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DeepSeek: DeepSeek V4.1 Flash vs StepFun: Step 3.7 Flash

Try both on us. Starter credit covers your first requests, then one key routes DeepSeek V4.1 Flash 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 V4.1 Flash 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.

$0.1266/1MDeepSeek: DeepSeek V4.1 Flash cheapest route

$1.42425/1MStepFun: Step 3.7 Flash cheapest route

838 msDeepSeek: DeepSeek V4.1 Flash fastest measured p50 TTFT via together

2362 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 V4.1 FlashStepFun: Step 3.7 Flash

Model iddeepseek/deepseek-v4.1-flashstepfun/step-3.7-flash

Publisher DeepSeek StepFun

AI IQ IQ 126#21 IQ 103#110

Context1,048,576 tokens262,144 tokens

Credits provider routes242

Cheapest route$0.1266/1M$1.42425/1M

Cached input$0.01/1M to $0.1899/1M$0.0422/1M

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

Fastest measured p50 TTFT838 ms via together2362 ms via stepfun

Highest measured throughput157 tok/s via tinfoil145 tok/s via stepfun

Recent route uptime range100.00%100.00%

Modes chat decide chat

DeepSeek: DeepSeek V4.1 Flash routes

Overview24 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-v4.1-flash",
    messages=messages,
)

Questions

Which should I use, DeepSeek: DeepSeek V4.1 Flash or StepFun: Step 3.7 Flash?

DeepSeek V4.1 Flash 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 V4.1 Flash or StepFun: Step 3.7 Flash cheaper?

The current cheapest TrustedRouter route is $0.1266/1M for DeepSeek: DeepSeek V4.1 Flash 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 V4.1 Flash or StepFun: Step 3.7 Flash faster?

Current measured p50 time to first token is 838 ms for DeepSeek: DeepSeek V4.1 Flash and 2362 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 V4.1 Flash 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-v4.1-flash and stepfun/step-3.7-flash. This makes side-by-side evals possible without maintaining two provider integrations.