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NVIDIA: Nemotron 3 Ultra vs OpenAI: GPT-5.6 Luna

Try both on us. Starter credit covers your first requests, then one key routes Nemotron 3 Ultra and GPT-5.6 Luna. Switch by changing the model name.

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

Monthly evidence

NVIDIA: Nemotron 3 Ultra has more Credits provider routes. GPT-5.6 Luna has the lower published input-plus-output rate and the larger context window. There is not enough recent probe data to compare speed.

$2.79575/1MNVIDIA: Nemotron 3 Ultra cheapest route

$1.477/1MOpenAI: GPT-5.6 Luna cheapest route

not enough dataNVIDIA: Nemotron 3 Ultra fastest measured p50 TTFT

not enough dataOpenAI: GPT-5.6 Luna fastest measured p50 TTFT

The price comparison adds each route's rate for one million input tokens and one million output tokens; your cost depends on your input/output mix. Prices and live route measurements can change. Use the monthly reports when you need a stable evidence window, then run a small task-specific eval before choosing a production default.

NVIDIA: Nemotron 3 UltraOpenAI: GPT-5.6 Luna

Model idnvidia/nemotron-3-ultra-550b-a55bopenai/gpt-5.6-luna

PublisherNVIDIA OpenAI

AI IQ — IQ 124#29

Context262,144 tokens1,050,000 tokens

Credits provider routes53

Cheapest route$2.79575/1M$1.477/1M

Cached input$0.1055/1M to $0.1266/1M$0.0211/1M

Privacy posturehas ZDR routehas ZDR route

Fastest measured p50 TTFTnot enough datanot enough data

Highest measured throughputnot enough datanot enough data

Recent route uptime rangenot enough datanot enough data

Modes chat chat

NVIDIA: Nemotron 3 Ultra routes

Overview5 Credits routes
PricingInput, cached input, and output rates
ProvidersAll serving providers

OpenAI: GPT-5.6 Luna routes

Overview3 Credits routes
PricingInput, cached input, and output rates
ProvidersAll serving providers

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OpenAI: GPT-5.6 Luna vs Z.ai: GLM 5.336 combined provider routes
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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://api-azure.trustedrouter.com/v1",
    api_key="sk-tr-v1-..."
)

response = client.chat.completions.create(
    model="nvidia/nemotron-3-ultra-550b-a55b",
    messages=messages,
)

Questions

Which should I use, NVIDIA: Nemotron 3 Ultra or OpenAI: GPT-5.6 Luna?

Is NVIDIA: Nemotron 3 Ultra or OpenAI: GPT-5.6 Luna cheaper?

The current cheapest TrustedRouter route is $2.79575/1M for NVIDIA: Nemotron 3 Ultra and $1.477/1M for OpenAI: GPT-5.6 Luna. The comparison uses current catalog prices and updates as provider pricing changes.

Is NVIDIA: Nemotron 3 Ultra or OpenAI: GPT-5.6 Luna faster?

Current measured p50 time to first token is not enough data for NVIDIA: Nemotron 3 Ultra and not enough data for OpenAI: GPT-5.6 Luna. These are routed probe measurements, not vendor-advertised speeds, and update as new samples arrive.

Can I test NVIDIA: Nemotron 3 Ultra and OpenAI: GPT-5.6 Luna with the same API?

Yes. Use the same OpenAI-compatible TrustedRouter base URL and API key, then change only the model id between nvidia/nemotron-3-ultra-550b-a55b and openai/gpt-5.6-luna. This makes side-by-side evals possible without maintaining two provider integrations.