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Anthropic rolls out second Claude 5.5 model as it builds toward IPO

By Thomson Reuters Sep 28, 2026 | 1:02 PM

Sept 28 (Reuters) – Anthropic on Monday released Claude Sonnet 5.5, the second model in its Claude 5.5 family, as ​the AI lab expands its ‌product lineup ahead of a planned IPO.

Here are some more details:

• Sonnet 5.5 is priced at $2 per million input tokens and $10 per million output ‌tokens, ​unchanged from its predecessor, ⁠Sonnet 5. Anthropic said ⁠the model needs fewer tokens to complete the same work.

• The company said Sonnet 5.5 is a faster, lower-cost complement ​to Claude Opus 5.5, which it launched last week at $4 per million input ⁠tokens and $20 per million ⁠output tokens.

• The model is the ​company’s second launch amid growing debate over ​AI risks. Chief executive Dario Amodei earlier this ‌month called on the global AI community to slow down the pace of releasing new capabilities to address safety concerns.

• ⁠The company said enterprise customers account for about 80% of its business, with clients including Salesforce, Databricks, ⁠Goldman Sachs ‌and Novo Nordisk.

• Anthropic said ⁠the model is suited to ​everyday ‌enterprise tasks such as coding, document ​creation and ⁠spreadsheet work.

• A third model, Haiku 5.5, designed for fast, high-volume work, is due soon.

(Reporting by Anhata Rooprai in Bengaluru and Jeffrey Dastin in San Francisco; Editing by ​Tasim Zahid)