Grok 4.5 vs Nvidia Nemotron 3 Ultra 550B A55b
API pricing, context window and capabilities for Grok 4.5 and Nvidia Nemotron 3 Ultra 550B A55b, side by side. Prices are the cheapest listed serving route per 1M tokens, from LiteLLM and OpenRouter.
Verdict
computed from the published numbersGrok 4.5 wins on Terminal-Bench, on intelligence and on context window. Nvidia Nemotron 3 Ultra 550B A55b wins on price.
Price
Nvidia Nemotron 3 Ultra 550B A55b
Terminal-Bench
Grok 4.5
Intelligence
Grok 4.5
Context window
Grok 4.5
Key takeaways
who wins on what, from the published numbersGrok 4.5 wins
- Larger context window (500K vs 262K)
- Higher max output (500K vs 203K)
- Has web search
Nvidia Nemotron 3 Ultra 550B A55b wins
- Cheaper input ($2.00 vs $0.50 /1M)
- Cheaper output ($6.00 vs $2.15 /1M)
Cheaper overall
Nvidia Nemotron 3 Ultra 550B A55b
$0.50 + $2.15 /1M
Larger context
Grok 4.5
500K
More providers
Tied
Pricing & specs
cheapest listed route · per 1M tokensOn-demand listed rates, OpenRouter routed quotes and Vercel reseller quotes. Enterprise commitments can be materially lower.
| Grok 4.5 | Nvidia Nemotron 3 Ultra 550B A55b | |
|---|---|---|
| Input $/1M | $2.00via xAI | $0.50via DeepInfra best |
| Output $/1M | $6.00via xAI | $2.15via Wandb best |
| Context window | 500K best | 262K |
| Max output | 500K best | 203K |
| Serving providers | 3 | 3 |
| Date | Released Jul 7, 2026 | Released Jun 4, 2026 |
Benchmarks
Benchmark scores, side by side| Grok 4.5 | Nvidia Nemotron 3 Ultra 550B A55b | |
|---|---|---|
| Intelligence | 38.8 best | 22.9 |
| Terminal-Bench | 82% best | 54% |
| GPQA Diamond | 93% best | 87% |
| Output speed | 63 t/s | 166 t/s best |
| Latency (TTFT) | 13.52s | 1.12s best |
Cost calculator
choose a serving route for each sideInput tokens / month
Output tokens / month
Grok 4.5
via OpenRouter
$16
Nvidia Nemotron 3 Ultra 550B A55b
via DeepInfra
$4.70
Capabilities
feature support, side by side| Feature | Grok 4.5 | Nvidia Nemotron 3 Ultra 550B A55b |
|---|---|---|
| Vision | ✓ | ✓ |
| Tool use | ✓ | ✓ |
| Reasoning | ✓ | ✓ |
| Audio | — | — |
| Prompt caching | ✓ | ✓ |
| Structured output | ✓ | ✓ |
| Web search | ✓ | — |
Related comparisons
Frequently asked questions
Which is cheaper, Grok 4.5 or Nvidia Nemotron 3 Ultra 550B A55b?
Nvidia Nemotron 3 Ultra 550B A55b is cheaper for input ($2.00 vs $0.50 per 1M tokens) from DeepInfra. Nvidia Nemotron 3 Ultra 550B A55b is cheaper for output ($6.00 vs $2.15 per 1M tokens) from Wandb.
What is the context window difference between Grok 4.5 and Nvidia Nemotron 3 Ultra 550B A55b?
Grok 4.5 has a 500K-token context window and Nvidia Nemotron 3 Ultra 550B A55b has 262K tokens, so Grok 4.5 can take a larger prompt.
How do Grok 4.5 and Nvidia Nemotron 3 Ultra 550B A55b compare on benchmarks?
On the tracked benchmarks, Grok 4.5 leads on Terminal-Bench, and Grok 4.5 leads on intelligence.
Listed prices from LiteLLM, OpenRouter and Vercel · last checked Oct 14, 2026
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