Grok 4.3 vs Nemotron 3 Ultra
Detailed technical comparison between Grok 4.3 (xAI) and Nemotron 3 Ultra (Nvidia). Review live API token pricing, context window capabilities, time-to-first-token latency, and verified benchmark scores side-by-side.
Comparison Snapshot
Grok 4.3
1,000,000 tokensTie
Equal CapabilityTie
Equal SpeedNemotron 3 Ultra
$0.50 / MTokGrok 4.3
Grok 4.3 is a reasoning model from xAI. It accepts text and image inputs with text output, and is suited for agentic workflows, instruction-following tasks, and applications requiring high factual...
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). Built on a hybrid Transformer-Mamba mixture-of-experts architecture, it...
Technical Specifications
🏆 = Superior Spec| Specification | Grok 4.3 | Nemotron 3 Ultra |
|---|---|---|
| Provider | xAI | Nvidia |
| Context Window | 1,000,000 tokens🏆 | 512,288 tokens |
| Agent Suitability | 87/100 | N/A |
| Time to First Token (TTFT) | 400 ms | N/A |
| Deployment Model | managed api | managed api |
| Production Stability | stable | beta |
| API Available | Yes | Yes |
| Released Date | 2026-04-30 | 2026-06-04 |
API Pricing Comparison
Input Price per Million Tokens
Grok 4.3
$1.25
Nemotron 3 Ultra
$0.50
Output Price per Million Tokens
Grok 4.3
$2.50
Nemotron 3 Ultra
$2.20
💡 Cost Ratio: Nemotron 3 Ultra is 2.5x cheaper per input token than Grok 4.3.
Want to test both models live?
Run side-by-side prompt benchmarks in our dynamic multi-model Sandbox. Compare execution speeds, latency metrics, and compute actual costs in real-time.
Benchmark Performance Metrics
Standardized Scores (0–100%)Scores show verified raw accuracy percentages across standardized AI evaluation suites. Higher bars indicate superior performance in that domain.
Grok 4.3 Quirks & Gotchas
- ▸Strong coding performance — competitive with Claude Sonnet at similar price point
- ▸Upgrade to Grok 4.20 for improved reasoning and tool calling
Nemotron 3 Ultra Quirks & Gotchas
No developer gotchas reported.
Explore Other Popular Comparisons
Grok 4.3 vs Nano Banana 2 (Gemini 3.1 Flash Image)
Compare context windows, live API token prices, and benchmark scores.
SIDE-BY-SIDE REVIEWGrok 4.3 vs GLM 4.7 Flash
Compare context windows, live API token prices, and benchmark scores.
SIDE-BY-SIDE REVIEWGrok 4.3 vs GLM 5.2
Compare context windows, live API token prices, and benchmark scores.
SIDE-BY-SIDE REVIEWGrok 4.3 vs GPT-5.2-Codex
Compare context windows, live API token prices, and benchmark scores.
SIDE-BY-SIDE REVIEWGrok 4.3 vs DeepSeek V3.1
Compare context windows, live API token prices, and benchmark scores.
SIDE-BY-SIDE REVIEWGrok 4.3 vs Mistral Medium 3.1
Compare context windows, live API token prices, and benchmark scores.