AI Model
GPT 5.3
byOpenAI
Rumored to be released on February, 2026
Why it's rumored
References found in code / tooling and leaked "model IDs".
What to expect
Better cost/performance, context window leap (very large windows mentioned) and reliability improvements ("less hallucination").
Timeline
January 20, 2026
Codename 'Garlic' leaked
Internal codename and 400K context window specs surface in developer communities, suggesting a focus on efficiency over scale.
January 10, 2026
Model IDs found in tooling
References to GPT-5.3 model identifiers discovered in OpenAI's code and API tooling by external developers.
December 15, 2025
GPT-5.2 enterprise launch
Limited enterprise rollout of GPT-5.2, setting the stage for public 5.3 release speculation.