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MoonshotAI: Kimi K3 vs StepFun: Step-3.7-Flash

Try both on us. Starter credit covers your first requests, then one key routes Kimi K3 and Step-3.7-Flash. 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

MoonshotAI: Kimi K3 has more Credits provider routes and the larger context window. StepFun: Step-3.7-Flash has the lower published input-plus-output rate. There is not enough recent probe data to compare speed.

$11.97425/1MMoonshotAI: Kimi K3 cheapest route

$1.42425/1MStepFun: Step-3.7-Flash cheapest route

980 msMoonshotAI: Kimi K3 fastest measured p50 TTFT via lyceum

not enough dataStepFun: Step-3.7-Flash 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-3.7-Flash

Model idmoonshotai/kimi-k3stepfun-ai/step-3.7-flash

Publisher Kimi StepFun

AI IQ IQ 127#21 IQ 103#109

Context1,048,576 tokens256,000 tokens

Credits provider routes281

Cheapest route$11.97425/1M$1.42425/1M

Cached input$0.195175/1M to $1.897945/1MNot published

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

Fastest measured p50 TTFT980 ms via lyceumnot enough data

Highest measured throughput172 tok/s via sail-researchnot enough data

Recent route uptime range0.00% to 100.00%not enough data

Modes chat chat

MoonshotAI: Kimi K3 routes

Overview28 Credits routes
PricingInput, cached input, and output rates
ProvidersAll serving providers

StepFun: Step-3.7-Flash routes

Overview1 Credits 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.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-3.7-Flash?

Is MoonshotAI: Kimi K3 or StepFun: Step-3.7-Flash cheaper?

The current cheapest TrustedRouter route is $11.97425/1M for MoonshotAI: Kimi K3 and $1.42425/1M for StepFun: Step-3.7-Flash. The comparison uses current catalog prices and updates as provider pricing changes.

Is MoonshotAI: Kimi K3 or StepFun: Step-3.7-Flash faster?

Current measured p50 time to first token is 980 ms for MoonshotAI: Kimi K3 and not enough data for StepFun: Step-3.7-Flash. These are routed probe measurements, not vendor-advertised speeds, and update as new samples arrive.

Can I test MoonshotAI: Kimi K3 and StepFun: Step-3.7-Flash 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-ai/step-3.7-flash. This makes side-by-side evals possible without maintaining two provider integrations.