previous version. Also: Anthropic says its new Claude Opus 4.6 can nail your work deliverables on the first try This new Sonnet 4.6 model, available now, shows improved coding performance, better computer use skills, upgraded long-context reasoning, better agent planning, and improvements to knowledge work and design."
"As with Opus 4.6, Sonnet 4.6 now includes a 1 million-token context window (in beta). This allows for much longer and more complex work sessions without requiring a session reset or compaction. Sonnet 4.6 is now the default model for free and Pro tier users across the various Claude interfaces. Pricing for those plans (as well as for Sonnet API use) has not increased."
"Anthropic provides two branded AI models at different price points, Sonnet and Opus. Opus has always been the Cadillac of AI models, available at higher tiers and increased per-token API call pricing. Sonnet has been more of an entry-level model, still quite capable, but with substantially lower resource usage, enabling Anthropic to deploy it to free users and keep its token price down."
Claude Sonnet 4.6 delivers major model upgrades including improved coding performance, better computer use, enhanced long-context reasoning, stronger agent planning, and gains in knowledge work and design. The model now includes a 1 million-token context window in beta, enabling much longer and more complex sessions without session resets or compaction. Sonnet 4.6 becomes the default model for free and Pro users across Claude interfaces while plan and API pricing remain unchanged. Sonnet narrows the performance gap with Opus by approaching Opus-level intelligence at lower cost and resource usage, preserving accessibility for free-tier users.
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