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...
Specifications
| Provider | OpenAI |
|---|---|
| Context window | 400,000 tokens (400K) |
| Input price | $1.75 / 1M tokens |
| Output price | $14 / 1M tokens |
| Input modalities | text, image, file |
| Output modalities | text |
| Model ID | openai/gpt-5.3-codex |
Pricing is per 1M tokens, indicative pricing via OpenRouter (updated 2026-08-22); a provider's own list price may differ.
Frequently asked questions
How much does GPT-5.3-Codex cost?
Indicative pricing (via OpenRouter, updated 2026-08-22) is $1.75 per 1M input tokens and $14 per 1M output tokens. A provider's own list price may differ. On Vincony, GPT-5.3-Codex is available on credit-based pricing alongside 800+ other models.
What is GPT-5.3-Codex's context window?
GPT-5.3-Codex supports a context window of up to 400,000 tokens (400K), which is how much text it can consider at once.
Who makes GPT-5.3-Codex?
GPT-5.3-Codex is built by OpenAI. You can access it — and compare it against other providers' models — through Vincony's multi-model platform.
How do I use GPT-5.3-Codex?
You can use GPT-5.3-Codex directly through OpenAI, or via Vincony, which aggregates 800+ models (including GPT-5.3-Codex) into one interface with side-by-side comparison and credit-based pricing.