OpenAI compatible API · Attested · Public status

nemotron-3-ultra-550b-a55b vs Z.ai: GLM 5.3 Flash

nemotron-3-ultra-550b-a55b vs Z.ai: GLM 5.3 Flash: compare current API pricing, context, provider routes, privacy, p50 latency, and OpenAI-compatible access.

Verify gateway

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

Monthly evidence

Z.ai: GLM 5.3 Flash has the lower cheapest prompt+completion route on TrustedRouter. Z.ai: GLM 5.3 Flash has more provider fallback routes, while Z.ai: GLM 5.3 Flash has the larger context window. Current TrustedRouter probes show Z.ai: GLM 5.3 Flash with the lower p50 TTFT.

$1.69855/1Mnemotron-3-ultra-550b-a55b cheapest route

$0.32705/1MZ.ai: GLM 5.3 Flash cheapest route

2569 msnemotron-3-ultra-550b-a55b fastest measured p50 TTFT via lightning

1284 msZ.ai: GLM 5.3 Flash fastest measured p50 TTFT via friendli

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.

nemotron-3-ultra-550b-a55bZ.ai: GLM 5.3 Flash

Model idlightning-ai/nemotron-3-ultra-550b-a55bz-ai/glm-5.3-flash

Publisher Lightning AI Z.AI

AI IQ — IQ 121#24

Context262,144 tokens1,048,576 tokens

Credits provider routes120

Cheapest route$1.69855/1M$0.32705/1M

Cached inputNot published$0.015825/1M to $0.1055/1M

Privacy postureprovider posture varieshas provider E2EE route

Fastest measured p50 TTFT2569 ms via lightning1284 ms via friendli

Highest measured throughputnot enough datanot enough data

Recent route uptime range100.00%0.00% to 100.00%

Modes chat chat

nemotron-3-ultra-550b-a55b routes

Overview1 Credits routes

Z.ai: GLM 5.3 Flash routes

Overview20 Credits routes
PricingInput, cached input, and output rates
ProvidersAll serving providers

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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.trustedrouter.com/v1",
    api_key="sk-tr-v1-..."
)

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

Questions

Which should I use, nemotron-3-ultra-550b-a55b or Z.ai: GLM 5.3 Flash?

Is nemotron-3-ultra-550b-a55b or Z.ai: GLM 5.3 Flash cheaper?

The current cheapest TrustedRouter route is $1.69855/1M for nemotron-3-ultra-550b-a55b and $0.32705/1M for Z.ai: GLM 5.3 Flash. The comparison uses current catalog prices and updates as provider pricing changes.

Is nemotron-3-ultra-550b-a55b or Z.ai: GLM 5.3 Flash faster?

Current measured p50 time to first token is 2569 ms for nemotron-3-ultra-550b-a55b and 1284 ms for Z.ai: GLM 5.3 Flash. These are routed probe measurements, not vendor-advertised speeds, and update as new samples arrive.

Can I test nemotron-3-ultra-550b-a55b and Z.ai: GLM 5.3 Flash with the same API?

Yes. Use the same OpenAI-compatible TrustedRouter base URL and API key, then change only the model id between lightning-ai/nemotron-3-ultra-550b-a55b and z-ai/glm-5.3-flash. This makes side-by-side evals possible without maintaining two provider integrations.