The best AI for developers

“Claude Sonnet 4.5 amplifies GitHub Copilot's core strengths. Our initial evals show significant improvements in multi-step reasoning and code comprehension—enabling Copilot's agentic experiences to handle complex, codebase-spanning tasks better. We expect these gains to deliver meaningful value to developers moving from idea to implementation with confidence.”

“We're seeing state-of-the-art coding performance from Claude Sonnet 4.5, with significant improvements on longer horizon tasks. It reinforces why many developers using Cursor choose Claude for solving their most complex problems.”

“For Devin, Claude Sonnet 4.5 increased planning performance by 18% and end-to-end eval scores by 12%—the biggest jump we've seen since the release of Claude Sonnet 3.6. It excels at testing its own code, enabling Devin to run longer, handle harder tasks, and deliver production-ready code more consistently.”

“Sonnet 4.5 represents a new generation of coding models. It's surprisingly efficient at maximizing actions per context window through parallel tool execution, for example running multiple bash commands at once. We've also noticed it spontaneously writing and executing unit tests to validate its own work, making our parallel Cascade runs way more effective.”

“Claude Sonnet 4.5 resets our expectations—it handles 30+ hours of autonomous coding, freeing our engineers to tackle months of complex architectural work in dramatically less time while maintaining coherence across massive codebases.”

"Claude Sonnet 4.5's edit capabilities are exceptional — we went from 9% error rate on Sonnet 4 to 0% on our internal code editing benchmark. Higher tool success at lower cost is a major leap for agentic coding. Claude Sonnet 4.5 balances creativity and control perfectly, thoroughly completing tasks without over-engineering."

“The architectural awareness is remarkable—Claude Sonnet 4.5 reduces tool calls by 21% and messages by 29% while maintaining quality through intelligent multi-agent orchestration.”

"Claude Sonnet 4.5 reduced average vulnerability intake time for our Hai security agents by 44% while improving accuracy by 25%, helping us reduce risk for businesses with confidence."

“Claude Sonnet 4.5 delivers measurable improvements for Next.js tasks. It is particularly good at building and linting Next.js code, showing up to a 17% improvement over its predecessor. We're excited to integrate it into v0 and AI Gateway at launch, giving developers instant access to these advances.”

“Claude Sonnet 4.5's intelligence is immediately noticeable—it makes better use of Augment's codebase context, handles longer-horizon tasks, and opens up new agentic possibilities we're actively exploring.”

“Claude Sonnet 4.5 acts as a powerful thinking partner: it builds detailed plans, grasps intent beyond words, and incorporates feedback thoughtfully—helping us work through complex development tasks more effectively.”

“Claude Sonnet 4.5 is excellent at software development tasks, learning our codebase patterns to deliver precise implementations. It handles everything from debugging to architecture with deep contextual understanding, transforming our development velocity.”