Claude Sonnet 5

Claude Sonnet 5 is Anthropic's mid-tier model balancing speed and capability, with a 1M token context window.

Strengths

Sonnet 5 handles general-purpose tasks efficiently and maintains the speed advantage of the Sonnet tier while improving reasoning and coding ability over prior Sonnet releases.

Best for

Applications requiring a mix of speed and intelligence — content generation, customer support, code assistance, and moderate reasoning tasks where latency matters.

Limitations

Not designed for the hardest reasoning problems or extended agentic work; for those use cases, Opus or Fable tiers offer substantially greater capability.