OpenAI API Leak Reveals Unannounced GPT Image 2.6 Model
An accidental update to OpenAI’s public API specification on October 29, 2026, appears to have revealed an unannounced next-generation image model: GPT Image 2.6. Newly published endpoint definitions reference the unreleased model alongside a new “markup” image-editing feature.
According to the API documentation, the markup parameter introduces vector-based masking for localized inpainting and outpainting. This technique enables precise, region-specific edits to AI-generated images through structured API calls.
The specification states that the feature “supports GPT Image 2.5 and 2.6,” indicating compatibility with both versions. The listing may suggest a public launch is approaching, though OpenAI has not made an official announcement.
Analysts and developers who spotted the leak expect GPT Image 2.6 to address persistent challenges in AI image generation, including:
- Text-rendering accuracy within images
- Complex hand geometry
- Spatial consistency across multiple objects
The appearance of both GPT Image 2.5 and 2.6 in the same endpoint definition may indicate that OpenAI is nearing launch. However, the company has not confirmed the model or its release timeline.