What Claude 3.5 Sonnet does
The highest-intelligence model at practical speed — top scores on coding, reasoning, and vision benchmarks.
How Claude 3.5 Sonnet compares with its closest alternatives
2 of the 5 closest alternatives have a free plan, as Claude 3.5 Sonnet does. All 5 offer an API, as Claude 3.5 Sonnet does. Claude 3.5 Sonnet was founded in 2021; the alternatives were founded between 2023 and 2024. Claude 3.5 Sonnet is based in San Francisco, United States; 2 of the 3 alternatives with a known headquarters are in the United States too, and the others in France.