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OpenAI: Gpt 5 Codex

OpenAI chat
openai/gpt-5-codex

GPT-5-Codex is a specialized version of GPT-5 optimized for software engineering and coding workflows. It is designed for both interactive development sessions and long, independent execution of complex engineering tasks....

At a glance

Model specifications

The most important technical and pricing details in one place.

Context window
1M tokens
Model type
Chat
Input / 1M
$1.25
Output / 1M
$10.00

Providers and routing order

Gateway-compatible routes are tried from the lowest cost; other sources are shown for catalog reference.

1 source
1
OpenAIGateway activegpt-5-codex · Updated 13.09.2026 18:17
Input$1.2500 / 1M Output$10.0000 / 1M Cache$0.1250 / 1M Media-
Live telemetry

Usage and performance

Current request, token, and latency data across TamgaStudio.

Usage Example

Call OpenAI: Gpt 5 Codex with a single request through the OpenAI-compatible TamgaStudio API. Create your API key from the API Keys section in your dashboard.

curl https://api.tamga.studio/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer tl-sk-XXXXXX" \
  -d '{"model": "openai/gpt-5-codex", "messages": [{"role": "user", "content": "Hello!"}]}'
import requests

resp = requests.post(
    "https://api.tamga.studio/v1/chat/completions",
    headers={"Authorization": "Bearer tl-sk-XXXXXX"},
    json={
        "model": "openai/gpt-5-codex",
        "messages": [{"role": "user", "content": "Hello!"}],
    },
)
print(resp.json()["choices"][0]["message"]["content"])
<?php
$ch = curl_init('https://api.tamga.studio/v1/chat/completions');
curl_setopt_array($ch, [
    CURLOPT_POST => true,
    CURLOPT_HTTPHEADER => [
        'Authorization: Bearer tl-sk-XXXXXX',
        'Content-Type: application/json',
    ],
    CURLOPT_POSTFIELDS => json_encode([
        'model' => 'openai/gpt-5-codex',
        'messages' => [['role' => 'user', 'content' => 'Hello!']],
    ]),
    CURLOPT_RETURNTRANSFER => true,
]);
echo curl_exec($ch);

Frequently Asked Questions

Common questions about this model.

What is OpenAI: Gpt 5 Codex?
GPT-5-Codex is a specialized version of GPT-5 optimized for software engineering and coding workflows. It is designed for both interactive development sessions and long, independent execution of complex engineering tasks.... It is accessible through a single OpenAI-compatible API via TamgaStudio.
How much does OpenAI: Gpt 5 Codex cost?
Pricing is $1.25 per 1M input tokens and $10.00 per 1M output tokens. Billing is credit-based: you only pay for what you use.
What is the context length of OpenAI: Gpt 5 Codex?
OpenAI: Gpt 5 Codex supports a context of up to 1,048,576 tokens in one request.
Can I use OpenAI: Gpt 5 Codex with the OpenAI SDK?
Yes. TamgaStudio exposes all models through an OpenAI-compatible endpoint: https://api.tamga.studio/v1/chat/completions. Just swap the base URL and API key in your existing OpenAI code.
How do I get an API key?
After signing in, create a key from the "API Keys" section of your dashboard. The key is shown only once and is stored as a SHA-256 hash.