About
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.
Pricing
| Input | $2.45 | per 1M prompt tokens |
|---|---|---|
| Output | $19.60 | per 1M generated tokens, reasoning included |
| Cached input | $0.24 | per 1M tokens read back from the prompt cache |
| Web search | $0.014 | per request that uses the provider’s built-in search |
What a request costs
| Typical request | Each | Per 1,000 |
|---|---|---|
| Short chat reply1,500 in · 400 out | $0.012 | $11.51 |
| Question over a long document40,000 in · 800 out | $0.114 | $113.68 |
| Agent tool step20,000 in · 1,200 out | $0.073 | $72.52 |
At the developer-API rate, before any provider promotion or prompt-cache saving. In the app, the model picker shows what a message costs on your plan before you send it.
Benchmarks
Head-to-head rankings
- #27Godot gamesAgent arenaElo 112445% wins
- #30Android appsAgent arenaElo 108435% wins
- #40Web appsAgent arenaElo 102637% wins
- #41ASCII artModel arenaElo 115451% wins
- #42Full stackAgent arenaElo 98337% wins
- #44Mobile appsAgent arenaElo 105141% wins
- #54SVGModel arenaElo 112754% wins
- #68Game devModel arenaElo 116451% wins
- #73Data vizModel arenaElo 116551% wins
- #80WebsitesModel arenaElo 116449% wins
Scores from Artificial Analysis; bars are scaled to the best model on our list. Rankings from Design Arena head-to-head votes. Published by OpenRouter alongside its catalogue.
Call it from code
OpenAI-compatible: point any OpenAI SDK at https://api.privateer.pro/v1 and set
model. Keys are created in the app under Settings.
cURL
curl https://api.privateer.pro/v1/chat/completions \
-H "Authorization: Bearer $PRIVATEER_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "openai/gpt-5.3-codex",
"messages": [{ "role": "user", "content": "Hello" }],
"reasoning": { "effort": "medium" }
}'Python
import os
from openai import OpenAI
client = OpenAI(
base_url="https://api.privateer.pro/v1",
api_key=os.environ["PRIVATEER_API_KEY"],
)
reply = client.chat.completions.create(
model="openai/gpt-5.3-codex",
messages=[{"role": "user", "content": "Hello"}],
)
print(reply.choices[0].message.content)JavaScript
import OpenAI from "openai";
const client = new OpenAI({
baseURL: "https://api.privateer.pro/v1",
apiKey: process.env.PRIVATEER_API_KEY,
});
const reply = await client.chat.completions.create({
model: "openai/gpt-5.3-codex",
messages: [{ role: "user", content: "Hello" }],
});
console.log(reply.choices[0].message.content);Parameters this model accepts
include_reasoningmax_completion_tokensmax_tokensreasoningreasoning_effortresponse_formatseedstructured_outputstool_choicetoolsverbosity