Living definition
What is Claude Sonnet 5.5?
Foundation Models & LLMsAI & Agents
- Kind
- Model
- Released
- 2026-10-22
- Cohort
- model-001
Description
What it is and what it is for
AI-assisted draft · independently checked
A large language model is a computer program trained on a vast amount of text so that it can work with human language, for example by generating, summarizing, translating and analyzing it. Such models are the basis for many modern chatbots. Claude is a family of large language models developed by Anthropic, and Claude Sonnet 5.5 is one model in that family. Anthropic's documentation describes it as the best combination of speed and intelligence, and its announcement presents it for well-scoped everyday tasks, fixing bugs, and creating documents, slides and spreadsheets. Anthropic introduced it on September 28, 2026.
Written from primary sources and reference pages, and checked against them by an independent AI fact-checker. Drafted with AI assistance.
Primary sources
Where this description comes from
A plain-language summary that simplifies technical detail; it does not assess readiness, maturity or adoption.
Release record
Published description
Published on
- Cohort
- model-001
- Root
- sha256:c61dbbd5f64d5ec9e0219936a943311d34d95406a09965d8d58c10742e63b78b
- Entry
- sha256:dda5493986f4c952f4c4fb4c3342a5bc25c72a8dd24c97e63307e66c15f76e09