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I'm not fully clear on this. Is this a quant trading benchmark for LLMs or a RL env?

It is both. We can use the same setup for both RL and Benchmarking.

Is it STRICTLY for LLMs & quant research or does it do generic trading simulation?

It is not only quant research. We also have live trading: https://edotenv.com/blog/long-horizon-planning

For now it is only facing LLM/Agent.