GPT-5.3-Codex: model ids and price

How to call it

4 ways to use GPT-5.3-Codex, with the model id each provider expects.

Providers, model ids, endpoints and docs for GPT-5.3-Codex
Provider	Model id	Endpoint	Docs
OpenAI API	`gpt-5.3-codex`	`https://api.openai.com/v1/responses`	developers.openai.com
Azure OpenAI (Microsoft Foundry)	`gpt-5.3-codex`		learn.microsoft.com
OpenRouter	`openai/gpt-5.3-codex`		openrouter.ai
Codex (ChatGPT)			chatgpt.com

Pricing

Prices for GPT-5.3-Codex
Input	$1.75 per 1M tokens
Cached input	$0.175 per 1M tokens
Output	$14 per 1M tokens

As published: “per 1M tokens (USD), standard tier”.

Source: developers.openai.com, checked 15 October 2026.

Specs

Input: Text and images
Output: Text
Context window: 400,000 tokens
Max output: 128,000 tokens
Open weights: No
Licence: Proprietary
Training cutoff: August 2025
Released: 5 February 2026
Status: Deprecated
Type: Code model

What stands out

What its maker marketed at launch, and what people found later, each with its source.

Agentic coding specialist

Codex-tuned GPT-5.3 for long-running software engineering (Codex app/CLI/IDE and API).

Source: developers.openai.com
Responses-only

Available only through the Responses API; effort low/medium/high/xhigh.

Source: developers.openai.com

Notes

Latest codex-specific API id on the pricing page. Released in Codex Feb 5 2026; API access followed later (Azure version 2026-02-24). GPT-6 Sol is now positioned for coding. Deprecated 2026-10-01 (with gpt-5.1 and gpt-5.4-nano): removal from the API on Apr 1 2027, replacement gpt-6-sol (https://developers.openai.com/api/docs/deprecations).

curl https://api.openai.com/v1/responses \
 -H "Authorization: Bearer $OPENAI_API_KEY" -H "Content-Type: application/json" \
 -d '{"model":"gpt-5.3-codex","input":"Hello"}'

Sources: