GPT-5.5 Pro vs Nemotron 3 Ultra
Detailed technical comparison between GPT-5.5 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.
Comparison Snapshot
GPT-5.5 Pro
1,050,000 tokensTie
Equal CapabilityTie
Equal SpeedNemotron 3 Ultra
$0.60 / MTokGPT-5.5 Pro
GPT-5.5 Pro is OpenAI’s high-capability model optimized for deep reasoning and accuracy on complex, high-stakes workloads. It features a 1M+ token context window (922K input, 128K output) with support for...
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 | GPT-5.5 Pro | Nemotron 3 Ultra |
|---|---|---|
| Provider | OpenAI | Nvidia |
| Context Window | 1,050,000 tokens🏆 | 512,288 tokens |
| Agent Suitability | 98/100 | N/A |
| Time to First Token (TTFT) | 450 ms | N/A |
| Deployment Model | managed api | managed api |
| Production Stability | beta | beta |
| API Available | Yes | Yes |
| Released Date | 2026-04-24 | 2026-06-04 |
API Pricing Comparison
Input Price per Million Tokens
GPT-5.5 Pro
$30.00
Nemotron 3 Ultra
$0.60
Output Price per Million Tokens
GPT-5.5 Pro
$180.00
Nemotron 3 Ultra
$3.60
💡 Cost Ratio: Nemotron 3 Ultra is 50.0x cheaper per input token than GPT-5.5 Pro.
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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.
GPT-5.5 Pro Quirks & Gotchas
- ▸Best-in-class instruction following for complex agentic chains
- ▸Premium pricing — use GPT-5 for cost-sensitive workloads
Nemotron 3 Ultra Quirks & Gotchas
No developer gotchas reported.
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