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 released its newest flagship, which is more efficient and better at coding than GPT-5.4. Since May 5, 2026, GPT-5.5 Instant is also the new default chat model in ChatGPT and is available in Microsoft Foundry as gpt-chat-latest. On June 1, 2026, GPT-5.5, GPT-5.4, and Codex became generally available on Amazon Bedrock – a major step toward GDPR-compliant availability in EU regions. GPT-5.4 (March 2026) remains the API recommendation 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. Since April 24, 2026, GPT-5.5 is also available in the API ($5/1M input, $30/1M output, 1M context window).
GPT-5.5 Instant (May 2026)
On May 5, 2026, OpenAI introduced GPT-5.5 Instant as the new default chat model in ChatGPT, replacing GPT-5.3 Instant. In internal evaluations, GPT-5.5 Instant produces 52.5 percent fewer hallucinations than GPT-5.3 Instant on high-stakes prompts (medicine, law, finance). In the API it is available as chat-latest and in Microsoft Foundry as gpt-chat-latest – making it accessible for GDPR-compliant enterprise deployments in EU regions (depending on Foundry region configuration).
New Realtime Voice Models (May 2026)
On May 7, 2026, OpenAI introduced three new realtime voice models in the API:
- GPT-Realtime-2 – Voice model with GPT-5 reasoning, 128k token context window (up from 32k). Pricing: $32/1M audio in, $64/1M audio out.
- GPT-Realtime-Translate – Real-time live translation, 70+ input languages, 13 output languages. Pricing: $0.034/min.
- GPT-Realtime-Whisper – Live transcription (speech-to-text). Pricing: $0.017/min.
These models are well-suited for voice agents, conference translation, and real-time meeting notes.
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
As of June 2026: GPT models up to and including GPT-5.1 are available via Azure AI Foundry in EU regions. GPT-5.5 Instant is available in Microsoft Foundry as
gpt-chat-latest. GPT-5.5 and GPT-5.4 are generally available on Amazon Bedrock since June 1, 2026 – EU region coverage is being expanded.
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 GPT-5.x models are NOT yet broadly available in EU regions via Azure. Microsoft Foundry now lists GPT-5.5 Instant as gpt-chat-latest, which can be deployed in EU regions depending on Foundry availability.
NEW: OpenAI generally available on Amazon Bedrock (since June 1, 2026)
Since June 1, 2026, GPT-5.5, GPT-5.4, and Codex are generally available on Amazon Bedrock. As part of a strategic partnership between Amazon and OpenAI ($50B investment), AWS is the exclusive third-party cloud distribution provider for OpenAI Frontier models.
At GA launch, the models are available in US East (N. Virginia), US West (Oregon), and select EU regions – additional EU regions (in particular eu-central-1 Frankfurt) are rolling out throughout 2026. Once Frankfurt is fully supported, this opens a genuine alternative to Azure for GDPR-compliant deployment of the latest GPT models. We continuously verify EU region availability.
Integration with CompanyGPT
With CompanyGPT you can use GPT models GDPR-compliant in your company – without your data being used for training.
Our Recommendation
GPT-5.4 is technically the strongest generally available API model. For GDPR-compliant enterprise usage, we currently recommend the following options:
- GPT-5.5 Instant in Microsoft Foundry (
gpt-chat-latest) – best choice for chat workloads in EU regions. - GPT-5.1 via Azure AI Foundry – for use cases that require the classic GPT-5 family.
- GPT-5.5 / GPT-5.4 via Amazon Bedrock – GA since June 2026; EU region availability must be verified per project.
Once GPT-5.4/5.5 are fully available in Frankfurt (eu-central-1) on Bedrock, this will become the preferred option for GDPR-compliant frontier models. For specialized coding tasks, choose GPT-5.3 Codex (also GA on Bedrock); for fast, cost-sensitive applications, GPT-5.4 mini.