overview changedapi/overview
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2424The Claude API includes the following APIs:
2525
26**General Availability:**
27
2826* **[Messages API](https://platform.claude.com/docs/en/api/messages/create)**: Send messages to Claude for conversational interactions (`POST /v1/messages`)
2927* **[Message Batches API](https://platform.claude.com/docs/en/api/messages/batches/create)**: Process large volumes of Messages requests asynchronously with 50% cost reduction (`POST /v1/messages/batches`)
3028* **[Token Counting API](https://platform.claude.com/docs/en/api/messages-count-tokens)**: Count tokens in a message before sending to manage costs and rate limits (`POST /v1/messages/count_tokens`)
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3230* **[Files API](https://platform.claude.com/docs/en/api/files/upload)**: Upload and manage files for use across multiple API calls (`POST /v1/files`, `GET /v1/files`)
3331* **[Skills API](https://platform.claude.com/docs/en/api/skills/create)**: Create and manage custom agent skills (`POST /v1/skills`, `GET /v1/skills`)
3432
35**Beta:**
33The following APIs are in beta:
3634
3735* **[Agents API](https://platform.claude.com/docs/en/managed-agents/agent-setup)**: Define reusable, versioned agent configurations for Claude Managed Agents (`POST /v1/agents`, `GET /v1/agents`)
3836* **[Sessions API](https://platform.claude.com/docs/en/managed-agents/sessions)**: Run stateful agent sessions in managed cloud sandboxes (`POST /v1/sessions`, `GET /v1/sessions/{id}/events/stream`)
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