Anthropic’s Claude Sonnet 4.5 is a 2025 update focused on long-duration autonomous work, stronger tool/computer use, tighter safety/alignment, and richer developer features (context editing, memory, in-chat code execution and file creation). Benchmarks and vendor tests emphasize large gains on coding and “agentic” tasks (e.g., Anthropic reports ~30 hours of continuous autonomous coding in internal tests and big jumps on OS/tool-use benchmarks).
Model Type: LLm