GPT-5.3 Codex API
openai/gpt-5.3-codex
Call GPT-5.3 Codex through UberLLM’s OpenAI-compatible API — from $0.0176/M input and $0.1407/M output, routed automatically to the cheapest healthy seller. OpenAI · 400,000 token context. Fee included.
GPT-5.3 Codex pricing
- Input
- $0.0176
- Output
- $0.1407
- Cached input
- $0.00176
- Input
- $1.925
- Output
- $15.40
- Cached input
- $0.1925
| Provider | Input | Output | Cached input |
|---|---|---|---|
| Venice AI | $1.75 | $14.00 | $0.175 |
| OpenRouter | $1.75 | $14.00 | $0.175 |
| Jatevo | $2.19 | $17.50 | $0.219 |
UberLLM routes every request to the cheapest healthy seller for this model. The price shown includes UberLLM’s 10% fee.
How to use GPT-5.3 Codex with the OpenAI SDK
Already using the OpenAI SDK? Change one line — the base URL — and call GPT-5.3 Codex with your existing code. Anthropic SDKs work against https://api.uberllm.dev/v1/messages.
from openai import OpenAI
client = OpenAI(
base_url="https://api.uberllm.dev/v1",
api_key="ull_your_key_here",
)
resp = client.chat.completions.create(
model="openai/gpt-5.3-codex",
messages=[{"role": "user", "content": "Hello!"}],
)
print(resp.choices[0].message.content)GPT-5.3 Codex API — FAQ
How much does the GPT-5.3 Codex API cost?
GPT-5.3 Codex is listed from $0.0176 per million input tokens and $0.1407 per million output tokens through UberLLM, which routes each request to the cheapest healthy seller on a live marketplace and bills the price shown, which includes UberLLM's 10% fee.
How do I call GPT-5.3 Codex via API?
Use any OpenAI-compatible SDK: set the base URL to https://api.uberllm.dev/v1, your UberLLM API key, and model "openai/gpt-5.3-codex". Anthropic SDKs work via https://api.uberllm.dev/v1/messages.
Is GPT-5.3 Codex OpenAI-compatible on UberLLM?
Yes. Every model on UberLLM — including GPT-5.3 Codex — is served through one OpenAI-compatible endpoint, so you change only the base URL and key.