Onyx vs Open Assistant API

Side-by-side comparison of two AI agent tools

Short answer

  • Open Assistant API has had no commit in 21 months; Onyx is actively maintained (1,557 commits in the last 90 days).
  • Onyx is growing faster: +240 GitHub stars in the last 30 days vs +1 for Open Assistant API.
  • Pick Onyx for: open Source AI Platform - AI Chat with advanced features that works with every LLM. Pick Open Assistant API for: open-source, self-hosted AI assistant API compatible with OpenAI and supporting LLMs, RAG, and tools.

From GitHub data refreshed daily.

O
Onyxopen-source

Open Source AI Platform - AI Chat with advanced features that works with every LLM

Open-source, self-hosted AI assistant API compatible with OpenAI and supporting LLMs, RAG, and tools

Metrics

OnyxOpen Assistant API
Stars32.3k367
Star velocity /mo2401.2698412698412698
Commits (90d)1.6k0
Releases (6m)100
Overall score0.81026107127977030.16821735975036525

Pros

    • +开源自托管，提供完全的数据控制和隐私保护
    • +通过 One API 集成支持更多 LLM 模型，不局限于 GPT
    • +内置互联网搜索功能和 R2R RAG 引擎支持

    Cons

      • -代码解释器功能仍在开发中，不如 OpenAI 成熟
      • -需要自行部署和维护，增加运维成本
      • -需要一定的技术专业知识进行配置和部署

      Use Cases

        • •构建需要多种 LLM 模型支持的 AI 应用程序
        • •开发需要互联网搜索能力的智能助手
        • •企业级自托管 AI 助手解决方案部署
        View Onyx DetailsView Open Assistant API Details

        FAQ

        Which is more popular, Onyx or Open Assistant API?
        Onyx has more GitHub stars (32,316 vs 367).
        Which is more actively developed, Onyx or Open Assistant API?
        Onyx had more commits in the last 90 days (1,557 vs 0).
        Should I use Onyx or Open Assistant API?
        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.
        Onyx vs Open Assistant API (2026): GitHub Stats, Features & Which to Choose