23-May-2025 :

Anthropic has launched the Claude 4 model family, including Claude 4 (the frontier model), Claude 4-Sonnet, and Claude 4-Haiku—marking a leap in language understanding, speed, and versatility. These models are available on Claude.ai and through the Anthropic API, with Claude 4-Sonnet now powering the Claude.ai platform by default.
Claude 4 offers significant improvements over Claude 2.1 in areas such as advanced reasoning, coding, and language translation. According to Anthropic, it demonstrates strong performance on graduate-level benchmarks like MMLU, GPQA, and HumanEval. It also supports 200K-token context windows, allowing deeper interaction across longer documents.
Claude 4-Sonnet balances cost-efficiency with high intelligence, ideal for enterprise applications, while Claude 4-Haiku is optimized for low latency, enabling near-instant responses for real-time tasks. These variants reflect Anthropic’s strategy to serve diverse use cases through a single AI architecture with differentiated performance tiers.
Multimodality is also a key upgrade. Claude 4 supports image inputs for document analysis, charts, and visual reasoning. This positions Anthropic closer to competitors like GPT-4, Gemini, and Mistral, with renewed emphasis on safe, controllable alignment.
Anthropic’s co-founders reiterated their commitment to Constitutional AI and robust safety evaluations, stating that the Claude 4 series integrates learnings from prior model behavior assessments and human feedback to improve both transparency and reliability across outputs.