In May, Anthropic announced two new AI systems, Opus 4 and Sonnet 4. Now, less than six months later, the company is introducing Sonnet 4.5, and calling it the best coding model in the world to date. Anthropic’s basis for that claim is a selection of benchmarks where the new AI outperforms not only its predecessor but also the more expensive Opus 4.1 and competing systems, including Google’s Gemini 2.5 Pro and GPT-5 from OpenAI. For instance, in OSWorld, a suite that tests AI models on real-world computer tasks, Sonnet 4.5 set a record score of 61.4 percent, putting it 17 percentage points above Opus 4.1.
At the same time,
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