GPT-5.2 Pro
Access GPT-5.2 Pro through one API key. Previous-gen premium reasoning model.
OpenAI's previous premium reasoning model. Deep chain-of-thought reasoning for complex problems.
No credit card required. Takes 30 seconds.
2,400+
Developers
1.2M+
API calls served
100+
Endpoints
$0.01
Per call
Yep, that's it.
Try it live
Send a message and see GPT-5.2 Pro respond in real time.
Maximum tokens in the response.
Real-time tokens
Context Window
400K tokens
Max Output
128K tokens
Input Price
$31.02 / 1M tokens
Output Price
$248.14 / 1M tokens
Strengths
GPT-5.2 Pro is a reasoning model that performs extended chain-of-thought, working through complex, multi-step problems before answering.
A 400,000-token context window lets it hold large problem statements, datasets, and supporting material while it reasons.
Up to 128,000 output tokens per response allow detailed proofs, derivations, and long structured analyses.
Aimed at the hardest tasks — algorithm design, formal reasoning, and intricate planning — where depth outweighs cost.
Quick start
Copy this snippet and start making calls with GPT-5.2 Pro.
const res = await fetch('https://api.yepapi.com/v1/ai/chat', {
method: 'POST',
headers: {
'x-api-key': 'YOUR_API_KEY',
'Content-Type': 'application/json',
},
body: JSON.stringify({
"model": "openai/gpt-5.2-pro",
"messages": [
{
"role": "user",
"content": "Explain API gateways in 2 sentences."
}
],
"maxTokens": 256
}),
});
const { data } = await res.json();
console.log(data.message.content);Why use GPT-5.2 Pro through YepAPI?
GPT-5.2 Pro API: previous-gen premium reasoning model
GPT-5.2 Pro is OpenAI's previous premium reasoning model, built for deep chain-of-thought on complex problems. It pairs a 400K-token context window with up to 128K output tokens, and is priced as a premium tier at $31.02 per 1M input tokens and $248.14 per 1M output tokens.
Through YepAPI you access GPT-5.2 Pro with one OpenAI-compatible API key. That key also reaches more affordable models for routine work, plus SEO, SERP, and web-scraping endpoints, so you can route hard problems to Pro and everything else elsewhere.
What is GPT-5.2 Pro?
GPT-5.2 Pro is OpenAI's previous-generation premium reasoning model, designed for deep, extended chain-of-thought on the hardest problems. Rather than answering quickly, it works through multi-step logic, making it suited to algorithm design, formal proofs, intricate planning, and complex technical analysis. It carries a 400,000-token context window and can produce up to 128,000 output tokens, enough to lay out long derivations and detailed solutions. As a premium reasoning tier it is priced accordingly at $31.02 per 1M input and $248.14 per 1M output tokens, reflecting the heavy compute behind its reasoning.
Build with GPT-5.2 Pro via YepAPI
Send requests to the OpenAI-compatible /v1/ai/chat endpoint with your YepAPI key. The standard Chat Completions schema lets you call it from existing SDKs by changing the base URL and model name. Reserve it for genuinely hard tasks — verification, optimization, and complex design — and route cheaper work to other models on the same key. That single key also covers SEO, SERP, and scraping APIs, so reasoning tasks can draw on freshly gathered data when needed.
GPT-5.2 Pro API pricing — $31.02 / $248.14 per 1M tokens
GPT-5.2 Pro costs $31.02 per 1M input tokens and $248.14 per 1M output tokens, reflecting its premium reasoning compute. Because reasoning models generate long internal chains, output cost dominates, so it is best used selectively for problems that justify the depth. With one YepAPI key you can send only the hardest queries here and bill cheaper models for the rest, keeping overall spend controlled.
GPT-5.2 Pro for complex reasoning tasks
The model is built for problems where correctness and depth matter more than price: designing distributed algorithms, proving system properties, untangling intricate logic, and planning multi-constraint solutions. Its 400K context can hold an entire specification while it reasons, and the 128K output gives room for rigorous, step-by-step answers. Use it as a specialist you call when other models fall short on the genuinely difficult tasks.
Try GPT-5.2 Pro free
New YepAPI accounts include $5 in free credit with no card required. That lets you put a hard, real-world problem to GPT-5.2 Pro and judge the quality of its reasoning before deciding to rely on the premium tier.
Start generating in 30 seconds
$5 free credit on signup. No credit card required. Pay per call.
What developers say
“Switched from SerpAPI and cut our SERP costs by 80%. Same data quality, way simpler billing.”
“One API key for AI models, SERP data, and web scraping. Saved us from managing 4 separate providers.”
“The $5 free credit let us prototype our entire rank tracking feature before committing. No other API does that.”
Frequently asked questions
OpenAI's previous premium reasoning model. Deep chain-of-thought reasoning for complex problems.
Input tokens cost $31.02 per 1M tokens and output tokens cost $248.14 per 1M tokens through YepAPI. No monthly minimums — you only pay for what you use.
Sign up for a free API key, then send requests to the /v1/ai/chat endpoint.
GPT-5.2 Pro supports a 400K token context window with up to 128K output tokens per request.
Ready to use GPT-5.2 Pro?
$5 free credit on signup. No credit card required. Pay per call.
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