GPT-4.5 vs Llama 4 Behemoth (preview)

GPT-4.5 (OpenAI) and Llama 4 Behemoth (preview) (Meta AI) are both frontier AI models. GPT-4.5 was published in February 2025 and Llama 4 Behemoth (preview) in April 2025.

GPT-4.5 was trained on 3.8×10²⁶ FLOP, about 7.3x the compute of Llama 4 Behemoth (preview) at 5.2×10²⁵ FLOP. Training compute is the closest available proxy for how much was invested in a model, though it says nothing on its own about how well that compute was spent.

These two models share no benchmark on which both have been scored, so no direct performance comparison is possible here. The specification table below is a comparison of inputs, not of results.