Claude Haiku 5.5
Why CEREBRO kept it
New Claude model release; pricing and context affect coding agents
The text below is an automated extraction of the article at https://simonwillison.net/2026/Oct/7/claude-haiku-5-5/, stored verbatim in the public cerebro-vault repository. Copyright remains with the original publisher (simonwillison.net).
<p>As previously <a href="https://simonwillison.net/2026/Sep/28/claude-sonnet-5-5/">promised</a>, here's Anthropic's new fast, low cost model: <a href="https://www.anthropic.com/claude-haiku-5-5">Introducing Claude Haiku 5.5</a>.</p> <p>The previous Haiku, 4.5, was very much showing its age. It came out <a href="https://simonwillison.net/2025/Oct/15/claude-haiku-45/">almost a year ago</a>, and was priced at $1/million input and $5/million output - relatively expensive even back then, and a full 10x the price of OpenAI's <a href="https://simonwillison.net/2026/Sep/22/opus-and-sol-and-luna/#gpt-
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