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. With GPT-5.5 (April 2026), OpenAI has released its newest flagship, which is more efficient and better at coding than GPT-5.4. GPT-5.4 (March 2026) remains the recommended choice for API users with its 1 million token context window, native computer control, and 33 percent fewer hallucinations than GPT-5.2. For specialized coding tasks, GPT-5.3 Codex remains available, while the o-series with o3 and o4-mini covers complex reasoning tasks.
GPT-5.5 – The Latest Flagship
GPT-5.5 (April 23, 2026, codename “Spud”) is OpenAI’s newest model. It is more efficient than GPT-5.4 and offers improved coding capabilities. In addition to the base model, the GPT-5.5 Thinking and GPT-5.5 Pro variants are available.
At launch, GPT-5.5 is not available to free-tier users, and API access has been withheld for now – OpenAI has announced it will be enabled shortly once additional safeguards are in place. Since the model has only been available for one day, no detailed benchmarks have been published yet. We will update this page as more information becomes available.
GPT-5.4 – The Proven Flagship
GPT-5.4 (March 5, 2026) combines all key capabilities in a single model and sets new benchmarks across multiple domains:
Native Computer Use
GPT-5.4 can control desktop applications and browsers natively – a breakthrough for automating real-world workflows. Scoring 75 percent on the OSWorld-Verified benchmark, it surpasses the human baseline (72.4 percent) for GUI automation.
1 Million Token Context Window
With up to 1,050,000 tokens (922K input + 128K output), GPT-5.4 processes documents spanning thousands of pages – ideal for extensive contract analysis, code reviews, or research documents.
Tool Search
Instead of loading all tool definitions upfront, GPT-5.4 can dynamically search and use tools as needed. This reduces token costs in tool-heavy workflows by approximately 47 percent.
Model Variants
| Variant | Strength | Price (Input/1M tokens) |
|---|---|---|
| GPT-5.4 | All-round flagship | $2.50 |
| GPT-5.4 Pro | Deepest reasoning | $30.00 |
| GPT-5.4 mini | Fast tasks | Affordable |
| GPT-5.4 nano | Sub-agents & repetitive tasks | Very affordable |
GPT-5.3 Codex: Agentic Coding
GPT-5.3 Codex (February 2026) remains the specialized model for agentic coding. It was the first OpenAI model that helped build itself and delivers over 1,000 tokens per second in the Codex-Spark variant.
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 2 (Image Generation)
Latest image generation model from OpenAI:
- High-Fidelity: High-quality image output
- Image Editing: Modification of existing images
GDPR-Compliant Deployment in the EU
GPT models up to and including GPT-5.1 are available via Azure AI Foundry in multiple EU regions:
- West Europe (Netherlands) – EU Data Boundary
- Germany West Central (Frankfurt)
- Sweden Central
Microsoft guarantees that data does not leave the EU when configured accordingly. Enterprises benefit from SLAs, policy enforcement, and comprehensive compliance tools for GDPR conformity.
GPT-5.2 and newer models are NOT yet available in EU regions via Azure. Organizations requiring EU data residency should currently use GPT-5.1 or earlier via Azure.
NEW: OpenAI on Amazon Bedrock (Limited Preview)
As part of a strategic partnership between Amazon and OpenAI ($50B investment), GPT-5.5 and GPT-5.4 will be available on Amazon Bedrock. AWS will be the exclusive third-party cloud distribution provider for OpenAI Frontier models.
Once available in EU regions (e.g. Frankfurt/eu-central-1), this opens a new option for GDPR-compliant usage of the latest GPT models. The exact EU availability timeline is still to be determined.
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 EU-compliant enterprise usage, we currently recommend GPT-5.1 via Azure AI Foundry, as it is the latest model available in EU regions. GPT-5.4 and GPT-5.5 offer superior capabilities but are not yet available in the EU. Once GPT-5.4/5.5 become available via Amazon Bedrock in EU regions, they will be the preferred choice. For maximum precision on complex tasks, choose GPT-5.4 Pro (non-EU); for software development, GPT-5.3 Codex; and for fast, cost-sensitive applications, GPT-5.4 mini. We will update our recommendation as EU availability expands.