Migrate from OpenAI to Anthropic Overview Migrate from OpenAI/GPT to Anthropic/Claude. Covers the complete API mapping (endpoints, models, response shapes), SDK swap with before/after code, five key differences (max tokens required, system as top-level param, alternating messages, response path, streaming events), and tool use migration. API Mapping | OpenAI | Anthropic | Notes | |--------|-----------|-------| | | | Different request/response shape | | | | Different model IDs | | | | Different response path | | in messages array | as separate parameter | Claude uses top-level | | | System pro…