How much does the GPT-5.3-Codex API cost?

$1.05 per million input tokens and $8.40 per million output tokens, with cached input at $0.105. OpenAI's list price is $1.75 and $14.00, so this is 40% under OpenAI's list price.

Is GPT-5.3-Codex free?

It is pay as you go: prepaid credit from $10, with no subscription or monthly fee, billed per token. A 1,000-token prompt with a 500-token reply costs about $0.0053.

What is the GPT-5.3-Codex context window?

GPT-5.3-Codex has a 400,000-token context window, with up to 128,000 output tokens per request. It takes text and image input.

What is the GPT-5.3-Codex model id?

gpt-5.3-codex. Send it as the model through the OpenAI SDK with base URL https://api.uplinkswitch.com/v1.

UplinkSwitch

Models / OpenAI

GPT-5.3-Codex API pricing

$1.05 in, $8.40 out per million tokens, 40% under OpenAI's list price.

gpt-5.3-codexmanaged routeOpenAI SDK

Price · per million tokens, USD

Tokens	OpenAI list price	UplinkSwitch	Saving
Input	$1.75	$1.05	-40%
Cached input	$0.175	$0.105	-40%
Output	$14.00	$8.40	-40%

List price: OpenAI's published rate, read October 2026. Same price on every host.

Real-model check: No answer at the last check

GPT-5.3-Codex specs

Context window: 400,000 tokens
Max output: 128,000 tokens
Input: text and image
Released: February 24, 2026

GPT-5.3-Codex API · base URL and key

Python · OpenAI SDK

from openai import OpenAI

client = OpenAI(
    base_url="https://api.uplinkswitch.com/v1",
    api_key="sk-uplink-live-...",
)

completion = client.chat.completions.create(
    model="gpt-5.3-codex",
    messages=[{"role": "user", "content": "Summarize this in one line."}],
)
print(completion.choices[0].message.content)

TypeScript · OpenAI SDK

import OpenAI from 'openai';

const client = new OpenAI({
  baseURL: 'https://api.uplinkswitch.com/v1',
  apiKey: 'sk-uplink-live-...',
});

const completion = await client.chat.completions.create({
  model: 'gpt-5.3-codex',
  messages: [{ role: 'user', content: 'Summarize this in one line.' }],
});
console.log(completion.choices[0].message.content);

curl

curl https://api.uplinkswitch.com/v1/chat/completions \
  -H "authorization: Bearer sk-uplink-live-..." \
  -H "content-type: application/json" \
  -d '{"model":"gpt-5.3-codex","messages":[{"role":"user","content":"Hello"}]}'

Guides: Cursor, Cline, Roo Code, Kilo Code, SDKs.

What would it cost? · paste a prompt, priced before you send it

Prompt

Answer length, tokens

Input is counted at about 4 characters per token.

Cheapest first. A real request is billed on the provider's own token count. Same estimate as JSON: POST https://api.uplinkswitch.com/v1/estimate, no key needed.

GPT-5.3-Codex questions

How much does the GPT-5.3-Codex API cost?: $1.05 per million input tokens and $8.40 per million output tokens, with cached input at $0.105. OpenAI's list price is $1.75 and $14.00, so this is 40% under OpenAI's list price.
Is GPT-5.3-Codex free?: It is pay as you go: prepaid credit from $10, with no subscription or monthly fee, billed per token. A 1,000-token prompt with a 500-token reply costs about $0.0053.
What is the GPT-5.3-Codex context window?: GPT-5.3-Codex has a 400,000-token context window, with up to 128,000 output tokens per request. It takes text and image input.
What is the GPT-5.3-Codex model id?: gpt-5.3-codex. Send it as the model through the OpenAI SDK with base URL https://api.uplinkswitch.com/v1.

Read: GPT API cost per request, October 2026: a chat turn and a long document.

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