Compare AI models

Specifications
ParametersA rough measure of how big the model is. More parameters usually means more capable and more expensive to run, though it is a poor guide on its own — a smaller, newer model often beats a larger, older one.
253B2.4T
Context windowHow much text the model can hold in mind at once — your question, any documents you attach, the conversation so far, and its own reply. Go past it and the earliest part falls out of view.
—1M
These models have no shared benchmark scores.
Overview
CompanyNVIDIAQwen
Release dateApr 8 2025Sep 2 2026
AccessOpen WeightClosed
Model detailsView modelView model

Frequently asked questions

Llama Nemotron Ultra 253B and Qwen3.8-Max-0902 don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Llama Nemotron Ultra 253B shipped 512 days before Qwen3.8-Max-0902, so benchmark comparisons should account for the intervening progress.

Llama Nemotron Ultra 253B has 253B parameters, while Qwen3.8-Max-0902 has 2.4T. Llama Nemotron Ultra 253B is open weight, while Qwen3.8-Max-0902 is closed.

Direct benchmark comparisons are unavailable — Llama Nemotron Ultra 253B and Qwen3.8-Max-0902 don't publish scores on any of the same benchmarks.