OpenAI's Codex to add new 'GPT-5.6 Sol Ultra' model, engineer says

A single post on X from an OpenAI staffer states that a model referred to as ‘GPT-5.6 Sol Ultra’ will be available in Codex, OpenAI’s AI coding tool. That one sentence is the entire content of the source — there are no accompanying details on capabilities, benchmarks, pricing, availability dates, or how the model differs from existing Codex options.

There is nothing here to corroborate or evaluate. The claim rests on a lone social-media message rather than an official product page, changelog, or documentation, and the unusual model name has not been confirmed through any primary OpenAI channel referenced in the source. Readers should treat it as an unverified teaser, not a substantiated release.

Until OpenAI publishes formal details, the only substantive takeaway is that a Codex model update may be coming. Any specifics about performance or features would be speculation beyond what the source actually says.