AI model comparison
Nemotron 3 Ultra vs Grok 4.3
Pricing, context window, benchmarks, and features compared side by side. Or skip the guesswork and send one prompt to both.
NVIDIA
Nemotron 3 Ultra
NVIDIA Nemotron 3 Ultra is an open frontier-reasoning and orchestration model from NVIDIA, with 55B active parameters out of 550B total (MoE).
- Input / 1M
- $0.50
- Output / 1M
- $2.20
- Context
- 262K
At a glance
Quick verdict
How the two models stack up on the things people ask about most.
Lower price
Nemotron 3 Ultra
1.8x cheaper for a typical chat
Higher intelligence score
Grok 4.3
24.9 vs 22.9 on Artificial Analysis
Larger context window
Grok 4.3
1M vs 262K tokens
Newer release
Nemotron 3 Ultra
Released June 4, 2026
Benchmarks
Benchmark scores
Independent scores from Artificial Analysis. Higher is better.
Intelligence index
Coding index
Agentic index
Pricing
Nemotron 3 Ultra vs Grok 4.3 API pricing
Per-token API rates. Cheaper option highlighted.
| Metric | ||
|---|---|---|
| Input tokensPer 1M tokens | $0.50 | $1.25 |
| Output tokensPer 1M tokens | $2.20 | $2.50 |
| Cached input (read)Per 1M tokens | $0.10 | $0.20 |
| Cache writePer 1M tokens | Not available | Not available |
| Long-context pricingPer 1M tokens, for very long prompts | Same rate at any length | $2.50 in / $5 out above 200K |
| Web searchPer request | Not available | $0.005 |
What it costs in practice
Estimated cost per 1,000 requests at standard rates. Coding and long-document figures also show the cost when the input is already cached.
Chat message
2K in, 500 out
Coding task
30K in, 4K out
Long document summary
150K in, 2K out
Specs
Context window and capabilities
How much each model can read, how much it can write, and what it accepts as input.
| Metric | ||
|---|---|---|
| Context window | 262K tokens | 1M tokens |
| Max output | 16K tokens | 900K tokens |
| Input types | Text | File, Image, Text |
| Output types | Text | Text |
| Reasoning effort levels | High, Medium | High, Medium, Low, None |
| Default reasoning effort | High | Low |
| Release date | June 4, 2026 | April 30, 2026 |
Features
Supported features
API features available for each model.
| Metric | ||
|---|---|---|
| Tool calling | Supported | Supported |
| Structured outputs | Supported | Supported |
| JSON mode | Supported | Supported |
| Reasoning | Supported | Supported |
| Temperature | Supported | Supported |
| Stop sequences | Supported | Not supported |
| Deterministic seed | Supported | Supported |
| Verbosity control | Not supported | Not supported |
Keep exploring
More on these models
Other head-to-heads, the full model page, and the alternatives list for each model.
- Nemotron 3 Ultra vs DeepSeek V4 Flash 0423
- Nemotron 3 Ultra vs Gemini 3 Flash Preview
- Nemotron 3 Ultra vs GPT-5.4 Mini
- Nemotron 3 Ultra vs Kimi K2.5
- Nemotron 3 Ultra vs Qwen3.5-27B
- Nemotron 3 Ultra vs MiniMax M2.5
- Nemotron 3 Ultra vs Gemini 3.5 Flash Lite
- Nemotron 3 Ultra vs GLM 4.7
- Nemotron 3 Ultra vs Kimi K2 Thinking
- Nemotron 3 Ultra vs Qwen3.6 27B
- Nemotron 3 Ultra vs GPT-5 Mini
- Nemotron 3 Ultra vs GPT-5.1-Codex-Mini
- Grok 4.3 vs Grok Build 0.1
- Grok 4.3 vs Kimi K2.6
- Grok 4.3 vs DeepSeek V4 Flash 0423
- Grok 4.3 vs Gemini 3 Flash Preview
- Grok 4.3 vs GLM 5.1
- Grok 4.3 vs Kimi K2.7 Code
- Grok 4.3 vs Grok 4.20
- Grok 4.3 vs Qwen3.7 Plus
- Grok 4.3 vs Inkling
- Grok 4.3 vs GPT-5.4 Mini
- Grok 4.3 vs Kimi K2.5
- Grok 4.3 vs Qwen3.5-27B
- Grok 4.3 vs Gemini 3.5 Flash Lite
Our take
Nemotron 3 Ultra is 1.8x cheaper for a typical chat. Grok 4.3 scores higher on the Artificial Analysis Intelligence Index (24.9 vs 22.9). Grok 4.3 has the larger context window (1M vs 262K tokens). The right pick depends on your workload, so the quickest way to settle it is to send the same prompt to both and compare.
FAQ
Frequently asked questions
Is Nemotron 3 Ultra or Grok 4.3 cheaper?
Nemotron 3 Ultra is cheaper for a typical chat (2K input tokens and 500 output tokens). Nemotron 3 Ultra costs $0.50 per 1M input tokens and $2.20 per 1M output tokens, while Grok 4.3 costs $1.25 per 1M input tokens and $2.50 per 1M output tokens.
Which has a bigger context window, Nemotron 3 Ultra or Grok 4.3?
Grok 4.3 supports up to 1M tokens of context, compared with 262K for Nemotron 3 Ultra.
Is Nemotron 3 Ultra smarter than Grok 4.3?
On the Artificial Analysis Intelligence Index, Nemotron 3 Ultra scores 22.9 and Grok 4.3 scores 24.9, putting Grok 4.3 ahead. Benchmarks don't capture everything, so the best test is running your own prompts through both.
Can I use Nemotron 3 Ultra and Grok 4.3 at the same time?
Yes. Shortcut Chat sends one prompt to multiple models at once, so you can see Nemotron 3 Ultra and Grok 4.3 answer side by side and keep the better response.
Why choose? Ask both.
Send one prompt to Nemotron 3 Ultra and Grok 4.3 at the same time. Compare the answers side by side and keep the best one.