OpenAI compatible API · Attested · Public status

Kimi K3 Fast vs Z.ai: GLM 5.3

Kimi K3 Fast vs Z.ai: GLM 5.3: 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 has the lower published input-plus-output rate, more Credits provider routes and the larger context window. There is not enough recent probe data to compare speed.

$28.485/1MKimi K3 Fast cheapest route

$3.621393/1MZ.ai: GLM 5.3 cheapest route

not enough dataKimi K3 Fast fastest measured p50 TTFT

639 msZ.ai: GLM 5.3 fastest measured p50 TTFT via wafer

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.

Kimi K3 FastZ.ai: GLM 5.3

Model idmoonshotai/kimi-k3-fast-apiz-ai/glm-5.3

Publisher Kimi Z.AI

AI IQ — IQ 127#15

Context1,000,000 tokens1,048,576 tokens

Credits provider routes127

Cheapest route$28.485/1M$3.621393/1M

Cached input$0.47475/1M$0.1477/1M to $1.02546/1M

Privacy postureprovider posture varieshas provider E2EE route

Fastest measured p50 TTFTnot enough data639 ms via wafer

Highest measured throughputnot enough data286 tok/s via akashml

Recent route uptime rangenot enough data87.50% to 100.00%

Modes chat chat

Kimi K3 Fast routes

Overview1 Credits routes

Z.ai: GLM 5.3 routes

Overview27 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="moonshotai/kimi-k3-fast-api",
    messages=messages,
)

Questions

Which should I use, Kimi K3 Fast or Z.ai: GLM 5.3?

Z.ai: GLM 5.3 has the lower published input-plus-output rate, more Credits provider routes and the larger context window. There is not enough recent probe data to compare speed.

Is Kimi K3 Fast or Z.ai: GLM 5.3 cheaper?

The current cheapest TrustedRouter route is $28.485/1M for Kimi K3 Fast and $3.621393/1M for Z.ai: GLM 5.3. The comparison uses current catalog prices and updates as provider pricing changes.

Is Kimi K3 Fast or Z.ai: GLM 5.3 faster?

Current measured p50 time to first token is not enough data for Kimi K3 Fast and 639 ms for Z.ai: GLM 5.3. These are routed probe measurements, not vendor-advertised speeds, and update as new samples arrive.

Can I test Kimi K3 Fast and Z.ai: GLM 5.3 with the same API?

Yes. Use the same OpenAI-compatible TrustedRouter base URL and API key, then change only the model id between moonshotai/kimi-k3-fast-api and z-ai/glm-5.3. This makes side-by-side evals possible without maintaining two provider integrations.