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DeepSeek: DeepSeek V4 Flash 0731 vs StepFun: Step 3.7 Flash

Try both on us. Starter credit covers your first requests, then one key routes DeepSeek V4 Flash 0731 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

DeepSeek V4 Flash 0731 has the lower published input-plus-output rate, more Credits provider routes, the larger context window and the lower measured p50 time to first token.

$0.142425/1MDeepSeek: DeepSeek V4 Flash 0731 cheapest route

$1.42425/1MStepFun: Step 3.7 Flash cheapest route

841 msDeepSeek: DeepSeek V4 Flash 0731 fastest measured p50 TTFT via boundless

2398 msStepFun: Step 3.7 Flash fastest measured p50 TTFT via stepfun

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.

DeepSeek: DeepSeek V4 Flash 0731StepFun: Step 3.7 Flash

Model iddeepseek/deepseek-v4-flash-0731stepfun/step-3.7-flash

Publisher DeepSeek StepFun

AI IQ — IQ 103#109

Context1,048,576 tokens262,144 tokens

Credits provider routes262

Cheapest route$0.142425/1M$1.42425/1M

Cached input$0.01/1M to $0.118793/1M$0.0422/1M

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

Fastest measured p50 TTFT841 ms via boundless2398 ms via stepfun

Highest measured throughput171 tok/s via confidential-ai159 tok/s via stepfun

Recent route uptime range50.00% to 100.00%100.00%

Modes chat chat

DeepSeek: DeepSeek V4 Flash 0731 routes

Overview26 Credits routes
PricingInput, cached input, and output rates
ProvidersAll serving providers

StepFun: Step 3.7 Flash 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="deepseek/deepseek-v4-flash-0731",
    messages=messages,
)

Questions

Which should I use, DeepSeek: DeepSeek V4 Flash 0731 or StepFun: Step 3.7 Flash?

DeepSeek V4 Flash 0731 has the lower published input-plus-output rate, more Credits provider routes, the larger context window and the lower measured p50 time to first token.

Is DeepSeek: DeepSeek V4 Flash 0731 or StepFun: Step 3.7 Flash cheaper?

The current cheapest TrustedRouter route is $0.142425/1M for DeepSeek: DeepSeek V4 Flash 0731 and $1.42425/1M for StepFun: Step 3.7 Flash. The comparison uses current catalog prices and updates as provider pricing changes.

Is DeepSeek: DeepSeek V4 Flash 0731 or StepFun: Step 3.7 Flash faster?

Current measured p50 time to first token is 841 ms for DeepSeek: DeepSeek V4 Flash 0731 and 2398 ms for StepFun: Step 3.7 Flash. These are routed probe measurements, not vendor-advertised speeds, and update as new samples arrive.

Can I test DeepSeek: DeepSeek V4 Flash 0731 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 deepseek/deepseek-v4-flash-0731 and stepfun/step-3.7-flash. This makes side-by-side evals possible without maintaining two provider integrations.