Introducing Claude Haiku 4.5

Summary

Claude Haiku 4.5, the latest small model, is available to all users, offering a new option for near-frontier performance with lower cost and greater speed. Compared with Claude Sonnet 4, it delivers similar coding performance at one-third the cost and more than twice the speed, while surpassing Sonnet 4 on some computer-use tasks. Priced at $1/$5 per million input and output tokens, the model targets real-time assistants, customer service agents, pair programming, Claude Code workflows, and sub-agent orchestration, where Sonnet 4.5 can plan and delegate parallel subtasks to multiple Haiku 4.5 instances. Safety evaluations found low rates of concerning behavior and greater alignment than Haiku 3.5; the model is released under ASL-2 and is available through Claude apps and Code, the API, Amazon Bedrock, and Google Cloud’s Vertex AI.

Takeaways

1. 1

   Claude Haiku 4.5 costs $1 per million input tokens and $5 per million output tokens.

2. 2

   Sonnet 4.5 can break complex problems into multi-step plans and orchestrate multiple Haiku 4.5 instances to complete subtasks in parallel.

3. 3

   Safety evaluations found substantially greater alignment than Claude Haiku 3.5, and the model was released under the AI Safety Level 2 standard.