what are the top 5 most used LLMs?

Identifying the "top 5 most used" LLMs is difficult because usage data is rarely public or standardized across the industry. However, looking at current rankings and expert discussions from 2026, several models consistently appear at the forefront of the landscape.

Based on current industry tracking and professional adoption [3]:

1. GPT-6 Astra / GPT-5 family (OpenAI): These remain central to the industry, widely recognized for their frontier capabilities [3].
2. Claude Opus 5 / Claude (Anthropic): Anthropic’s models are highly regarded for data-heavy tasks, coding, and natural interaction, with users noting a significant shift toward their platform for professional workflows [2, 3].
3. Gemini 3 Pro (Google): As a primary offering from Google, this model maintains a major footprint in the ecosystem [3].
4. Grok 4 (xAI): Frequently cited as a leading model in current intelligence and performance rankings [3].
5. DeepSeek (V3 / R1): These models have gained substantial traction and are noted as key players in the 2026 landscape [3].

While these models are widely recognized for their performance, "most used" can shift quickly based on specific use cases—such as open-weights models like the Gemma 4 family [1] or other specialized systems. Because usage statistics are proprietary, there is no definitive, audited list of the five most used models worldwide.