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GPT-5.6 Terra Pro vs Nemotron 3 Ultra

Detailed technical comparison between GPT-5.6 Terra Pro (OpenAI) 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

GPT-5.6 Terra Pro: 6 WinsvsNemotron 3 Ultra: 0 Wins
Context Leader

GPT-5.6 Terra Pro

1,050,000 tokens
Agentic Tool-Calling

Tie

Equal Capability
Lowest Latency (TTFT)

Tie

Equal Speed
Input Price Leader

Nemotron 3 Ultra

$0.50 / MTok
OpenAIactive

GPT-5.6 Terra Pro

GPT-5.6 Terra Pro is the same underlying model as [GPT-5.6 Terra](https://openrouter.ai/openai/gpt-5.6-terra), served with `reasoning.mode` set to `pro` for higher-quality responses on complex tasks. Learn more in OpenAI's docs: https://developers.openai.com/api/docs/guides/reasoning#reasoning-mode

View GPT-5.6 Terra Pro 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
SpecificationGPT-5.6 Terra ProNemotron 3 Ultra
ProviderOpenAINvidia
Context Window1,050,000 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 Date2026-07-092026-06-04

API Pricing Comparison

Input Price per Million Tokens

GPT-5.6 Terra Pro

$2.50

Nemotron 3 Ultra

$0.50

Output Price per Million Tokens

GPT-5.6 Terra Pro

$15.00

Nemotron 3 Ultra

$2.20

💡 Cost Ratio: Nemotron 3 Ultra is 5.0x cheaper per input token than GPT-5.6 Terra Pro.

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
90.8%vs87.8%+3.0% GPT-5.6 Terra Pro
GPT-5.6 Terra Pro 🏆
Nemotron 3 Ultra
HumanEvalPython coding & logic synthesis
92.0%vs87.0%+5.0% GPT-5.6 Terra Pro
GPT-5.6 Terra Pro 🏆
Nemotron 3 Ultra
MATHComplex mathematical problem solving
79.2%vs68.2%+11.0% GPT-5.6 Terra Pro
GPT-5.6 Terra Pro 🏆
Nemotron 3 Ultra
GPQAGraduate-level expert reasoning
57.6%vs49.6%+8.0% GPT-5.6 Terra Pro
GPT-5.6 Terra Pro 🏆
Nemotron 3 Ultra
HellaSwagCommonsense reasoning and inference
89.8%vs85.4%+4.4% GPT-5.6 Terra Pro
GPT-5.6 Terra Pro 🏆
Nemotron 3 Ultra
MT-BenchMulti-turn conversation flow quality
9.2%vs9.1%+0.1% GPT-5.6 Terra Pro
GPT-5.6 Terra Pro 🏆
Nemotron 3 Ultra

GPT-5.6 Terra Pro Quirks & Gotchas

No developer gotchas reported.

Nemotron 3 Ultra Quirks & Gotchas

No developer gotchas reported.

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