Fine-tuning on your proprietary data is the highest leverage thing you can do. Prompts get copied overnight. A model trained on your data, your evals, your edge cases is a strong moat. OpenAI is winding that path down. Don't give up the leverage. Bring the exact same OpenAI SFT JSONL to Fireworks. No conversion. Same messages, tool-calls, per message weight masking etc. Train on GPT-OSS, Kimi, Qwen etc. open weight models you can audit, serve, and own end to end. Your data → your model → your differentiated AI stack.

fine, I'll do it myself (*doesn't actually do anything himself, prompts V4-Pro in Hermes to do it*) *$0.16 and 4 million tokens later* wow that's really nice, now I'll have to double and triple check everything, thanks DeepSeek