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-5.1-Codex-Max
NVIDIA: Nemotron 3 Ultra wins on 3 of 6 axes — pricing and capability skew in its favour for most workloads.
GPT-5.1-Codex-Max is OpenAI’s latest agentic coding model, designed for long-running, high-context software development tasks. It is based on an updated version of the 5.1 reasoning stack and trained on agentic...
Model details →Side-by-side comparison
| Capability | NVIDIA: Nemotron 3 Ultra | OpenAI: GPT-5.1-Codex-Max | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 512K | 400K | 🏆 NVIDIA: Nemotron 3 Ultra |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $0.60 | $1.25 | 🏆 NVIDIA: Nemotron 3 Ultra |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $3.60 | $10.00 | 🏆 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-5.1-Codex-Max |
| Reasoning mode Internal chain-of-thought / extended-thinking support. | Yes | Yes | Tie |
Frequently asked questions
Is NVIDIA: Nemotron 3 Ultra better than OpenAI: GPT-5.1-Codex-Max?
NVIDIA: Nemotron 3 Ultra wins on 3 of 6 axes — pricing and capability skew in its favour for most workloads.
What's the price difference between NVIDIA: Nemotron 3 Ultra and OpenAI: GPT-5.1-Codex-Max?
Input: $0.60 vs $1.25 per 1M tokens. Output: $3.60 vs $10.00 per 1M tokens.
What context windows do NVIDIA: Nemotron 3 Ultra and OpenAI: GPT-5.1-Codex-Max support?
NVIDIA: Nemotron 3 Ultra supports up to 512K tokens. OpenAI: GPT-5.1-Codex-Max supports up to 400K tokens.
Do both NVIDIA: Nemotron 3 Ultra and OpenAI: GPT-5.1-Codex-Max support tool calling?
NVIDIA: Nemotron 3 Ultra: yes. OpenAI: GPT-5.1-Codex-Max: yes.
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