# openai

What Is ChatGPT? How It Works and How to Use It

What is ChatGPT? ChatGPT is a generative AI chat assistant developed by OpenAI that produces text, answers questions, and completes tasks by conversing in natural language. This guide: a clear definition, how it works, its relationship to the GPT model, how to use ChatGPT, free vs paid, its limits, KVKK, and FAQs.

11 min

Cost Optimization with Prompt Caching: Anthropic vs OpenAI (2026)

Prompt caching cuts input token cost up to 90% on Anthropic and 50% on OpenAI. I cover both approaches, when to pick which, and cache-hit design patterns.

14 min

AI Engineer Salary Report 2026: From 50K TL in Türkiye to $1.28M Globally (Levels.fyi + LinkedIn Data)

In Türkiye, AI Engineer average is 50,500 TL (Eleman.net), Istanbul 75-110K TL, Senior 180K TL+. Globally, OpenAI/Anthropic/DeepMind L6+ roles hit $850K-$1.28M (Levels.fyi). LinkedIn AI Engineer demand YoY +74%. City, experience, equity, tax (Wise, sole-prop), and Türkiye-to-remote transition strategy — complete data report.

Sora 2 vs Veo 3 vs Runway Gen-4 vs Kling 2.6: The 2026 AI Video Mega Comparison (5 Prompts, 4 Models)

Sora 2, Veo 3, Runway Gen-4, and Kling 2.6 — I benchmarked the four leading 2026 AI video models with five identical prompts: Cappadocia balloons, an e-commerce product ad, character consistency, Turkish lip-sync, and a parkour action sequence. A field report on price, audio sync, character fidelity, Turkish e-commerce usage, the OpenAI Sora API shutdown news, and Chinese alternatives (Hailuo, Vidu, Seedance) — with 25+ sources.

Claude Code vs Cursor vs Windsurf 2026 — Senior Developer Comparison (1M Context, Composer 2.5, Cascade)

Claude Code (Anthropic), Cursor (Composer 2.5), and Windsurf (Cascade) — the three major AI coding assistants as of May 2026. SWE-bench Verified and SWE-bench Pro scores, pricing (Pro $20, Max $200, Cursor Business $40, Windsurf Pro $15), agent modes, hybrid setup recommendations, and adoption guidance for Turkish engineering teams.

42 min

What is MCP (Model Context Protocol) and Why Did It Become the 'USB-C of AI' Standard in 2026? — Mapping the 5,000+ Server Ecosystem

Launched by Anthropic in November 2024, the Model Context Protocol (MCP) became the 'USB-C of AI' in 2026 — with 5,000+ servers, adoption by OpenAI, Google, Microsoft, and Salesforce, and its own Wikipedia page. This guide covers MCP's three primitives, transport layer, OAuth 2.1, building your own server, security risks, and Turkish-market opportunities for Yargıtay/BIST/KVKK-style MCPs.

ChatGPT vs Claude vs Gemini: A 50-Prompt Real-World Turkish Test and TR-MMLU 2026 Results

We benchmarked GPT-5.5, Claude Opus 4.7 and Gemini 3.1 Pro on Turkish workloads end to end: TR-MMLU and TUMLU benchmark numbers, a 50-prompt real-world test across legal, finance, code, creative writing and Q&A, an A/B in a Turkish enterprise, TL-based cost analysis and a decision matrix for picking the right model for each Turkish task. 35+ references.

The Context Engineering Era: Prompt Caching, Long Context vs RAG, and Runtime State Management (2026 Guide)

Prompt engineering is dead, context engineering is alive. Anthropic's 90% cost-cutting prompt caching, GPT-5.5's 272K input threshold, Claude Opus 4.7's 1M context, and agent runtime state management are rewriting AI engineering in 2026. Turkish token efficiency, KVKK-compliant state stores, the 'Don't Break the Cache' principle.

40 min

Sora vs Runway vs Kling 2026: Deep Turkish Comparison of AI Video Generation

Deep technical comparison of three main AI video generation platforms: OpenAI Sora 2 (ChatGPT Pro integrated, 20s HD), Runway Gen-4 (commercial standard, agency favorite), Kuaishou Kling AI 2.0 (Chinese leader, photoreal human). Plus alternatives: Luma Dream Machine, Pika 2.0, MiniMax Hailuo, Lightricks LTXVideo, Open-Sora, Veo 3 (Google), Mochi (Genmo). Architectures, duration, resolution, motion quality, prompt understanding, image-to-video, video-to-video, lip sync, character consistency, pricing, commercial rights, KVKK + Turkish copyright, 15 use cases, video prompt engineering, troubleshooting.

24 min

ChatGPT Free vs Plus vs Pro vs Team vs Enterprise 2026: Which Plan Should I Buy? A Detailed Comparison Guide

A detailed Turkish guide comparing all ChatGPT plans ($0 Free, $20 Plus, $200 Pro, $25/seat Team, custom Enterprise). 11 tables across model access, usage limits, features (Custom GPT, Sora, Voice, Operator, Deep Research, Code Interpreter), training-data policy, and KVKK compliance. Concrete recommendations across 8 user scenarios — individual professionals, freelancers, SMBs, enterprise buyers — plus Turkey payment and cancellation walkthroughs.

28 min

Claude Opus 4.7 vs GPT-5: Which is Better? — A 2026 Flagship Model Head-to-Head Comparison

A head-to-head comparison of the two 2026 flagship AI models — Anthropic Claude Opus 4.7 and OpenAI GPT-5. Architecture and training philosophy differences (Constitutional AI vs RLHF), benchmark results (MMLU, HumanEval, GSM8K, hallucination), Turkish performance, code generation, reasoning, long context (1M vs 256K), multimodal, agent/tool use/MCP, cost, latency, safety, and alignment. Use-case-based winner analysis.

30 min

ChatGPT vs Claude vs Gemini 2026: A Detailed Comparison of the Three AI Assistants — Which One is Right for You?

An end-to-end comparison of the 2026 versions of OpenAI ChatGPT, Anthropic Claude, and Google Gemini. Twelve comparison tables across model families, pricing, Turkish fluency, code generation, long context, multimodal capabilities, voice, video, computer use, custom assistants, agent/MCP support, data privacy, and KVKK compliance. Use-case-based decision matrix for Turkish individual users and enterprise buyers.

32 min

How to Use ChatGPT? A Comprehensive 2026 Guide — From Beginner to Advanced

A comprehensive Turkish guide to using ChatGPT from beginner to professional level. From signup to Plus/Pro plan comparison, building Custom GPTs to Vision/Voice/Operator features, 25 day-to-day use cases to KVKK-compliant enterprise use — everything Turkish users need to know about ChatGPT as of 2026.

28 min

Prompt Engineering: From Zero to Advanced — A Comprehensive 2026 Guide

A comprehensive Turkish guide that takes prompt engineering from zero to advanced. Covers the 6 components of a prompt, 14 core techniques (zero-shot, few-shot, CoT, ToT, ReAct, self-consistency, meta-prompting), Turkish-specific notes, 20+ ready templates, model-specific differences (GPT-5, Claude Opus 4.7, Gemini 3), prompt injection defenses, DSPy-based automatic optimization, and A/B testing.

30 min