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gpt-oss-20b vs Nemotron 3 Ultra

Detailed technical comparison between gpt-oss-20b (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-oss-20b: 0 WinsvsNemotron 3 Ultra: 6 Wins
Context Leader

Nemotron 3 Ultra

512,288 tokens
Agentic Tool-Calling

Tie

Equal Capability
Lowest Latency (TTFT)

Tie

Equal Speed
Input Price Leader

gpt-oss-20b

$0.03 / MTok
OpenAIactive

gpt-oss-20b

gpt-oss-20b is an open-weight 21B parameter model released by OpenAI under the Apache 2.0 license. It uses a Mixture-of-Experts (MoE) architecture with 3.6B active parameters per forward pass, optimized for...

View gpt-oss-20b 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-oss-20bNemotron 3 Ultra
ProviderOpenAINvidia
Context Window131,072 tokens512,288 tokens🏆
Agent SuitabilityN/AN/A
Time to First Token (TTFT)N/AN/A
Deployment Modelmanaged apimanaged api
Production Stabilitystablebeta
API AvailableYesYes
Released Date2025-08-052026-06-04

API Pricing Comparison

Input Price per Million Tokens

gpt-oss-20b

$0.03

Nemotron 3 Ultra

$0.60

Output Price per Million Tokens

gpt-oss-20b

$0.13

Nemotron 3 Ultra

$3.60

💡 Cost Ratio: gpt-oss-20b is 20.0x cheaper per input token than Nemotron 3 Ultra.

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
79.8%vs87.8%+8.0% Nemotron 3 Ultra
gpt-oss-20b
Nemotron 3 Ultra 🏆
HumanEvalPython coding & logic synthesis
78.0%vs87.0%+9.0% Nemotron 3 Ultra
gpt-oss-20b
Nemotron 3 Ultra 🏆
MATHComplex mathematical problem solving
55.2%vs68.2%+13.0% Nemotron 3 Ultra
gpt-oss-20b
Nemotron 3 Ultra 🏆
GPQAGraduate-level expert reasoning
40.6%vs49.6%+9.0% Nemotron 3 Ultra
gpt-oss-20b
Nemotron 3 Ultra 🏆
HellaSwagCommonsense reasoning and inference
82.8%vs85.4%+2.6% Nemotron 3 Ultra
gpt-oss-20b
Nemotron 3 Ultra 🏆
MT-BenchMulti-turn conversation flow quality
8.5%vs9.1%+0.6% Nemotron 3 Ultra
gpt-oss-20b
Nemotron 3 Ultra 🏆

gpt-oss-20b Quirks & Gotchas

No developer gotchas reported.

Nemotron 3 Ultra Quirks & Gotchas

No developer gotchas reported.

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