How much does GPT 5 Codex cost?

GPT 5 Codex is billed pay-as-you-go at $2.67 per 1M input tokens and $21.42 per 1M output tokens. There is no subscription — you only pay for what you use.

What is the context window of GPT 5 Codex?

GPT 5 Codex supports a context window of up to 400K tokens. It can return up to 128K tokens in a single response.

What can GPT 5 Codex do?

GPT 5 Codex supports Vision, Tool calling, Reasoning.

Is GPT 5 Codex free to use?

GPT 5 Codex is a paid, pay-as-you-go model — no subscription, you are only charged for usage.

How do I use GPT 5 Codex via the API?

GPT 5 Codex is OpenAI-compatible. Point any OpenAI SDK at https://api.airforce/v1 and pass the model ID gpt-5-codex with your Api.Airforce API key.

Who makes GPT 5 Codex?

GPT 5 Codex is OpenAI's chat model, served through the unified Api.Airforce gateway alongside 100+ other models.

OpenAIPaidOperational

GPT 5 Codex

API model name: gpt-5-codex

GPT 5 Codex is OpenAI's chat model, served on the Api.Airforce unified API. It has a 400K-token context window. Beyond text, it accepts image as input. Capabilities include Vision, Tool calling, Reasoning. It is priced at $2.67 per million input tokens and $21.42 per million output tokens. Knowledge cutoff: 2024-09-30. Access it through the OpenAI-compatible API with one key, alongside 100+ other models on Api.Airforce.

Get an API key View pricing

Pricing

Input / 1M tokens

$2.67

Output / 1M tokens

$21.42

Cache read / 1M tokens

$0.27

Specifications

Provider: OpenAI
Type: chat model
Context window: 400K tokens
Max output: 128K tokens
Knowledge cutoff: 2024-09-30
Input: text, image
Output: text

Capabilities

VisionTool callingReasoningStreaming

Benchmarks

Independent evaluations and measured speed from Artificial Analysis.

Intelligence Index

36.1/100

Math Index

98.7/100

MMLU-Pro87%

GPQA Diamond84%

Humanity's Last Exam26%

LiveCodeBench84%

AIME 202599%

Output speed180.4 tok/s

Time to first token8.14 s

Source: Benchmark data by Artificial Analysis (artificialanalysis.ai)

What is GPT 5 Codex used for?

Chatbots & assistants — conversational AI, drafting, summarizing and Q&A.
Image understanding — analyze photos, screenshots, charts and scanned documents.
Agents & automation — function calling and tool use for multi-step workflows.
Complex reasoning — math, coding and step-by-step problem solving.
Long-context tasks — process entire documents or codebases in a single prompt.
Real-time experiences — stream tokens for responsive chat and apps.

GPT 5 Codex vs. similar models

Model	Intelligence	Context	Input / 1M	Output / 1M
GPT 5 Codex	36.1	400K	$2.67	$21.42
GPT 3.5	—	—	$0.47	$1.39
GPT 3.5 Turbo 16k	—	—	$10.26	$20.52
GPT 4	7.0	8K	$64.26	$128.52

Prices are Api.Airforce pay-as-you-go rates per 1M tokens. Context is the maximum input length.

GPT 5 Codex — frequently asked questions

How much does GPT 5 Codex cost?: GPT 5 Codex is billed pay-as-you-go at $2.67 per 1M input tokens and $21.42 per 1M output tokens. There is no subscription — you only pay for what you use.
What is the context window of GPT 5 Codex?: GPT 5 Codex supports a context window of up to 400K tokens. It can return up to 128K tokens in a single response.
What can GPT 5 Codex do?: GPT 5 Codex supports Vision, Tool calling, Reasoning.
Is GPT 5 Codex free to use?: GPT 5 Codex is a paid, pay-as-you-go model — no subscription, you are only charged for usage.
How do I use GPT 5 Codex via the API?: GPT 5 Codex is OpenAI-compatible. Point any OpenAI SDK at https://api.airforce/v1 and pass the model ID gpt-5-codex with your Api.Airforce API key.
Who makes GPT 5 Codex?: GPT 5 Codex is OpenAI's chat model, served through the unified Api.Airforce gateway alongside 100+ other models.

All models·Quickstart·Chat API reference

Use GPT 5 Codex via the API

OpenAI-compatible — point any OpenAI SDK at https://api.airforce/v1 and pass gpt-5-codex as the model.

cURL

curl https://api.airforce/v1/chat/completions \
  -H "Authorization: Bearer $AIRFORCE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-5-codex",
    "messages": [{ "role": "user", "content": "Hello!" }]
  }'

Python

from openai import OpenAI
client = OpenAI(base_url="https://api.airforce/v1", api_key="$AIRFORCE_API_KEY")
r = client.chat.completions.create(
    model="gpt-5-codex",
    messages=[{"role": "user", "content": "Hello!"}],
)
print(r.choices[0].message.content)

JavaScript

import OpenAI from "openai";
const client = new OpenAI({ baseURL: "https://api.airforce/v1", apiKey: process.env.AIRFORCE_API_KEY });
const r = await client.chat.completions.create({
  model: "gpt-5-codex",
  messages: [{ role: "user", content: "Hello!" }],
});
console.log(r.choices[0].message.content);