What is Claude Haiku 5.5 and what are its key features?

Claude Haiku 5.5 is Anthropic's newest small language model, released on October 7, 2026. It is positioned as their cheapest, fastest, and most capable small model, specifically designed for high-volume, cost-sensitive tasks. Key features include significantly reduced pricing, improved performance across various benchmarks, and an adjustable 'effort' setting that allows users to balance cost and intelligence.

How much cheaper is Claude Haiku 5.5 compared to previous versions or other models?

Claude Haiku 5.5 is, on average, about 75% less expensive to run than its predecessor, Haiku 4.5. For prompts up to 100,000 tokens, the price reduction can be as substantial as 90% compared to Haiku 4.5, making its pricing competitive with or even superior to other budget models like OpenAI's GPT-6 Luna.

What are the primary use cases for Claude Haiku 5.5?

Claude Haiku 5.5 is optimized for high-volume, repetitive, and cost-sensitive tasks. Common applications include summarization, classification, data extraction, database queries, powering live customer support chatbots, browser use, and serving as a fast and affordable sub-agent in more complex AI workflows alongside models like Opus 5.5.

Does Claude Haiku 5.5 truly outperform more expensive models, and what are its limitations?

Benchmarks indicate that Claude Haiku 5.5 shows significant performance improvements over Haiku 4.5 and can surpass OpenAI's budget model, GPT-6 Luna, in areas such as agentic coding and knowledge work. However, its most cost-effective rates apply to prompts under 100,000 tokens, and for tasks requiring deeper reasoning or extensive professional work, larger models like Sonnet 5.5 or Opus 5.5 are generally recommended.

Claude Haiku 5.5 Just Beat Models 10x Its Price. Nobody Saw This Coming.

By Marcus Webb · October 08, 2026 · 7 min read

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Claude Haiku 5.5 is the small, low-cost model in Anthropic's current Claude 5 family, which also includes Fable 5.1, Opus 5.5 and Sonnet 5.5. Its model ID is claude-haiku-5-5.

The headline claim is that Haiku 5.5 outperforms models that cost roughly ten times as much.

Anthropic's announcement is the place to check the exact benchmark results, the pricing and the named competitor models behind that comparison.

For teams choosing a model, the practical question is whether a small, inexpensive model can handle a given workload as well as a flagship one.

Haiku 5.5 is worth testing against Opus 5.5 and Sonnet 5.5 on your own tasks before you commit to the more expensive tier.

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Claude Haiku 5.5 Just Beat Models 10x Its Price. Nobody Saw This Coming.

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