Anthropic has released Claude Opus 4.5 , its new flagship model, which the company says is the most powerful version yet and ranks at the top of the class for practical programming, agent-based productivity scenarios. The model has also seen significant improvements in in-depth search, analytics, and presentation capabilities. Opus 4.5 is now available via apps, APIs, and across all three major cloud technologies. SOTA in real engineering In the SWE-bench Verified test, the new model shows the best result among all frontier models : Anthropic particularly emphasizes that Opus 4.5 represents a significant step forward compared to Sonnet 4.5, overcoming tasks