Kimi K3 vs Nvidia Nemotron 3 Ultra 550B A55b
API pricing, context window and capabilities for Kimi K3 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 numbersKimi K3 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
Kimi K3
Intelligence
Kimi K3
Context window
Kimi K3
Key takeaways
who wins on what, from the published numbersKimi K3 wins
- Larger context window (1M vs 262K)
- Higher max output (1M vs 203K)
- More serving providers (14 vs 3)
Nvidia Nemotron 3 Ultra 550B A55b wins
- Cheaper input ($0.70 vs $0.50 /1M)
- Cheaper output ($12.50 vs $2.15 /1M)
Cheaper overall
Nvidia Nemotron 3 Ultra 550B A55b
$0.50 + $2.15 /1M
Larger context
Kimi K3
1M
More providers
Kimi K3
14 providers
Pricing & specs
cheapest listed route · per 1M tokensOn-demand listed rates, OpenRouter routed quotes and Vercel reseller quotes. Enterprise commitments can be materially lower. An OpenRouter routed quote is the price of whichever upstream provider OpenRouter prefers today, so it moves day to day.
| Kimi K3 | Nvidia Nemotron 3 Ultra 550B A55b | |
|---|---|---|
| Input $/1M | $0.70OpenRouter routed quote | $0.50via DeepInfra best |
| Output $/1M | $12.50via Sail | $2.15via Wandb best |
| Context window | 1M best | 262K |
| Max output | 1M best | 203K |
| Serving providers | 14 best | 3 |
| Date | Released Jul 16, 2026 | Released Jun 4, 2026 |
Benchmarks
Benchmark scores, side by side| Kimi K3 | Nvidia Nemotron 3 Ultra 550B A55b | |
|---|---|---|
| Intelligence | 43.6 best | 22.9 |
| Terminal-Bench | 85% best | 54% |
| GPQA Diamond | 94% best | 87% |
| Output speed | 45 t/s | 166 t/s best |
| Latency (TTFT) | 3.17s | 1.12s best |
Cost calculator
choose a serving route for each sideInput tokens / month
Output tokens / month
Kimi K3
via OpenRouter
$19
Nvidia Nemotron 3 Ultra 550B A55b
via DeepInfra
$4.70
Capabilities
feature support, side by side| Feature | Kimi K3 | 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, Kimi K3 or Nvidia Nemotron 3 Ultra 550B A55b?
Nvidia Nemotron 3 Ultra 550B A55b is cheaper for input ($0.70 vs $0.50 per 1M tokens) from DeepInfra. Nvidia Nemotron 3 Ultra 550B A55b is cheaper for output ($12.50 vs $2.15 per 1M tokens) from Wandb.
What is the context window difference between Kimi K3 and Nvidia Nemotron 3 Ultra 550B A55b?
Kimi K3 has a 1M-token context window and Nvidia Nemotron 3 Ultra 550B A55b has 262K tokens, so Kimi K3 can take a larger prompt.
How do Kimi K3 and Nvidia Nemotron 3 Ultra 550B A55b compare on benchmarks?
On the tracked benchmarks, Kimi K3 leads on Terminal-Bench, and Kimi K3 leads on intelligence.
Listed prices from LiteLLM, OpenRouter and Vercel · last checked Oct 14, 2026
Every weekday
AI moves fast. Here's your debrief.
News, analysis, tools, and more.
For people who build with AI