About Anthropic Claude
Where your AI bill really comes from.
Anthropic was founded in 2021 in San Francisco by Dario and Daniela Amodei together with five other former OpenAI staff, with Amazon and Google as strategic backers. About 2,500 people work on the product. The training approach is called Constitutional AI: the model is trained against an explicit set of written principles rather than only against human ratings.
The product is the Claude family of models, exposed through a REST API at api.anthropic.com. The line-up is Opus for the heavy reasoning, Sonnet for the daily workhorse and Haiku for the fast and cheap tier, with the 4.x generation as the current release. The endpoints that matter for a warehouse are the Messages API, the Message Batches API, the Models API, the Files and Skills APIs for agent workflows, and the Admin Usage Report at /v1/organizations/usage_report/messages, which returns uncached input tokens, cache-creation tokens, cache-read tokens, output tokens and service tier per workspace, per API key and per model in 1m, 1h or 1d buckets. That last endpoint is the one that turns Claude from a black-box invoice into something a finance and product team can attribute by feature.