3 months ago
- Claude Sonnet 5 is the most agentic Sonnet model, capable of planning, tool use, and autonomous operation.
- It offers performance close to Opus 4.8 at lower prices, with improvements in reasoning, tool use, coding, and knowledge work over Sonnet 4.6.
- Safety assessments show it has a lower rate of undesirable behaviors than Sonnet 4.6 and is safer in agentic contexts, but it has a lower ability to perform cybersecurity tasks compared to Opus models.
- It is available across all plans with introductory pricing of $2 per million input tokens and $10 per million output tokens until August 31, 2026, after which it increases to $3 and $15 respectively.
- Feedback from early access partners highlights its improved agentic capabilities, such as completing complex tasks, self-checking outputs, and efficient performance in coding and automation.
- The model includes cyber safeguards enabled by default, similar to those in Claude Opus 4.7 and 4.8, to block dangerous cyber usage.