Anthropic launched Claude Haiku 5.5 on Wednesday, the third model in its Claude 5.5 family in the past month, ahead of a planned IPO. The new small model targets lightweight, repetitive applications such as document summarization, data extraction, live customer support, and browser automation, and can also serve as a budget-friendly sub-agent alongside Sonnet 5.5 or Opus 5.5. Anthropic calls it the cheapest, fastest, and most capable small model it has released.

The headline number is price: for prompts under 100,000 tokens, which account for roughly 90% of historical Haiku workload, the rate drops to $0.10 per million input tokens and $0.50 per million output tokens — a 90% cut that exactly matches OpenAI's GPT-6 Luna. Above that threshold, pricing quintuples to $0.50/$2.50, still about half of Haiku 4.5. Anthropic says average running costs are around 75% below Haiku 4.5, factoring in an updated tokenizer.

Haiku 5.5 is also the first Haiku with an adjustable effort setting, letting developers dial compute up or down to trade cost against intelligence. It ships with a one-million-token context window and a first for the Haiku line: built-in safeguards for a narrow set of high-risk cybersecurity requests, without impacting most everyday tasks. The model is live now on the Claude Platform, AWS, Google Cloud, and Microsoft Azure under the model ID claude-haiku-5-5. With this launch, the 5.5 generation rollout that began with Opus 5.5 in September is complete.