by Anthropic
Claude Sonnet 4 is a hybrid reasoning large language model developed by Anthropic, released in May 2025. It is optimized for speed, cost-efficiency, and agentic tasks, such as coding, computer use, and tool-based workflows. The model supports extended thinking mode for complex tasks and is designed for scalable, high-volume applications. Claude Sonnet 4 was trained on a proprietary mix of publicly available internet data (up to March 2025), private datasets, opted-in user data, and synthetic data. It underwent RLHF (Reinforcement Learning from Human Feedback) and Constitutional AI fine-tuning to align with principles like helpfulness, honesty, and harmlessness. The model is text-only and multilingual. Safety evaluations show strong alignment, with a 98.99% harmless response rate on violative requests and low over-refusal rates (0.23%) on benign prompts. It was deployed under AI Safety Level 2 (ASL-2) protections.
Weighted across four pillars · updated May 5, 2026
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