GPT-4 – OpenAI's Most Advanced Language Model

GPT-4 (Generative Pre-trained Transformer 4) is OpenAI's most advanced language model, which can be integrated into custom applications via the OpenAI API. Unlike ChatGPT (the chat interface), GPT-4 is a programming interface for developers.

GPT-4 Model Variants

• GPT-4o ("omni"): Current flagship model. Faster and cheaper than GPT-4 Turbo, with native multimodality (text, image, audio).
• GPT-4 Turbo: Predecessor to GPT-4o. 128k token context window, lower prices than original GPT-4.
• GPT-4o-mini: Cost-efficient variant for simpler tasks. Replaces GPT-3.5 Turbo.
• o1 / o1-mini: New "reasoning" models for complex logic and mathematics.

Pricing Structure (as of 2025)

OpenAI bills per token (approx. 750 words = 1,000 tokens):

• GPT-4o: $2.50 / 1M input tokens, $10.00 / 1M output tokens
• GPT-4o-mini: $0.15 / 1M input, $0.60 / 1M output
• GPT-4 Turbo: $10.00 / 1M input, $30.00 / 1M output

For most use cases, we recommend GPT-4o as the optimal price-to-performance ratio.

API vs. ChatGPT: What Makes Sense for Businesses?

• ChatGPT Plus: $20/month for individual users. Simple, but no integration possible.
• GPT-4 API: Usage-based. Full control, custom UI, data integration, GDPR measures.
• ChatGPT Enterprise: Team version with admin control, but limited customization.

Elasticbrains Usage

We integrate GPT-4 into client-specific solutions:

• Chat Assistants: GPT-4o as the default LLM for customer service and internal bots
• Document Processing: Classification, extraction, summarization
• Voice AI: OpenAI Realtime API for real-time voice applications
• Workflow Automation: GPT-4 in n8n workflows for intelligent processing

GDPR Note

OpenAI is a US provider. For GDPR-compliant usage, we recommend:

• PII Filtering: Local removal of personal data before the API call
• Azure OpenAI: GPT-4 in EU data centers with enterprise SLAs
• Data Processing Agreement: Sign a DPA with OpenAI