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Investing.com -- Anthropic has released Claude Sonnet 4.5, which the company describes as "the best coding model in the world" with enhanced capabilities for building complex agents and using computers.
The new model shows substantial improvements in reasoning and math compared to previous versions, according to Anthropic. The company reports that Claude Sonnet 4.5 leads on the SWE-bench Verified evaluation, which measures real-world software coding abilities, and has achieved a 61.4% score on OSWorld, a benchmark for AI models performing real-world computer tasks.
Alongside the model release, Anthropic has introduced several product upgrades. Claude Code now features checkpoints that allow users to save progress and roll back to previous states. The terminal interface has been refreshed, and a new VS Code extension brings Claude directly to the integrated development environment.
For developers using the Claude API, Anthropic has added context editing to automatically clear stale context and a memory tool that stores information outside the context window, helping to manage long-running tasks without hitting context limits.
The company has also made the Claude for Chrome extension available to users who joined the waitlist last month, and introduced the Claude Agent SDK, which provides developers with the infrastructure used to build Claude Code.
Claude Sonnet 4.5 is available on the Claude Developer Platform, Amazon Bedrock, and Google Cloud’s Vertex AI, with pricing remaining the same as Sonnet 4 at $3/$15 per million tokens.
Anthropic claims this is their "most aligned frontier model yet," with improvements in reducing behaviors like sycophancy, deception, and power-seeking. The model is being released under Anthropic’s AI Safety Level 3 protections, which include filters to detect potentially dangerous inputs and outputs.
As a temporary feature, Anthropic is offering "Imagine with Claude," a five-day research preview available to Max subscribers that demonstrates the model generating software in real time.