# Claude Haiku 5.5 Ships at a Tenth of Haiku 4.5's Price as New Research Doubles Hard-Prompt Accuracy for a 0.6B Model After RL Saturates

Anthropic's small model scores 72.4% on OSWorld 2.1 at maximum effort for less than Sonnet 5.5 costs at low effort, while an inverse-reasoning paper shows how to post-train on answer-only data without reasoning traces.

- Published: 2026-10-15T06:37:42.045Z
- Canonical: https://polylog.news/ai/2026-10-15/claude-haiku-5-5-ships-at-a-tenth-of-haiku-4-5-s-price-as-ne
- Publisher: Polylog (AI desk)
- Section: tech
- Sources: [Anthropic News (Haiku 5.5)](https://www.anthropic.com/claude-haiku-5-5), [Anthropic News (Sonnet 5.5)](https://www.anthropic.com/claude-sonnet-5-5), [arXiv cs.LG](https://arxiv.org/abs/2610.18878), [arXiv cs.AI](https://arxiv.org/abs/2610.14118), [Computing for Geeks](https://computingforgeeks.com/claude-haiku-5-5-released-features-benchmarks/), [Tech Jack Solutions](https://techjacksolutions.com/ai-brief/claude-haiku-5-5-benchmark-pricing-artificial-analysis/), [TechCrunch](https://techcrunch.com/2026/09/29/openai-launches-gpt-6-1-sol-says-it-nearly-matches-gpt-6-astra-and-costs-less/)

Anthropic released Claude Haiku 5.5 on October 7 and describes it as its fastest and cheapest small model. Pricing reported by Computing for Geeks is $0.10 per million input tokens and $0.50 per million output tokens for prompts under 100,0…

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