I actually just benchmarked Llama3 70B coding with aider, and it did quite well. It scored similar to GPT 3.5.
You can use Llama3 70B with aider via Ollama [0]. It's also available for free via Groq [1] (with rate limits). And OpenRouter has it available [2] for low cost on their paid api.
[0] https://aider.chat/docs/llms.html#ollama