GPT-5.3 Codex API
Access GPT-5.3 Codex through a simple, OpenAI-compatible API. Change one URL and one key — your existing code works immediately. No SDK changes needed.
GPT-5.3 Codex Pricing
| Token Type | Qubax | Retail | Save |
|---|---|---|---|
| Input (per 1M) | $0.114 | $1.75 | 94% |
| Output (per 1M) | $0.908 | $14.00 | 94% |
At $0.114/1M input tokens, GPT-5.3 Codex is one of the most affordable APIs in its class.
Why use GPT-5.3 Codex API on Qubax?
- ⚡Point your OpenAI SDK at https://api.qubax.ai/v1
- ⚡Use model ID: gpt-5.3-codex
- ⚡Generate API keys starting with qbx_live_
- ⚡Full streaming, function calling, and vision support
About GPT-5.3 Codex
GPT-5.3 Codex is a text generation model available on Qubax. It supports a 400K-token context window and up to 128K output tokens per request. Native capabilities include reasoning, vision, tool calling, structured output, streaming, context caching. On Qubax it is served by 461 independent sellers, so pricing stays competitive and uptime stays high.
GPT-5.3 Codex API Access — code example
from openai import OpenAI
# Only two lines change vs the official API:
client = OpenAI(
base_url="https://api.qubax.ai/v1",
api_key="qbx_live_YOUR_KEY",
)
response = client.chat.completions.create(
model="gpt-5.3-codex",
messages=[{"role": "user", "content": "Hello, GPT-5.3 Codex!"}],
)
print(response.choices[0].message.content)More OpenAI models on Qubax
Get started in 60 seconds
- 1Create a free account at qubax.ai/register
- 2Add crypto credits (200+ coins, $3 minimum, credits never expire)
- 3Generate an API key and set your base URL to
https://api.qubax.ai/v1 - 4Use model ID
gpt-5.3-codex— done!
GPT-5.3 Codex API Access FAQ
How much does GPT-5.3 Codex cost API?
On Qubax, GPT-5.3 Codex costs $0.114 per 1M input tokens and $0.908 per 1M output tokens. 94% cheaper than OpenRouter. Pay with 200+ cryptocurrencies.
Can I use GPT-5.3 Codex with my existing tools?
Yes. Qubax is fully OpenAI-compatible. Change your base URL to api.qubax.ai/v1 and use your Qubax key. Works with Cline, Cursor, OpenCode, LangChain, and any OpenAI SDK.
Do I need a credit card?
No. Qubax accepts 200+ cryptocurrencies. No credit card, no KYC.