OpenAI Assistants API
Managed agent platform with tools, files, and persistent threads — deprecated in favour of the Responses API
Verdict
OpenAI has deprecated this in favour of the Responses API and set a sunset timeline. Built-in code interpreter, file search, and persistent threads were genuinely useful, but do not start new projects here — migrate existing integrations to the Responses API.
Other AI Agents & Platforms
- OpenAI Responses APIProduction
OpenAI's current API for building agents — merges Chat Completions simplicity with Assistants-era tool use
- Claude MCP / Tool UseProduction
Anthropic's Model Context Protocol for universal tool integration
- Microsoft Copilot StudioProduction
Enterprise agent builder with Microsoft 365 and Azure integration
- AutoGenStable
Microsoft's multi-agent conversation framework
- CrewAIStable
Role-based multi-agent framework with simple, intuitive API
- LangGraphStable
Stateful agent workflows as controllable graphs from LangChain