GPT-5.1 Codex
API model name: gpt-5.1-codex
GPT-5.1 Codex is OpenAI's chat model, served on the Api.Airforce unified API. Capabilities include Vision, Tool calling, Reasoning. It is priced at $0.66 per million input tokens and $5.20 per million output tokens. That is below the provider's $1.25 official input rate. Access it through the OpenAI-compatible API with one key, alongside 100+ other models on Api.Airforce.
Pricing
Api.Airforce price vs. the provider's official rate.-47%
Specifications
- Provider
- OpenAI
- Type
- chat model
Capabilities
Benchmarks
Independent evaluations and measured speed from Artificial Analysis.
GPT-5.1 Codex (High)
Source: Benchmark data by Artificial Analysis (artificialanalysis.ai)
What is GPT-5.1 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.
GPT-5.1 Codex vs. similar models
| Model | Intelligence | Context | Input / 1M | Output / 1M |
|---|---|---|---|---|
| GPT-5.1 Codex | 23.7 | — | $0.66 | $5.20 |
| Babbage 002 | — | — | $0.34 | $0.34 |
| ChatGPT-4o Latest | — | — | $2.75 | $14.50 |
| Codex Auto Review | — | — | $0.09 | $0.56 |
Prices are Api.Airforce pay-as-you-go rates per 1M tokens. Context is the maximum input length.
Related models
GPT-5.1 Codex — frequently asked questions
- How much does GPT-5.1 Codex cost?
- GPT-5.1 Codex is billed pay-as-you-go at $0.66 per 1M input tokens and $5.20 per 1M output tokens. There is no subscription — you only pay for what you use.
- What can GPT-5.1 Codex do?
- GPT-5.1 Codex supports Vision, Tool calling, Reasoning.
- Is GPT-5.1 Codex free to use?
- GPT-5.1 Codex is a paid, pay-as-you-go model — no subscription, you are only charged for usage.
- How do I use GPT-5.1 Codex via the API?
- GPT-5.1 Codex is OpenAI-compatible. Point any OpenAI SDK at https://api.airforce/v1 and pass the model ID gpt-5.1-codex with your Api.Airforce API key.
- Who makes GPT-5.1 Codex?
- GPT-5.1 Codex is OpenAI's chat model, served through the unified Api.Airforce gateway alongside 100+ other models.
Use GPT-5.1 Codex via the API
OpenAI-compatible — point any OpenAI SDK at https://api.airforce/v1 and pass gpt-5.1-codex as the model.
curl https://api.airforce/v1/chat/completions \
-H "Authorization: Bearer $AIRFORCE_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "gpt-5.1-codex",
"messages": [{ "role": "user", "content": "Hello!" }]
}'from openai import OpenAI
client = OpenAI(base_url="https://api.airforce/v1", api_key="$AIRFORCE_API_KEY")
r = client.chat.completions.create(
model="gpt-5.1-codex",
messages=[{"role": "user", "content": "Hello!"}],
)
print(r.choices[0].message.content)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-5.1-codex",
messages: [{ role: "user", content: "Hello!" }],
});
console.log(r.choices[0].message.content);