GPT-5.5 Pro API
OpenAI’s reasoning flagship, half price.
GPT-5.5 Pro — OpenAI’s deepest-reasoning model, served at $5 input / $30 output per million tokens. Identical model and capabilities, half the cost. Drop-in OpenAI-SDK compatible.
Independent third-party API aggregator. Not affiliated with or endorsed by any model provider; model names are trademarks of their respective owners.
See what you can create
Frontier reasoning
“Multi-step math, formal proofs, scientific reasoning at SOTA quality”
Agentic coding
“Plan, execute, and verify multi-file refactors with tool use”
Research synthesis
“Read 100 papers, synthesize findings with proper citations”
Complex tool orchestration
“Multi-tool agents that plan, branch, and self-correct”
GPT-5.5 Pro pricing comparison
Verified per-million-token pricing vs OpenAI direct
Integrate in minutes
Standard REST API that works with any language. One API key gives you access to all models.
- Single endpoint for all models
- Bearer token authentication
- JSON request & response
- Webhook callbacks for async jobs
- Python & Node.js SDK available
# GPT-5.5 Pro for deep reasoning, drop-in OpenAI-SDK
from openai import OpenAI
client = OpenAI(
api_key="hyp-...",
base_url="https://api.hypereal.cloud/v1",
)
resp = client.chat.completions.create(
model="gpt-5.5-pro",
messages=[
{"role": "user", "content": "Prove that the sum of two odd integers is even, formally."},
],
reasoning_effort="high",
)
print(resp.choices[0].message.content)Why GPT-5.5 Pro
50% off OpenAI Pro pricing
$5 input / $30 output per million tokens vs $10 / $60 official. Same reasoning depth, same model variants.
Configurable reasoning effort
Set reasoning_effort to low, medium, or high to trade latency for depth — same parameter as official OpenAI Pro.
400K context, 128K max output
Full GPT-5.5 Pro spec: 400,000-token input, 128,000-token output. Handles entire codebases and large documents.
Which credits get consumed?
One API key works for both. Routing is decided by the model you call, not by the key.
Claude, GPT, and Gemini coding models spend the same Hypereal Credits wallet. Your selected top-up amount can reduce charges on these coding models.
Video, image, audio, 3D, GPU, training, and other model APIs use the prices shown on their product pages.
Frequently asked questions
Is this real GPT-5.5 Pro or a distilled cheaper variant?
Real GPT-5.5 Pro — same weights, same outputs, same reasoning_effort parameter. Hypereal is an aggregator, not a fine-tune.
When should I use Pro vs regular GPT-5.5?
Pro for deep multi-step reasoning, math, formal logic, or agentic planning. Regular GPT-5.5 for general chat, summarization, and code completion — it is 8x cheaper and faster for those workloads.
Does reasoning_effort=high cost more?
Higher reasoning_effort uses more reasoning tokens, which are billed as output tokens. This matches the official OpenAI billing exactly — just at 50% the rate.
Is there a free trial?
No. Sign up and buy credits to try Pro on real workloads. Credits start at $10 with no subscription.
How does billing work?
Pay per token using credits. 100 credits = $1. Card and crypto accepted, no subscription required, no monthly reset.
Frontier reasoning, half the bill.
Same GPT-5.5 Pro, drop-in OpenAI-SDK, 50% off. Credits start at $10.