Claude Haiku 4.5 matches Claude Sonnet 4's performance on coding, computer use, and agent tasks at substantially lower cost and faster speeds, making it a high-capability model in the Haiku line for high-throughput agentic deployments.
import { streamText } from 'ai'
const result = streamText({ model: 'anthropic/claude-haiku-4.5', prompt: 'Why is the sky blue?'})Claude Haiku 4.5 became available on Vercel AI Gateway on October 15, 2025. It matches Sonnet 4's performance on coding, computer use, and agent tasks at substantially lower cost and faster speeds. Earlier Haiku generations told a similar story relative to their era's highest-tier release; Haiku 4.5 applies it to the Claude 4 generation.
Workloads that previously required a Sonnet 4 deployment can now be evaluated against Haiku 4.5. For organizations running large agent fleets or high-frequency pipelines, the cost differential between Haiku and Sonnet tiers compounds significantly at scale.
Access the model by setting the model string to anthropic/claude-haiku-4.5 in the AI SDK, Chat Completions API, Responses API, Messages API, or other API formats. Through AI Gateway, you get built-in observability for tracking usage and cost, bring-your-own-key support, and intelligent provider routing across anthropic, bedrock, vertexAnthropic.
Haiku 4.5 inherits the Claude 4 generation's improvements in agentic task execution and instruction following. For teams building with the AI SDK v5, the integration requires only the model string update. No other code changes are needed for the common case.