OpenAI has released a new model, with some outlets referring to it as GPT-5.3-Codex and others as GPT-5.3-Codex-Spark or simply GPT-5.4, sparking some confusion over the exact name. The model is described as an advanced coding upgrade with agentic workflows for developers. Its capabilities and potential applications, including cybersecurity risks, are being reported, with some outlets noting its speed and performance on certain hardware.