AI ModelGPTbyOpenAIOpenAI's flagship large language model series.Latest version:5.3RumoredAll VersionsGPT 5.3RumoredRumored to be released on February, 2026Why 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").View details