NVIDIA Nemotron 3 Ultra is an open frontier-reasoning and orchestration model from NVIDIA, with 55B active parameters out of 550B total (MoE). Built on a hybrid Transformer-Mamba mixture-of-experts architecture, it...
Model details →NVIDIA: Nemotron 3 Ultra vs OpenAI: GPT-5 Codex (batch)
NVIDIA: Nemotron 3 Ultra and OpenAI: GPT-5 Codex (batch) are evenly matched on 6 axes — pick the one whose provider, latency, or licensing fits your stack.
GPT-5-Codex is a specialized version of GPT-5 optimized for software engineering and coding workflows. It is designed for both interactive development sessions and long, independent execution of complex engineering tasks....
Model details →Side-by-side comparison
| Capability | NVIDIA: Nemotron 3 Ultra | OpenAI: GPT-5 Codex (batch) | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 262K | 400K | 🏆 OpenAI: GPT-5 Codex (batch) |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $0.60 | $0.63 | 🏆 NVIDIA: Nemotron 3 Ultra |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $2.40 | $5.00 | 🏆 NVIDIA: Nemotron 3 Ultra |
| Tool / function calling First-class support for emitting structured tool calls. | Yes | Yes | Tie |
| Vision input Accepts image inputs alongside text. | — | Yes | 🏆 OpenAI: GPT-5 Codex (batch) |
| Reasoning mode Internal chain-of-thought / extended-thinking support. | Yes | Yes | Tie |
Frequently asked questions
Is NVIDIA: Nemotron 3 Ultra better than OpenAI: GPT-5 Codex (batch)?
NVIDIA: Nemotron 3 Ultra and OpenAI: GPT-5 Codex (batch) are evenly matched on 6 axes — pick the one whose provider, latency, or licensing fits your stack.
What's the price difference between NVIDIA: Nemotron 3 Ultra and OpenAI: GPT-5 Codex (batch)?
Input: $0.60 vs $0.63 per 1M tokens. Output: $2.40 vs $5.00 per 1M tokens.
What context windows do NVIDIA: Nemotron 3 Ultra and OpenAI: GPT-5 Codex (batch) support?
NVIDIA: Nemotron 3 Ultra supports up to 262K tokens. OpenAI: GPT-5 Codex (batch) supports up to 400K tokens.
Do both NVIDIA: Nemotron 3 Ultra and OpenAI: GPT-5 Codex (batch) support tool calling?
NVIDIA: Nemotron 3 Ultra: yes. OpenAI: GPT-5 Codex (batch): yes.