by Anthropic
Claude Opus 4 is a frontier hybrid reasoning large language model developed by Anthropic, released in May 2025. It excels in reasoning, visual analysis, computer use, and tool use, with advanced capabilities in software engineering and agentic tasks. The model supports extended thinking mode for complex problem-solving and is designed for high-stakes, high-impact applications. Claude Opus 4 was trained on the same proprietary mix of data as Claude Sonnet 4 (public internet data up to March 2025, private datasets, opted-in user data, and synthetic data). It underwent RLHF and Constitutional AI fine-tuning to align with helpfulness, honesty, and harmlessness. The model is text-only and multilingual. Safety evaluations show strong alignment, with a 98.43% harmless response rate on violative requests (improving to 98.76% with ASL-3 safeguards) and low over-refusal rates (0.07%) on benign prompts. It was deployed under AI Safety Level 3 (ASL-3) protections due to its advanced capabilities.
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