NanoRL
RL training for LLMs in ~1,800 lines
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What is NanoRL?
NanoRL is RL training for LLMs in ~1,800 lines It's designed for learners and researchers wanting a readable rl loop.
About NanoRL
Key Strengths
- RL training for LLMs in about 1,800 lines
- One loop from CartPole on a laptop to async RLVR on a GPU cluster
- No Ray, TRL or DeepSpeed
Limitations to Consider
- Educational scale
- Needs GPUs for real use
- Young
Best For
Learners and researchers wanting a readable RL loop.
Skip it if: You need a production trainer.
Pricing
flexible pricing options
Free and open source (checked Oct 14, 2026)
Sources
Pros, cons and pricing compiled from public sources (official pricing/docs pages, published reviews, user reports), not hands-on testing.
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What is NanoRL?
NanoRL is RL training for LLMs in ~1,800 lines It's designed for learners and researchers wanting a readable rl loop.
How much does NanoRL cost?
NanoRL offers flexible pricing options You can check pricing on their official website.
Who should use NanoRL?
NanoRL is best suited to learners and researchers wanting a readable rl loop.