Introducing Claude Sonnet 5 Anthropic has launched Claude Sonnet 5, the latest iteration of its agentic AI model series, designed to deliver advanced capabilities in planning, tool integration, and autonomous execution at a lower cost than previous models. This release marks a significant step forward in the agentic AI era, bridging the gap between Sonnet-class and Opus-class models while offering competitive pricing and improved performance. Sonnet 5 is positioned as a substantial upgrade over its predecessor, Sonnet 4.6, with notable improvements in reasoning, tool use, coding, and knowledge work. Performance evaluations show it closely rivals Opus 4.8, a more broadly capable model, but at a significantly lower cost. The model’s agentic capabilities are highlighted through comparisons with earlier versions, demonstrating its ability to handle complex tasks such as multi-step software engineering workflows, cybersecurity assessments, and automated workflows with greater efficiency. Pricing for Sonnet 5 is structured to make it accessible across all user tiers. It is the default model for Free and Pro plans and is available to Max, Team, and Enterprise users. During its introductory launch period through August 31, 2026, Sonnet 5 is priced at $2 per million input tokens and $10 per million output tokens, after which the rates will increase to $3 per million input tokens and $15 per million output tokens. Developers can access the model via the Claude API using the identifier claude-sonnet-5. The model’s performance is benchmarked against Sonnet 4.6 and Opus 4.8 in evaluations such as agentic search (BrowseComp) and computer use (OSWorld-Verified). Sonnet 5 is described as a strict improvement over Sonnet 4.6, offering a balance of cost and performance that makes it a compelling alternative to Opus 4.#anthropic #mythos_preview #claude_sonnet_5 #sonnet_4_6 #opus_4_8
