OpenAI has unveiled a cutting-edge image model, internally codenamed "mona-lisa-1," on the Arena platform. This model has been authenticated by netizens through its distinctive SynthID watermark, a telltale sign of OpenAI's craftsmanship. The images produced by this model are markedly more realistic, exhibiting a significant reduction in the artificial, plastic-like appearance that has plagued previous iterations. Moreover, they boast a wealth of intricate details, particularly excelling in the realm of artistic paintings and complex infographics.

Developers have speculated that the training for this model might have concluded last year, with its knowledge cutoff date aligning with that of GPT Image 2—both set at December 2025. This suggests that the new model could be perceived as a refined checkpoint within the same generative technology framework, or perhaps a "medium-sized" variant akin to GPT Image 2.5. Looking ahead, OpenAI is poised to introduce additional checkpoints, with the official version anticipated to push the boundaries of AI-generated image quality even further.