May 23, 2025 - Anthropic launched the next generation of Claude models today—Opus 4 and Sonnet 4—designed for coding, advanced reasoning, and the support of the next generation of capable, autonomous AI agents.

May 23, 2025 - As of May 22–23, 2025, Anthropic has officially released two variants of Claude 4—Claude Opus 4 and Claude Sonnet 4—bringing hybrid reasoning, extended thinking, and frontier coding capabilities to production users.

May 23, 2025 - 0 minLearn to create AI-powered applications with the latest AI developer tools, including the OpenAI API, Hugging Face, and LangChain. ... 933Discover what all of the DeepSeek hype was really about! Build applications using DeepSeek's R1 and V3 models. ... Learn about Claude 3.7 Sonnet's hybrid approach of combining reasoning mode and generalist mode, key benchmarks, and how to access it via web or API. ... Claude 3.5 Sonnet outperforms GPT-4o and Gemini Pro 1.5 in several benchmarks and introduces a cool new feature: Artifacts.

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May 25, 2025 - Claude is now being connected with a person. I wonder why they chose that formulation? It feels delightfully retro to me for some reason. I ran a diff between the published Opus 4 and Sonnet 4 prompts and the only differences are in the model information at the top—and a fullstop after {{currentDateTime}} which is present for Opus but absent for Sonnet:

May 22, 2025 - Today, we’re thrilled to announce that we are rolling out Claude Sonnet 4, Anthropic’s latest and most capable coding model, to all of our users in the coming days, starting today.

August 1, 2025 - The Generative AI Mode Comparing Claude Sonnet 4.0, ChatGPT 4.1, and ChatGPT 4.1 Beast Mode in Simple Web App Creation A Quick Experiment on the Coding Support Friendliness of Each AI My first time …

Claude Opus 4 and Sonnet 4 are hybrid models offering two modes: near-instant responses and extended thinking for deeper reasoning. The Pro, Max, Team, and Enterprise Claude plans include both models and extended thinking, with Sonnet 4 also available to free users.

September 29, 2025 - We’ve conducted extensive testing and evaluation of Sonnet 4.5, working with external experts to ensure it meets our standards for safety, security, and reliability. In the model card for this release, we discuss new safety results in several categories. We're seeing state-of-the-art coding performance from Claude Sonnet 4.5, with significant improvements on longer horizon tasks.

When we release new model snapshots, we migrate aliases to point to the newest version of a model, typically within a week of the new release. While aliases are useful for experimentation, we recommend using specific model versions (e.g., claude-sonnet-4-5-20250929) in production applications to ensure consistent behavior.

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Sonnet 4 is optimized for practical everyday use, providing advanced reasoning capabilities while maintaining efficiency and responsiveness in diverse internal and external scenarios.

May 22, 2025 - Amazon Web Services (AWS) has announced the availability of Claude Opus 4.5 in Amazon Bedrock, which joins the existing Claude models available to customers, including the recently launched Claude Haiku 4.5 and Claude Sonnet 4.5.