Anthropic has released Claude Haiku 4.5, a latency-optimized model designed for workloads requiring tight latency budgets and high throughput, offering coding performance similar to Claude Sonnet 4 at a significantly lower cost.
The new model is priced at $1 per million input tokens and $5 per million output tokens, with prompt-caching rates set at $1.25 per million write tokens and $0.10 per million read tokens. Anthropic positions Haiku 4.5 as a cost-effective solution for applications such as real-time assistants, customer-support automations, and pair-programming, suggesting it as a drop-in replacement for Haiku 3.5 and Sonnet 4 in cost-sensitive, interactive workloads.
According to Anthropic, Haiku 4.5 runs more than twice as fast as Sonnet 4 while costing one-third as much. The company reports that Haiku 4.5 surpasses Sonnet 4 on “computer use” tasks involving GUI and browser manipulation, as seen in products like Claude for Chrome, and improves responsiveness in Claude Code for multi-agent projects and rapid prototyping.
Within Anthropic’s model lineup, Sonnet 4.5 remains the company’s frontier model, described as “the best coding model in the world.” Haiku 4.5 is positioned to offer near-frontier performance with greater cost-efficiency. Anthropic recommends an orchestration pattern where Sonnet 4.5 handles multi-step planning, with a pool of Haiku 4.5 workers managing parallelized execution.
Developers can access Haiku 4.5 on Anthropic’s API using the identifier claude-haiku-4-5. The model is also available on Amazon Bedrock and Google Cloud Vertex AI, although Anthropic notes that specific model catalog IDs and regional coverage may change over time.
Anthropic provided benchmark results to demonstrate Haiku 4.5’s capabilities, achieving a 73.3% score on SWE-bench Verified using a simple scaffold with bash and file edit tools. The company also shared results from Terminal-Bench and OSWorld-Verified, as well as performance measurements on AIME and MMMLU. These results show coding parity with Sonnet 4 and performance gains in computer-use tasks under specific testing scaffolds.
The company advises users to replicate tests with their own orchestration and tool stacks before generalizing performance. Haiku 4.5 is released under the ASL-2 license. In internal tests, Anthropic reports that Haiku 4.5 had a lower measured misalignment rate than both Sonnet 4.5 and Opus 4.1.
