August 18, 2025 - Or watched it fumble through multi-step tasks like a sleep-deprived intern? Meet Claude 4.0 Sonnet — launched May 22nd — a model that doesn’t just answer questions but thinks through them.

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.

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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.

April 8, 2025 - I don’t understand why this particular 4th model CONSTANTLY hallucinates, reports the existence of something in the code that is not there and offers such erroneous solutions that I am shocked. The previous Claude 3.7 So…

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.

3 days ago - Anthropic announced Sonnet 4.5 on September 29, 2025, presenting it as the company's most capable model at the time for coding, agents, and computer use. Pricing stayed at $3 per million input tokens and $15 per million output tokens. On SWE-bench Verified, Anthropic reported a 77.2% score ...

Claude Sonnet 4 builds on that with improved contextual memory, deeper reasoning, and more natural conversation flow, making it better suited for complex tasks and longer interactions.

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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Opus 4 offers industry-leading reasoning and agentic capabilities, while Sonnet 4 provides an optimal balance of cost and performance for enterprise-scale deployments. With full integration into the Databricks Data Intelligence Platform, enterprise teams can now securely build, evaluate, and govern Claude-powered AI agents using their own data — with centralized governance and observability.

May 23, 2025 - It surpasses its predecessor, Claude Sonnet 3.7, across coding and reasoning while responding more precisely to steering. Use cases include coding tasks such as code reviews and bug fixes, AI assistants, efficient research, and large-scale content generation and analysis. Claude Opus 4 and Claude Sonnet 4 are generally available as a Model-as-a-Service (MaaS) offering on Vertex AI.