OpenAI: GPT-5.3-Codex

GPT-5.3-Codex is OpenAI’s most advanced agentic coding model, combining the frontier software engineering performance of GPT-5.2-Codex with the broader reasoning and professional knowledge capabilities of GPT-5.2. It achieves state-of-the-art results...

• Context window: 400,000 tokens
• Input: text, image, file
• Output: text
• Pricing: $1.75/M input tokens, $14/M output tokens

View on OpenRouter. Model data sourced from OpenRouter.