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Grok 4.20 vs Nemotron 3 Ultra

Detailed technical comparison between Grok 4.20 (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.

⚡ Executive Summary & Verdict

Comparison Snapshot

Grok 4.20: 0 WinsvsNemotron 3 Ultra: 6 Wins
Context Leader

Grok 4.20

2,000,000 tokens
Agentic Tool-Calling

Tie

Equal Capability
Lowest Latency (TTFT)

Tie

Equal Speed
Input Price Leader

Nemotron 3 Ultra

$0.50 / MTok
xAIactive

Grok 4.20

Grok 4.20 is a reasoning model from xAI with industry-leading speed and agentic tool calling capabilities. It combines the lowest hallucination rate on the market with strict prompt adherance, delivering...

View Grok 4.20 Full Specs →
Nvidiaactive

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...

View Nemotron 3 Ultra Full Specs →

Technical Specifications

🏆 = Superior Spec
SpecificationGrok 4.20Nemotron 3 Ultra
ProviderxAINvidia
Context Window2,000,000 tokens🏆512,288 tokens
Agent SuitabilityN/AN/A
Time to First Token (TTFT)N/AN/A
Deployment Modelmanaged apimanaged api
Production Stabilitybetabeta
API AvailableYesYes
Released Date2026-03-312026-06-04

API Pricing Comparison

Input Price per Million Tokens

Grok 4.20

$1.25

Nemotron 3 Ultra

$0.50

Output Price per Million Tokens

Grok 4.20

$2.50

Nemotron 3 Ultra

$2.20

💡 Cost Ratio: Nemotron 3 Ultra is 2.5x cheaper per input token than Grok 4.20.

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.

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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.

MMLUGeneral knowledge & multi-task understanding
81.0%vs87.8%+6.8% Nemotron 3 Ultra
Grok 4.20
Nemotron 3 Ultra 🏆
HumanEvalPython coding & logic synthesis
79.2%vs87.0%+7.8% Nemotron 3 Ultra
Grok 4.20
Nemotron 3 Ultra 🏆
MATHComplex mathematical problem solving
56.4%vs68.2%+11.8% Nemotron 3 Ultra
Grok 4.20
Nemotron 3 Ultra 🏆
GPQAGraduate-level expert reasoning
38.4%vs49.6%+11.2% Nemotron 3 Ultra
Grok 4.20
Nemotron 3 Ultra 🏆
HellaSwagCommonsense reasoning and inference
80.6%vs85.4%+4.8% Nemotron 3 Ultra
Grok 4.20
Nemotron 3 Ultra 🏆
MT-BenchMulti-turn conversation flow quality
8.7%vs9.1%+0.5% Nemotron 3 Ultra
Grok 4.20
Nemotron 3 Ultra 🏆

Grok 4.20 Quirks & Gotchas

No developer gotchas reported.

Nemotron 3 Ultra Quirks & Gotchas

No developer gotchas reported.

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