Anthropic's Claude Haiku 5.5 appears live in model selector alongside Opus 5.5 and Sonnet 5.5

Key facts

• @AndrewCurran_ reported on Oct 7, 2026 that Haiku 5.5 was live for him.
• A screenshot posted by @AndrewCurran_ shows a model selector listing three options: Opus 5.5, Sonnet 5.5, and Haiku 5.5, with Haiku 5.5 shown as selected.
• The selector describes Opus 5.5 as for complex work and everyday tasks, Sonnet 5.5 as most efficient for simpler tasks, and Haiku 5.5 as fastest for quick answers.
• Anthropic is identified as the vendor of the newly live Haiku 5.5 model per a 9to5Mac report by Zac Hall shared via @9to5mac and an @MTSlive post linking to the announcement.
• An attached benchmark table shows Haiku 5.5 scoring 1620 on GDPval-AA v2.1, versus 735 for Haiku 4.5 and 1437 for GPT-6 Luna, with Sonnet 5.5 listed at 1840.
• The table shows Haiku 5.5 at 72.4% on OSWorld 2.1 computer use (offline subset), versus 15.7% for Haiku 4.5 and 48.9% for GPT-6 Luna.
• The table shows Haiku 5.5 at 39.2% on Terminal-Bench 4.0 agentic coding, versus 0.0% for Haiku 4.5 and 16.4% for GPT-6 Luna.
• The table shows Haiku 5.5 at 45.9% without tools and 57.4% with tools on Humanity's Last Exam, and 46.4% on FrontierCode 1.1 (Main) agentic coding.
• The table shows Haiku 5.5 at 46.4% on Chartography visual reasoning without tools, versus 6.4% for Haiku 4.5 and 29.1% for GPT-6 Luna.
• The report of Haiku 5.5 being live is based on a single user's screenshot.
• Anthropic is the vendor of the newly live Haiku 5.5 model, per a 9to5Mac report by Zac Hall shared via @9to5mac and an @MTSlive post linking to the announcement.