CodexPlusPlus Alternatives (2026)
As of October 2026, the top alternatives to CodexPlusPlus are hermes-agent, siyuan, ai-engineering-from-scratch, marketingskills and CowAgent — ranked open-source General AI Agent agents on The Agentic Leaderboard.
Ranked by overall score on reliability, tool selection quality, autonomous iteration, efficiency, and community mindshare. Updated weekly.
| Rank | Alternative | Score | vs CodexPlusPlus |
|---|---|---|---|
| #27 | hermes-agent by NousResearch | 85.3 | +1.6 |
| #34 | siyuan by siyuan-note | 85.0 | +1.3 |
| #41 | ai-engineering-from-scratch by rohitg00 | 84.8 | +1.1 |
| #77 | marketingskills by coreyhaines31 | 83.9 | +0.2 |
| #94 | CowAgent by zhayujie | 83.5 | -0.2 |