Introducing Claude Haiku 5.5: the cheapest, fastest, and most...
Claude@claudeai
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Oct 08, 2026
~1 min read
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Introducing Claude Haiku 5.5: the cheapest, fastest, and most capable small model we’ve ever released.
On average, it costs around 75% less to run than Claude Haiku 4.5.
On average, it costs around 75% less to run than Claude Haiku 4.5.
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Haiku 5.5 is a significant step up over Haiku 4.5 across coding, computer use, and knowledge work.
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Haiku 5.5 is designed for high-volume, cost-sensitive tasks. It reliably handles repetitive work like summaries and classification, and pairs well with Claude Opus 5.5 and Sonnet 5.5 as a subagent on coding work.
It’s also fast enough for live customer support and browser use.
It’s also fast enough for live customer support and browser use.
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Haiku 5.5 is our first Haiku model with an adjustable effort setting, so you can decide whether to optimize for cost or intelligence on each task.
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Haiku 5.5 is especially good value on tasks under 100,000 tokens, which make up around 90% of requests to our previous Haiku model.
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Haiku 5.5 shows major improvements across almost all of our alignment evaluations relative to Haiku 4.5, with far fewer instances of misaligned behavior.
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Haiku 5.5 is available now on all platforms, including Amazon Web Services, Google Cloud, and Microsoft Azure.
Read more: anthropic.com/claude-haiku-5…
Read more: anthropic.com/claude-haiku-5…
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One more thing: we’re halving the price of cache reads on Claude Sonnet 5.5, to $0.10 per million tokens. That makes Sonnet 5.5 around 20% cheaper to run on most long-running work.
