GPT-5.6 Leaked: OpenAI's New AI Model Surfaces in Codex

OpenAI's next-generation model, GPT-5.6, has reportedly been exposed in application code. This discovery sparked intense interest among markets and developer communities. Users found identifiers for three sub-models: Sol, Terra, and Luna, within the Codex application's underlying code. A new "speed dial" feature was also revealed, suggesting users can adjust between inference speed and answer quality. Leaks indicate OpenAI has an internal launch target of July 7–9 for GPT-5.6. This timing aligns with the expiration of a quota plan for Anthropic's Claude Fable 5. Anthropic has faced criticism over commercial decisions, and Google's Gemini 3.5 Pro recently underwent an emergency overhaul. The code also hints at "Sol Ultra," which industry insiders believe could be a competitor to Anthropic's Fable 5, potentially offering similar performance at a more accessible price. However, real-time voice support for GPT-5.6 is still under development and may not be ready for the upcoming launch. This development could significantly impact the competitive landscape of high-end AI models.