Claude Sonnet 4.6 vs Claude Haiku 4.5
Sonnet for complex tasks requiring reasoning; Haiku for high-volume, latency-sensitive work.
Claude Sonnet 4.6
The workhorse. Faster than Opus, smarter than Haiku, the model most production deployments end up on.
Use this when
Complex reasoning, JSON schemas, tool use with planning.
Full profile →Claude Haiku 4.5
The fast one. Used for sub-agents, high-volume classification, and the parts of an agent loop where capability matters less than throughput.
Use this when
High-volume classification, sub-agent routing, cost-critical workloads.
Full profile →Cost comparison
Sonnet $3/$15 per M; Haiku $1/$5 per M. Haiku 3× cheaper.