Anthropic launches Claude Sonnet 5 AI model with coding, safety upgrades
Anthropic PBC today debuted Claude Sonnet 5, a midrange large language model that outperforms its predecessor in several areas.
The LLM will be the default option in the consumer tiers of the company’s Claude chatbot service.
Anthropic’s commercially available LLMs are organized into three product families: the entry-level Haiku series, Sonnet and the high-end Opus lineup. In April, the company debuted two LLMs called Mythos 5 and Fable 5 that are even more capable than Opus. However, they’re not yet broadly accessible.
Anthropic measured Sonnet 5’s coding capabilities using two benchmarks called SWE-Bench Pro and Terminal-Bench 2.1. The model improved upon the scores of its predecessor by 5.1% and 13.4%, respectively. GPT-5.6 Terra, OpenAI Group PBC’s competing midrange LLM, outperformed Sonnet 5 on Terminal-Bench 2.1 by about 4%.
