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...
openai/gpt-5.3-codexGPT-5.3-Codex is an API model from OpenAI, released on Feb 24, 2026, with a context window of 400,000 tokens, pricing of $1.75 per million input tokens and $14 per million output tokens. It accepts file, image, text input and produces text output.
At listed prices, a request with 10,000 input tokens and 1,000 output tokens costs about $0.032.
Specs are sourced from OpenRouter and were last checked on Nov 3, 2026. Always confirm current pricing and limits with the provider before production use.
GPT-5.3-Codex supports a context window of 400,000 tokens.
GPT-5.3-Codex is listed at $1.75 per million input tokens and $14 per million output tokens on OpenRouter.
GPT-5.3-Codex was published on Feb 24, 2026.
GPT-5.3-Codex accepts file, image, text input and produces text output.