Anthropic launches Claude Haiku 5.5, cutting prices up to 90% from Haiku 4.5

Anthropic released Claude Haiku 5.5 on October 7, calling it the cheapest, fastest and most capable small model it has ever released.

It is built for high-volume, cost-sensitive work. Anthropic says Haiku 5.5 handles quick, repetitive workloads such as summaries, compactions, database queries and classification, and pairs with Opus 5.5 and Sonnet 5.5 as a subagent on coding work. As Anthropic's fastest model to date at standard speed, it also targets speed-sensitive tasks like live customer support and browser use. It is the first Haiku model with an adjustable effort setting.

Prices drop by up to 90%. For prompts up to 100,000 tokens, Haiku 5.5 costs $0.10 per million input tokens and $0.50 per million output tokens, versus $1 and $5 for Haiku 4.5. Above 100,000 tokens, it costs $0.50 and $2.50, half of Haiku 4.5's price. Anthropic says about 90% of requests to Haiku 4.5 fell under the 100,000-token line, and that Haiku 5.5 costs around 75% less to run on average, after accounting for an updated tokenizer that uses slightly more tokens per task.

Benchmarks jump over Haiku 4.5. In Anthropic's results, Haiku 5.5 scores 1620 on GDPval-AA v2.1 versus 735 for Haiku 4.5, and 72.4% on the offline subset of OSWorld 2.1 versus 15.7%. On Humanity's Last Exam it scores 45.9% without tools and 57.4% with tools, up from 10.2% and 18.7%. Anthropic says Sonnet 5.5 and Opus 5.5 remain better choices for complex agentic coding; Haiku 5.5 scores 39.2% on Terminal-Bench 4.0 versus 70.6% for Sonnet 5.5.

Sonnet gets cheaper too. Anthropic halved Sonnet 5.5's cache-read price to $0.10 per million tokens, which it says makes Sonnet 5.5 about 20% cheaper on most agentic work. This week it is also rolling out monthly API credits for Max and Team subscribers: $100 for Max 5x, $200 for Max 20x, and up to $500 pooled for Team plans. Its Python and TypeScript SDKs add beta support for computer use and browser use.

Availability. Haiku 5.5 is available now on the Claude Platform as claude-haiku-5-5 and on Amazon Web Services, Google Cloud and Microsoft Azure.