As an AI consulting firm based in Rosenheim, Germany, we help enterprises across the DACH region (Germany, Austria, Switzerland) integrate OpenAI models in a GDPR-compliant way. With our CompanyGPT you can run GPT models securely in your own infrastructure.
What is GPT?
GPT (Generative Pre-trained Transformer) is OpenAI’s model family. The current generation includes GPT-5.2 as the flagship model with a 400,000 token context window, specialized variants like GPT-5.3 Codex for agentic coding, and GPT-5 mini for cost-efficient applications. The o-series with o3 focuses on complex reasoning tasks. On February 13, 2026, GPT-4o, GPT-4.1, and o4-mini were removed from ChatGPT but remain available via API.
GPT-5.3 Codex: Agentic Coding at a New Level
With GPT-5.3 Codex (February 2026), OpenAI released a highly specialized model for agentic coding. The special feature: GPT-5.3 Codex was the first OpenAI model that helped build itself - it was used to debug and optimize its own code. With 25 percent higher speed than GPT-5.2 and over 1,000 tokens per second in the Codex-Spark variant, it is particularly suitable for software development, automated workflows, and real-time code generation.
Additional APIs
Realtime API
Real-time conversations with low latency:
- Speech-to-Speech: Natural conversations
- Text, Audio, Image: Multimodal inputs in real-time
Sora 2 (Video API)
Video generation and editing:
- Text-to-Video: Detailed, dynamic videos
- Portrait & Landscape: Various formats
GPT-image-1.5 (Image Generation)
Precise image generation and editing:
- High-Fidelity: High-quality image output
- Image Editing: Modification of existing images
Integration with CompanyGPT
With CompanyGPT you can use GPT models GDPR-compliant in your company - without your data being used for training.
Our Recommendation
For most enterprise applications, we recommend GPT-5.2 as the current default with balanced performance. For software development and agentic workflows, GPT-5.3 Codex is ideal; for cost-sensitive use cases, GPT-5 mini is a strong choice; for high-precision analysis, GPT-5.2 pro excels; and for complex reasoning tasks, use o3. GPT-4o, GPT-4.1, and o4-mini were removed from ChatGPT on February 13, 2026, and should be replaced with newer versions in the medium term.