Claude Haiku 4.5 gives users a new option for when they want near-frontier performance with much greater cost-efficiency. For example, Sonnet 4.5 can break down a complex problem into multi-step plans, then orchestrate a team of multiple Haiku 4.5s to complete subtasks in parallel.
benchmark link
Claude Sonnet 4.5 is the best coding model in the world. It's the strongest model for building complex agents. It’s the best model at using computers. And it shows substantial gains in reasoning and math.
In Claude Code, Anthropic added checkpoints—one of our most requested features—that save your progress and allow you to roll back instantly to a previous state. We've refreshed the terminal interface and shipped a native VS Code extension. Anthropic added a new context editing feature and memory tool to the Claude API that lets agents run even longer and handle even greater complexity. In the Claude apps, we've brought code execution and file creation (spreadsheets, slides, and documents) directly into the conversation. And we've made the Claude for Chrome extension available to Max users who joined the waitlist last month.
They also giving developers the building blocks they uses themselves to make Claude Code. Anthropic calling this the Claude Agent SDK. The infrastructure that powers our frontier products—and allows them to reach their full potential—is now yours to build with.
see more on Anthropic following post:
https://www.anthropic.com/news/claude-sonnet-4-5
The Claude Agent SDK
Anthropic spent more than six months shipping updates to Claude Code, so they know what it takes to build and design AI agents. According to Anthropic They solved hard problems: how agents should manage memory across long-running tasks, how to handle permission systems that balance autonomy with user control, and how to coordinate subagents working toward a shared goal.
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