OpenAI compatible API · Attested · Public status

MoonshotAI: Kimi K3 vs StepFun: Step 5 Preview

MoonshotAI: Kimi K3 has more Credits provider routes. StepFun: Step 5 Preview has the lower published input-plus-output rate. Their context windows are the same size. There is not enough recent probe data to compare speed. Compare price, speed, context, and privacy.

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

$11.97425/1MMoonshotAI: Kimi K3 cheapest route

$3.9035/1MStepFun: Step 5 Preview cheapest route

991 msMoonshotAI: Kimi K3 fastest measured p50 TTFT via nebius

not enough dataStepFun: Step 5 Preview 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.

MoonshotAI: Kimi K3StepFun: Step 5 Preview

Model idmoonshotai/kimi-k3stepfun/step-5-preview

Publisher Kimi StepFun

AI IQ IQ 127#20 —

Context1,048,576 tokens1,048,576 tokens

Credits provider routes292

Cheapest route$11.97425/1M$3.9035/1M

Cached input$0.195175/1M to $1.897945/1M$0.05275/1M to $0.1055/1M

Privacy posturehas Confidential route (E2EE + ZDR)provider posture varies

Fastest measured p50 TTFT991 ms via nebiusnot enough data

Highest measured throughput124 tok/s via io-netnot enough data

Recent route uptime range0.00% to 100.00%100.00%

Modes chat chat

MoonshotAI: Kimi K3 routes

Overview29 Credits routes
PricingInput, cached input, and output rates
ProvidersAll serving providers

StepFun: Step 5 Preview routes

Overview2 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",
    messages=messages,
)

Questions

Which should I use, MoonshotAI: Kimi K3 or StepFun: Step 5 Preview?

Is MoonshotAI: Kimi K3 or StepFun: Step 5 Preview cheaper?

The current cheapest TrustedRouter route is $11.97425/1M for MoonshotAI: Kimi K3 and $3.9035/1M for StepFun: Step 5 Preview. The comparison uses current catalog prices and updates as provider pricing changes.

Is MoonshotAI: Kimi K3 or StepFun: Step 5 Preview faster?

Current measured p50 time to first token is 991 ms for MoonshotAI: Kimi K3 and not enough data for StepFun: Step 5 Preview. These are routed probe measurements, not vendor-advertised speeds, and update as new samples arrive.

Can I test MoonshotAI: Kimi K3 and StepFun: Step 5 Preview 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 and stepfun/step-5-preview. This makes side-by-side evals possible without maintaining two provider integrations.