Anthropic

Anthropic is an American artificial intelligence company headquartered in San Francisco, focused on developing large language models under the Claude family. Founded with a strong emphasis on AI safety research, the company has become one of the most prominent labs in the frontier model space, producing systems recognized for their reasoning depth and instruction-following capabilities.

Anthropic contributes five text models to the catalog, spanning two performance tiers. The Opus line — Claude Opus 4.5, Claude Opus 4.6, and the latency-optimized Claude Opus 4.6 Fast — represents the flagship, high-capability tier released between late 2025 and early 2026. The Sonnet line, including Claude Sonnet 4.5 and Claude Sonnet 4.6, offers a more efficient alternative suited to everyday tasks while retaining strong general performance.

Anthropic distinguishes itself through its safety-first research orientation, investing heavily in interpretability and alignment techniques alongside capability advances. The Claude models are proprietary, and the tiered Opus/Sonnet structure gives users a clear choice between maximum intelligence and practical speed.