Anthropic Debuts Claude Sonnet 4.5 With Improved Coding

Anthropic contiguous introduced Claude Sonnet 4.5, which the institution says is the "best coding exemplary successful the world," outperforming GPT-5 and Gemini 2.5 Pro. It's besides the strongest exemplary for gathering analyzable agents and utilizing computers, positive Anthropic says that it shows important gains successful reasoning and mathematics compared to Opus 4.1.


Along with Claude Sonnet 4.5, Anthropic added a caller terminal interface and checkpoints to Claude Code. Checkpoints service arsenic prevention points, redeeming your advancement truthful you tin rotation backmost to a erstwhile authorities arsenic necessary.

The Claude apps present enactment codification execution and record instauration for making spreadsheets, slides, and documents straight successful the conversation. Claude for Chrome is disposable arsenic well, with Anthropic allowing immoderate Max users to beta trial the feature. There's besides a Claude Agent SDK that's disposable for gathering agents.


According to Anthropic, Claude Sonnet 4.5 has improved capabilities and extended information grooming to amended its behavior, truthful determination has been a simplification successful sycophancy, deception, power-seeking, and the inclination to promote delusional thinking.

Claude Sonnet 4.5 is disposable everyplace starting today, and Anthropic recommends that users upgrade.
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