While we're constantly updating Claude's data, each model has a knowledge cutoff:
Claude 3 Opus was trained on data up until August 2023
Claude 3 Haiku was trained on data up until August 2023
Claude 3.5 Sonnet was trained on data up until April 2024
Claude 3.5 Haiku was trained on data up until July 2024
Claude 3.7 Sonnet was trained on data up until November 2024
Claude 4 Sonnet was trained on data up until March 2025
Claude 4 Opus was trained on data up until March 2025
These models may not be aware of events or information that occurred after their respective cutoff dates. If you ask about more recent events, the model may not have accurate information.