A2A vs OpenAI Developers Responses API reference
Side-by-side comparison of two AI agent tools
Short answer
- A2A is growing faster: +494 GitHub stars in the last 30 days vs +31 for OpenAI Developers Responses API reference.
- Pick A2A for: agent2Agent (A2A) is an open protocol enabling communication and interoperability between opaque agentic. Pick OpenAI Developers Responses API reference for: openAPI specification for the OpenAI API.
From GitHub data refreshed daily.
A2Aopen-source
Agent2Agent (A2A) is an open protocol enabling communication and interoperability between opaque agentic applications.
OpenAI Developers Responses API referenceopen-source
OpenAPI specification for the OpenAI API
Metrics
| A2A | OpenAI Developers Responses API reference | |
|---|---|---|
| Stars | 26.0k | 2.5k |
| Star velocity /mo | 494.2105263157895 | 30.789473684210527 |
| Commits (90d) | 58 | 190 |
| Releases (6m) | 1 | 0 |
| Overall score | 0.6569609048843527 | 0.5100556306685324 |
Pros
- +Standardized protocol enabling interoperability between different agentic systems regardless of implementation
- +Strong community adoption with 22,866 GitHub stars and comprehensive multi-language documentation support
- +Open source with Apache 2.0 license and Python SDK available on PyPI for easy integration
- +官方维护的权威API规范，确保文档的准确性和时效性
- +提供自动更新和手动维护两个版本，满足不同使用场景的需求
- +标准OpenAPI格式支持自动生成客户端代码和API文档
Cons
- -May require significant refactoring of existing agent systems to adopt the protocol
- -Potential performance overhead when routing communications through the protocol layer
- -作为规范文档而非可执行工具，需要配合其他工具才能发挥价值
- -手动维护版本可能存在更新滞后的问题
- -对于初学者来说，直接阅读OpenAPI规范可能存在一定的技术门槛
Use Cases
- •Multi-agent systems where specialized agents need to coordinate and share information across different platforms
- •Enterprise environments with various AI tools that need to communicate and collaborate on complex workflows
- •Distributed agent networks where agents from different organizations or vendors must interoperate
- •使用OpenAPI生成工具自动创建各种编程语言的OpenAI API客户端库
- •在API开发工具中导入规范以进行接口测试和调试
- •基于规范文档构建自定义的API集成工具和中间件服务
FAQ
- Which is more popular, A2A or OpenAI Developers Responses API reference?
- A2A has more GitHub stars (25,996 vs 2,541).
- Which is more actively developed, A2A or OpenAI Developers Responses API reference?
- OpenAI Developers Responses API reference had more commits in the last 90 days (190 vs 58).
- Should I use A2A or OpenAI Developers Responses API reference?
- Compare their capabilities, limitations and "best for" notes above. Both are open source, so trying each on a small task is the fastest way to decide.