Cursor Composer 2 is just Kimi K2.5 with RL

twitter.com

March 20, 2026

1 min read

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61/100

Summary

Fynn discovered a model ID, "kimi-k2p5-rl-0317-s515-fast," while experimenting with the OpenAI base URL in Cursor. Composer 2 is identified as Kimi K2.5 with reinforcement learning (RL) capabilities.

Key Takeaways

The model ID for Composer 2 is identified as Kimi K2.5 with RL.
The OpenAI base URL was accessed to reveal information about the model.
There is a suggestion to rename the model ID for clarity.

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Coverage & discussions

Hacker News · twitter.com

Cursor Composer 2 is just Kimi K2.5 with RL ↗

Community discussions

Hacker News discussion ↗

Historical count: 5 · 5 saved in sample · Historical sample

Analysis ready

Community Sentiment

Mixed

Positives

Cursor's autocomplete model has garnered praise for its effectiveness, indicating a strong capability that resonates with users seeking reliable coding assistance.
The integration of Cursor with VSCode enhances its appeal, leveraging a popular IDE to attract a broader developer audience.

Concerns

Concerns about Cursor's reliance on repackaged open-source models suggest potential ethical and licensing issues, raising questions about the sustainability of their business model.
The perception that Cursor's competitive edge is thin, relying on existing models rather than developing proprietary technology, may undermine long-term viability in a rapidly evolving market.