Claude 3.5 Sonnet
*Anthropic mid-2024 workhorse tuned for coding and long-context tasks at competitive latency.*
Shipped by Anthropic · · class: frontier-llm
Anthropic marketed Claude 3.5 Sonnet as outperforming the prior Opus class on many interactive workloads while costing less—an explicit bet that mid-size models plus better alignment and data win product markets. Release materials highlighted coding benchmarks; developer uptake became visible quickly in IDE integrations.
Post-release, the empirical pattern was robust everyday utility with periodic safety and policy critiques typical of broadly deployed models. Comparative rankings fluctuated with Gemini and GPT updates; Sonnet’s significance is less “winner forever” than proof that Anthropic could ship iterate-and-replace cadence competitive with larger labs.