Claude Haiku 4.5, our latest small model, is obtainable today to all users.
What was recently on 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 you similar levels of coding performance but at one-third the associated fee and greater than twice the speed.
Claude Haiku 4.5 even surpasses Claude Sonnet 4 at certain tasks, like using computers. These advances make applications like Claude for Chrome faster and more useful than ever before.
Users who depend on AI for real-time, low-latency tasks like chat assistants, customer support agents, or pair programming will appreciate Haiku 4.5’s combination of high intelligence and memorable speed. And users of Claude Code will find that Haiku 4.5 makes the coding experience—from multiple-agent projects to rapid prototyping—markedly more responsive.
Claude Sonnet 4.5, released two weeks ago, stays our frontier model and the perfect coding model on the earth. Claude Haiku 4.5 gives users a brand new option for once they want near-frontier performance with much greater cost-efficiency. It also opens up latest ways of using our models together. For instance, Sonnet 4.5 can break down a posh problem into multi-step plans, then orchestrate a team of multiple Haiku 4.5s to finish subtasks in parallel.
Claude Haiku 4.5 is obtainable in every single place today. In case you’re a developer, simply use claude-haiku-4-5 via the Claude API. Pricing is now $1/$5 per million input and output tokens.
Benchmarks
Claude Haiku 4.5 hit a sweet spot we didn’t think was possible: near-frontier coding quality with blazing speed and price efficiency. In Augment’s agentic coding evaluation, it achieves 90% of Sonnet 4.5’s performance, matching much larger models. We’re excited to supply it to our users.
Claude Haiku 4.5 is a breakthrough for agentic coding, particularly for sub-agent orchestration and computer use tasks. The responsiveness makes AI-assisted development in Warp feel instantaneous.
Historically models have sacrificed speed and price for quality. Claude Haiku 4.5 is blurring the lines on this trade off: it is a fast frontier model that keeps costs efficient and signals where this class of models is headed.
Claude Haiku 4.5 delivers intelligence without sacrificing speed, enabling us to construct AI applications that utilize each deep reasoning and real-time responsiveness.
Claude Haiku 4.5 is remarkably capable—just six months ago, this level of performance would have been state-of-the-art on our internal benchmarks. Now it runs as much as 4-5 times faster than Sonnet 4.5 at a fraction of the associated fee, unlocking a completely latest set of use cases.
Speed is the brand new frontier for AI agents operating in feedback loops. Haiku 4.5 proves you’ll be able to have each intelligence and rapid output. It handles complex workflows reliably, self-corrects in real-time, and maintains momentum without latency overhead. For many development tasks, it’s the best performance balance.
Claude Haiku 4.5 outperformed our current models on instruction-following for slide text generation, achieving 65% accuracy versus 44% from our premium tier model—that is a game-changer for our unit economics.
Our early testing shows that Claude Haiku 4.5 brings efficient code generation to GitHub Copilot with comparable quality to Sonnet 4 but at faster speed. Already we’re seeing it as a superb alternative for Copilot users who value speed and responsiveness of their AI-powered development workflows.
Safety evaluations
We ran an in depth series of safety and alignment evaluations on Claude Haiku 4.5. The model showed low rates of concerning behaviors, and was substantially more aligned than its predecessor, Claude Haiku 3.5. In our automated alignment assessment, Claude Haiku 4.5 also showed a statistically significantly lower overall rate of misaligned behaviors than each Claude Sonnet 4.5 and Claude Opus 4.1—making Claude Haiku 4.5, by this metric, our safest model yet.
Our safety testing also showed that Claude Haiku 4.5 poses only limited risks by way of the production of chemical, biological, radiological, and nuclear (CBRN) weapons. For that reason, we’ve released it under the AI Safety Level 2 (ASL-2) standard—in comparison with the more restrictive ASL-3 for Sonnet 4.5 and Opus 4.1. You may read the complete reasoning behind the model’s ASL-2 classification, in addition to details on all our other safety tests, within the Claude Haiku 4.5 system card.
Further information
Claude Haiku 4.5 is obtainable now on Claude Code and our apps. Its efficiency means you’ll be able to accomplish more inside your usage limits while maintaining premium model performance.
Developers can use Claude Haiku 4.5 on our API, Amazon Bedrock, and Google Cloud’s Vertex AI, where it serves as a drop-in alternative for each Haiku 3.5 and Sonnet 4 at our most economical price point.
For complete technical details and evaluation results, see our system card, model page, and documentation.
