OpenAI's latest flagship model is **GPT-4o**.

Announced on May 13, 2024, GPT-4o is a significant step forward from previous models. The "o" in its name stands for **"omni,"** highlighting its native ability to understand and generate a combination of text, audio, and vision in real time.

Here are the key features that make it the new flagship:

1.  **True Multimodality:** Unlike previous models that processed different inputs (like images) separately, GPT-4o was designed from the ground up to handle text, audio, and vision seamlessly through a single neural network. This allows for much more natural and human-like interactions.
2.  **Speed and Performance:** It matches the intelligence of GPT-4 Turbo but is significantly faster. This speed is especially noticeable in real-time voice conversations, where it can respond almost instantly.
3.  **Cost-Effectiveness:** For developers using the API, GPT-4o is much cheaper than GPT-4 Turbo, making advanced AI capabilities more accessible.
4.  **Accessibility:** In a major shift, OpenAI is making GPT-4o's capabilities available to **free ChatGPT users**, not just Plus subscribers. This means free users now have access to a GPT-4-level model.

In short, **GPT-4o** has replaced GPT-4 Turbo as OpenAI's most advanced, fastest, and most accessible model.
