A comprehensive comparison of two leading frameworks for building AI agents, released within days of each other in fall 2025
Last Updated: October 12, 2025 | Both frameworks are newly released and actively evolving. Check official documentation for the latest features.
In October 2025, AI agent development reached an inflection point. OpenAI launched AgentKit on October 6, and just days earlier, on September 29, Anthropic released the Claude Agent SDK alongside Claude Sonnet 4.5. Both represent mature, production-ready approaches to building AI agents, but with fundamentally different philosophies.
Which framework fits your needs? This guide provides a detailed, objective comparison to help you evaluate both options.
mindmap
root((AI Agent Frameworks))
OpenAI AgentKit
Visual Development
Agent Builder
ChatKit UI
Drag-and-Drop
Managed Infrastructure
OpenAI Hosting
Auto-Scaling
Built-in Safety
Quick Setup
Tool Registry
Pre-built Connectors
Integrated Testing
Claude Agent SDK
Developer Control
Local Execution
Custom Tools
MCP Protocol
Flexible Deployment
On-Premises
Amazon Bedrock
GCP Vertex AI
Production Proven
Claude Code Legacy
Battle-Tested
Enterprise Ready
Key Differences
Maturity
AgentKit: New Oct 2025
Claude: Evolved from Claude Code
Philosophy
AgentKit: Managed Speed
Claude: Developer Autonomy
Deployment
AgentKit: OpenAI Only
Claude: Multi-Cloud
This mindmap shows the core distinctions between the two frameworks. AgentKit prioritizes speed with managed infrastructure, while Claude Agent SDK emphasizes developer control with flexible deployment options.
This section explores what each framework offers and how they approach agent development differently.
AgentKit is OpenAI's comprehensive platform for building AI agents, featuring:
The platform runs on OpenAI's managed infrastructure, making it product-ready out of the box.
The Claude Agent SDK (formerly Claude Code SDK) is Anthropic's developer-first framework providing: