Anthropic unveiled Claude Haiku 4.5 on Wednesday, the latest version of its smallest AI model. The company says Haiku 4.5 offers performance similar to Sonnet 4 while running at more than twice the speed and costing one-third as much, according to a company blog post.
Benchmark results released by Anthropic support these claims. In testing, Haiku scored 73 percent on SWE-Bench verified and 41 percent on the command-line-focused Terminal-Bench. While slightly below Sonnet 4.5, these scores are comparable to Sonnet 4, GPT-5, and Gemini 2.5. Similar results were observed on benchmarks for tool use, computer tasks, and visual reasoning.
Haiku 4.5 will be available immediately on all free Anthropic plans. Its lightweight design makes it especially useful for free AI products, reducing server loads while allowing multiple Haiku agents to run in parallel or alongside more advanced models.
Anthropic Chief Product Officer Mike Krieger highlighted the model’s deployment potential. “It’s opening up entirely new categories of what’s possible with AI in production environments – with Sonnet handling complex planning while Haiku-powered sub-agents execute at speed,” he said. “We’re giving people a complete agent toolbox where each model has the right combination of intelligence, speed, and cost for different parts of the job.”
The model is expected to be particularly impactful in software development tools, where Claude Code is widely used and low latency is crucial. Zencoder CEO Andrew Filev described Haiku 4.5 as “unlocking an entirely new set of use cases.”
Haiku 4.5 follows several recent Anthropic launches. Sonnet 4.5 was released just two weeks ago, and Opus 4.1 launched two months earlier, both praised as state-of-the-art. The previous version of Haiku debuted in October 2024.
With Haiku 4.5, Anthropic aims to provide a flexible AI toolkit that balances speed, cost, and intelligence, expanding the possibilities for production-level applications.
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