AI labs want to use AI to speed up their own AI development. OpenAI says the new GPT-5.6 Sol model does this better than anything before it.

OpenAI's new flagship model, GPT-5.6 Sol, independently post-trained the smaller model Luna, according to the company. After Luna's initial pre-training, Sol optimized it for specific skills and behaviors on its own.

A researcher gave Sol a "fairly under-specified prompt" through the Codex platform. The instructions told the model to find the right training configurations, pick suitable GPUs, launch the training script, and verify everything was running correctly.

The partially redacted prompt a researcher used to instruct GPT-5.6 Sol to post-train Luna. The instructions cover training configs, GPU selection, launching scripts, and verifying the run. | Image: OpenAI

"Previously this is something that a team of senior researchers may have worked on at OpenAI, and now it really feels like the automated researcher is pretty close," OpenAI researcher Kathy Shi said during the presentation.