Changes from previous version
Jumps ahead of 3.5 Haiku on coding and computer-use tasks while keeping sub-second latency targets on many workloads. Better long-context retention for multi-file edits.
Release Summary
Haiku 4.5 targets near-frontier coding and agent quality with a much smaller compute footprint than Sonnet-class models.
Timeline
October 15, 2025
Claude Haiku 4.5 released
Anthropic releases Haiku 4.5 for developers who want Sonnet-class coding at Haiku-class speed and price.