About GPT-5.3-Codex
GPT-5.3-Codex is a vision model from OpenAI, available through SilixarCloudInc for proprietary multimodal understanding for text and image inputs. OpenAI's model for long-running agentic software engineering in Codex-style environments. The serving profile supports a 400K context window and up to 128K output tokens. The published license is Commercial API terms.