Sonnet 5 is now the default on Free and Pro, and available to Max, Team, and Enterprise users. It's live across all Claude apps and the Claude Platform today, with introductory pricing through August 31: https://t.co/4nNWO80Er7
AI Weekly's analysis
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- Anthropic released Claude Sonnet 5 on June 30, 2026, calling it 'the most agentic Sonnet model yet' and pitching it for autonomous browser and terminal use.
- Through August 31, 2026 Sonnet 5 costs $2 per million input tokens and $10 per million output, then steps to standard rates of $3 and $15.
- A new tokenizer means the same input can map to roughly 1.0 to 1.35 times more tokens than prior Anthropic models, partly offsetting the headline discount.
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