Model releaseModerate global significanceConfirmed confidence
Anthropic releases Claude 4 Sonnet
The mid-size member of the Claude 4 family, striking a better balance between response speed and reasoning.
What happened
Event details
Claude 4 Sonnet is the mid-size member of the Claude 4 family, seeking a better balance between response speed and reasoning. Anthropic released the closed-source model on May 22, 2025; the parameter count is undisclosed and it is an autoregressive Transformer. The primary source is "Introducing Claude 4."
Assessment
Why it matters
Rated on the impact-v1 six-axis scale: technical 3/5, market 2/5, ecosystem 2/5, policy & social 1/5, scope 3/5, durability 3/5.
58/100Global significance score. Regional effects are recorded only when the evidence supports a meaningful difference.