Enterprise AI with GPT in Turkey - The Unified AI API Platform

What Is OpenAI GPT?

About the technology and the company behind the model

OpenAI was founded in San Francisco in 2015 with the mission of ensuring that artificial general intelligence benefits all of humanity. GPT-3 put large language models on every developer's radar, and the launch of ChatGPT in November 2022 turned AI from a research curiosity into an everyday tool. Since then, the GPT family has remained the most widely called model series in the world, with each generation resetting the bar for reasoning, coding and multimodal understanding.

The current peak of the family is the GPT-5.5 generation. GPT-5.5 Pro is the pro-tier flagship, built for the hardest research, architecture and analysis work, while GPT-5.5 serves the same generation's everyday production workloads. Alongside them, the proven GPT-5.4, the balanced GPT-5.4 Mini and the high-volume GPT-5.4 Nano give the lineup an option for every scale, from a single prototype to millions of requests a day. Built-in reasoning, image understanding, function calling and structured outputs are standard across the series.

For teams that want GPT API access from Turkey, payment and compliance have always been the hard part. Onysoft AI Gateway — operated by Izmir-based Onysoft Veri Merkezi A.S. — removes that friction: you top up a balance in Turkish Lira, pay as you go at current TL prices calculated with the Central Bank of Turkey's daily rate, and never commit to a subscription. Every top-up comes with a corporate e-invoice, the platform operates in compliance with KVKK, Turkey's data protection law, and support is available 24/7 in Turkish. Your existing OpenAI SDK code works unchanged once you point base_url to https://api.onysoft.com/v1 — and the same key unlocks more than 708 models.

OpenAI's roadmap is moving from single-shot answers toward agentic systems that carry out long-running tasks on their own. Onysoft adds new GPT models to its catalog on launch day, so developers in Turkey can follow that shift without ever hitting a currency or card barrier.

business

Provider

OpenAI

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Founded

2015

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Headquarters

San Francisco, USA

GPT Performance Metrics

Results from industry-standard benchmark tests

MMLU Multi-Domain Knowledge 88.7

HumanEval Code Generation 90.2

MATH Mathematics 76.6

GPQA Scientific Reasoning 53.6

* Benchmark results are based on data published by the respective providers and may be updated.

Why Choose GPT?

The World's Most Widely Used AI Model Family

psychology

Built-In Reasoning

The GPT-5.5 generation adjusts its thinking depth to the difficulty of the task. It reasons step by step through complex math, legal and strategy questions — no separate reasoning model required.

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Multimodal Understanding

Process text and images in a single request: build invoice reading, screenshot analysis, product-photo tagging and document understanding applications.

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Agentic Coding

The GPT-5.5 series works with tools across multi-step coding tasks, handling code generation, refactoring, code review and test writing end to end.

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Function Calling & Structured Output

Expose your external APIs to the model as tools and get responses that match your JSON schema exactly. No more parsing errors in production integrations.

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Scale with Mini and Nano

GPT-5.4 Mini is built for balance, Nano for volume: run classification, summarization and tagging jobs across millions of requests economically at current TL prices.

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Compliant Access via Onysoft

A KVKK-compliant platform with corporate e-invoicing and 24/7 Turkish support. Data you send through the API is never used for model training.

GPT Models and Pricing

GPT models available in TL through Onysoft AI Gateway

Recommended

GPT-5.6 Sol

New Flagship

The most capable member of OpenAI's brand-new 5.6 generation. 1M+ token context; built for the hardest reasoning, coding and analysis work. A -pro variant (gpt-5.6-sol-pro) is also available.

openai/gpt-5.6-sol play_circle Try

arrow_downward Input: ₺0,36 / 1K tokens

arrow_upward Output: ₺2,14 / 1K tokens

GPT-5.6 Terra

New

The price/performance sweet spot of the 5.6 family. 1M+ context for everyday production workloads, agents and assistants.

openai/gpt-5.6-terra play_circle Try

arrow_downward Input: ₺0,07 / 1K tokens

arrow_upward Output: ₺0,43 / 1K tokens

GPT-5.6 Luna

New

The fast, economical tier of the 5.6 family. High-volume pipelines, classification and summarization at scale — still with 1M+ context.

openai/gpt-5.6-luna play_circle Try

arrow_downward Input: ₺0,01 / 1K tokens

arrow_upward Output: ₺0,04 / 1K tokens

GPT-5.5 Pro

Previous-generation pro-tier flagship. Maximum accuracy on hard reasoning, coding and analysis tasks.

openai/gpt-5.5-pro play_circle Try

arrow_downward Input: ₺2,14 / 1K tokens

arrow_upward Output: ₺12,85 / 1K tokens

GPT-5.5

New

The general-purpose model of the latest generation. Top-tier intelligence and speed for everyday production workloads.

openai/gpt-5.5 play_circle Try

arrow_downward Input: ₺0,36 / 1K tokens

arrow_upward Output: ₺2,14 / 1K tokens

GPT-5.4

Powerful

The proven, powerful general-purpose model. A reliable choice for enterprise workloads with a broad capability set.

openai/gpt-5.4 play_circle Try

arrow_downward Input: ₺0,18 / 1K tokens

arrow_upward Output: ₺1,07 / 1K tokens

GPT-5.4 Mini

Popular

The balance of speed, cost and intelligence. The workhorse for chatbots and mid-scale automation.

openai/gpt-5.4-mini play_circle Try

arrow_downward Input: ₺0,05 / 1K tokens

arrow_upward Output: ₺0,32 / 1K tokens

GPT-5.4 Nano

Budget

The most economical GPT. Built for classification, summarization and high-volume tasks.

openai/gpt-5.4-nano play_circle Try

arrow_downward Input: ₺0,01 / 1K tokens

arrow_upward Output: ₺0,09 / 1K tokens

view_list View All Models and Pricing

GPT Use Cases

What businesses in Turkey can build with GPT

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Customer Support & Chatbots

Build smart assistants that serve your customers 24/7 on web, mobile and WhatsApp. GPT-5.4 Mini carries most support scenarios on its own.

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Software Development

Code generation, code review, bug analysis, test writing and legacy-code explanation. GPT-5.5 accelerates every step of the dev cycle, from IDE assistants to CI bots.

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E-Commerce

Generate descriptions and SEO copy for thousands of products, analyze customer reviews, power smart search and personalized recommendations. Nano handles catalog-scale work economically.

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Document Analysis & Legal

Contract summarization, regulation scanning, report extraction and form-data capture. The large context window processes long documents in a single request.

analytics

Data Analysis & Reporting

Turn raw data into executive summaries: build internal tools that interpret sales reports, financial statements and survey results in natural language.

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Education Technology

Personalized tutoring, automatic question generation, exam grading and student support systems. Strong performance on Turkish-language curriculum content.

Which Sectors Does GPT Serve?

Sectors using GPT through Onysoft AI Gateway

Technology E-Commerce Finance Healthcare Education Marketing Media Logistics

How to Get Started with GPT?

Start using GPT models in your project in 3 steps

1

Create an Account

Sign up to Onysoft AI Gateway for free. Sign in instantly with your email address or your GitHub/Google account. Your API key is generated automatically.

2

Add Balance

Add as much balance as you like in Turkish Lira. You can pay by bank transfer/EFT, credit card or corporate invoice. Transparent TL pricing with the current TCMB exchange rate.

3

Start Using the API

Thanks to our OpenAI-compatible API endpoint, access GPT models without changing your existing code. Just change the base_url and api_key.

from openai import OpenAI

client = OpenAI(
    api_key="sk-ony-...",
    base_url="https://api.onysoft.com/v1"
)

response = client.chat.completions.create(
    model="openai/gpt-5.6-sol",
    messages=[{"role": "user", "content": "Merhaba!"}]
)
print(response.choices[0].message.content)

import OpenAI from 'openai';

const client = new OpenAI({
    apiKey: 'sk-ony-...',
    baseURL: 'https://api.onysoft.com/v1'
});

const response = await client.chat.completions.create({
    model: 'openai/gpt-5.6-sol',
    messages: [{role: 'user', content: 'Merhaba!'}]
});
console.log(response.choices[0].message.content);

curl https://api.onysoft.com/v1/chat/completions \
  -H "Authorization: Bearer sk-ony-..." \
  -H "Content-Type: application/json" \
  -d '{
    "model": "openai/gpt-5.6-sol",
    "messages": [{"role": "user", "content": "Merhaba!"}]
  }'

$ch = curl_init('https://api.onysoft.com/v1/chat/completions');
curl_setopt_array($ch, [
    CURLOPT_HTTPHEADER => [
        'Authorization: Bearer sk-ony-...',
        'Content-Type: application/json'
    ],
    CURLOPT_POSTFIELDS => json_encode([
        'model' => 'openai/gpt-5.6-sol',
        'messages' => [['role' => 'user', 'content' => 'Merhaba!']]
    ]),
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_POST => true
]);
$response = json_decode(curl_exec($ch));
echo $response->choices[0]->message->content;

Why Use GPT with Onysoft?

The advantages of choosing Onysoft AI Gateway over the OpenAI API directly

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Pay in Turkish Lira

No foreign credit card needed. Transparent pricing in TL with the current TCMB exchange rate. Bank transfer, credit card or corporate invoice.

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Invoicing in Turkey

As a company based in Turkey, we issue e-invoices and e-archive invoices. Your accounting processes run smoothly.

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One API, All Models

Access 370+ models including GPT just by changing the base_url. OpenAI SDK compatible.

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24/7 Support in Turkish

Our Turkish-speaking technical support team is always with you. Integration help and issue resolution.

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KVKK Compliant

Data processing policies aligned with Turkish regulations. Enterprise data security standards.

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Cost Optimization

Switch easily between different models as your needs change. Optimize your budget.

Frequently Asked Questions About GPT

What people wonder about GPT and Onysoft AI Gateway

How do I access the GPT API from Turkey? expand_more

Sign up for Onysoft AI Gateway and top up your balance in Turkish Lira — that's it. No OpenAI account, foreign credit card or VPN is needed; you get your API key and start sending requests within minutes.

How does GPT API pricing work in Turkish Lira? expand_more

Billing is token-based and pay-as-you-go — there is no subscription. USD prices are converted to TRY at the Central Bank of Turkey's current exchange rate and deducted from your TL balance; current TL prices are shown on the model cards on this page.

Is my data safe? How is privacy handled? expand_more

Onysoft AI Gateway is operated by Izmir-based Onysoft Veri Merkezi A.S. in compliance with KVKK, Turkey's data protection law. Content sent through the API is not used for model training, and enterprise data-processing agreements are available through the support team.

Which GPT model should I choose? expand_more

Use GPT-5.5 Pro for the hardest reasoning and analysis work, GPT-5.5 for demanding day-to-day tasks and GPT-5.4 as the proven general-purpose choice. GPT-5.4 Mini offers the best balance for chatbots and mid-scale automation, while GPT-5.4 Nano wins on high-volume simple tasks.

What makes GPT-5.5 Pro special? expand_more

GPT-5.5 Pro is the newest pro-tier flagship of the family; it reasons more deeply before answering and targets maximum accuracy on complex problems. It is built for work where mistakes are expensive — R&D, architecture decisions and multi-step analysis.

Will my existing OpenAI SDK code work with Onysoft? expand_more

Yes — no rewrite needed. Set base_url to https://api.onysoft.com/v1 in your OpenAI SDK and use your Onysoft API key; everything keeps working, including streaming, function calling and structured outputs.

What are the context window and limits for GPT models? expand_more

The GPT-5 generation offers context windows in the hundreds of thousands of tokens — enough to process book-length documents in a single request. Each model's current context and output limits are listed on its detail page in the catalog.

Can I get a corporate invoice? expand_more

Yes. A corporate e-invoice (e-fatura) is issued with your company details for every balance top-up, so your GPT API spending fits cleanly into your accounting and tax processes.

Can I try GPT models without writing code? expand_more

Yes — the Onysoft Playground lets you test every GPT model right in your browser. Run the same prompt on GPT-5.5 and GPT-5.4 Mini side by side and decide which model your task really needs before integrating.

Is there a subscription or minimum commitment? expand_more

No. Onysoft is fully pay-as-you-go: no monthly fee, no commitment, no minimum spend. Your balance simply sits in your account until you use it, and only the tokens you actually consume are charged.

smart_toy OpenAI GPT