Anthropic Offers Claude Haiku 4.5, a Smaller, Faster, and Cheaper AI Model

Anthropic is releasing Claude Haiku 4.5, its latest small model, to all users—boasting that “what was recently at the frontier is now cheaper and faster.”

Five months ago, Claude Sonnet 4 was a state-of-the-art model. Today, Claude Haiku 4.5 gives users similar levels of coding performance but at one-third the cost and more than twice the speed, according to Anthropic.

Claude Haiku 4.5 even surpasses Claude Sonnet 4 at certain tasks, including using computers, making applications such as Claude for Chrome faster and more useful than ever before.

Claude Haiku 4.5 gives users a new option for when they want near-frontier performance with much greater cost-efficiency. It also opens new ways of using our models together, the company said.

Anthropic also ran a detailed series of safety and alignment evaluations on Claude Haiku 4.5. and the model showed low rates of concerning behaviors, and was substantially more aligned than its predecessor, Claude Haiku 3.5.

In its automated alignment assessment, Claude Haiku 4.5 also showed a statistically significantly lower overall rate of misaligned behaviors than both Claude Sonnet 4.5 and Claude Opus 4.1—making Claude Haiku 4.5, by this metric, Anthropic’s safest model yet, the company said.

Developers can use Claude Haiku 4.5 on Anthropic API, Amazon Bedrock, and Google Cloud’s Vertex AI, where it serves as a drop-in replacement for both Haiku 3.5 and Sonnet 4 at its most economical price point.

Claude Haiku 4.5 is available everywhere now. Developers can use claude-haiku-4-5 via the Claude API. Pricing is now $1/$5 per million input and output tokens.

For more information about this news, visit www.anthropic.com.