Anthropic Claude API

Anthropic did not formally announce or provide advance warning of the API change blocking third-party integrations. The change was only communicated through an employee's personal social media account after the fact, leaving subscribers unaware until they discovered broken integrations.

Claude API has different message formats, response structures, and required parameters compared to OpenAI, forcing developers to maintain separate integration logic. Unlike OpenAI where `max_tokens` is optional, Claude requires it, and response access patterns differ (`content[0].text` vs `choices[0].message.content`).

Claude's ecosystem is smaller than OpenAI's with fewer libraries, tools, and tutorials available. Developers must solve problems themselves that are well-documented for OpenAI.