OpenAI compatible API · Attested · Public status
NVIDIA: Nemotron 3 Ultra vs OpenAI: gpt-oss-20b
Compare NVIDIA: Nemotron 3 Ultra and OpenAI: gpt-oss-20b by providers, context, price, and TrustedRouter route support.
Onebase URL to migrate
100sof models and routes
0prompt or output logs. Always.
Compare routesProviders, price, context, and policy posture in one view.
Use auto when uptime mattersKeep a primary model and let fallback handle provider failures.
Same API shapeUse the OpenAI client and set the model you want.
Practical read
OpenAI: gpt-oss-20b has the lower cheapest prompt+completion route on TrustedRouter. OpenAI: gpt-oss-20b has more provider fallback routes, while NVIDIA: Nemotron 3 Ultra has the larger context window. Probe-backed speed data is shown when enough recent samples exist.
$3.15/1MNVIDIA: Nemotron 3 Ultra cheapest route
$0.1785/1MOpenAI: gpt-oss-20b cheapest route
not enough dataNVIDIA: Nemotron 3 Ultra measured p50 TTFT
not enough dataOpenAI: gpt-oss-20b measured p50 TTFT
NVIDIA: Nemotron 3 UltraOpenAI: gpt-oss-20b
Model id
nvidia/nemotron-3-ultra-550b-a55bopenai/gpt-oss-20b
PublisherTogetherOpenAI
Context512,288 tokens131,072 tokens
Provider routes714
Cheapest route$3.15/1M$0.1785/1M
Privacy posturehas ZDR routehas ZDR route
Modes
chat
chat
NVIDIA: Nemotron 3 Ultra routes
Production choice
Pick a default model. Keep fallback enabled.
TrustedRouter is useful when you know the model you want, but still need provider rollover, budget limits, usage records, and a prompt path you can verify.
OpenAI clientPython
client = OpenAI(
base_url="https://gchircrcif.eu-west-3.awsapprunner.com/v1",
api_key="sk-tr-v1-..."
)
response = client.chat.completions.create(
model="nvidia/nemotron-3-ultra-550b-a55b",
messages=messages,
)