"Anthropic has released Claude Sonnet 4.5, an update of the company's coding model that features extended autonomous operation, greater context awareness, and enhanced tool usage. Claude Sonnet 4.5 shows significant improvements on real-world computer tasks, agentic coding, agentic terminal coding, and agentic tools use, as well as reasoning and math, according to Anthropic. Claude Sonnet 4.5 can be accessed by developers using claude-sonnet-4-5 via the Claude API."
"Introduced September 29, Cloud Sonnet 4.5 offers what the company describes as major advances for agents. The coding model can work independently for hours while maintaining clarity and focus on incremental progress, Anthropic said. Fact-based progress updates are provided about what has been accomplished. With increased context awareness, Claude Sonnet now tracks token usage throughout conversations, receiving updates after each tool call."
Claude Sonnet 4.5 is an updated coding model with extended autonomous operation, greater context awareness, and enhanced tool usage. The model demonstrates improvements on real-world computer tasks, agentic coding, agentic terminal coding, agentic tools use, reasoning, and math. Developers can access Claude Sonnet 4.5 via claude-sonnet-4-5 through the Claude API. Pricing remains $3 per million input tokens and $15 per million output tokens. The model can operate independently for hours, provide fact-based progress updates, track token usage throughout conversations, and receive updates after each tool call to reduce premature task abandonment and improve long-running task execution.
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