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DeepSeek: DeepSeek V4.1 Flash vs Qwen: Qwen3.5 397B A17B

Try both on us. Starter credit covers your first requests, then one key routes DeepSeek V4.1 Flash and Qwen3.5 397B A17B. 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.

$0.15825/1MDeepSeek: DeepSeek V4.1 Flash cheapest route

$3.63975/1MQwen: Qwen3.5 397B A17B cheapest route

1010 msDeepSeek: DeepSeek V4.1 Flash fastest measured p50 TTFT via crusoe

1453 msQwen: Qwen3.5 397B A17B fastest measured p50 TTFT via parasail

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 FlashQwen: Qwen3.5 397B A17B

Model iddeepseek/deepseek-v4.1-flashqwen/qwen3.5-397b-a17b

Publisher DeepSeek Alibaba Cloud Model Studio

AI IQ IQ 126#24 —

Context1,048,576 tokens262,144 tokens

Credits provider routes2412

Cheapest route$0.15825/1M$3.63975/1M

Cached input$0.01/1M to $0.174075/1M$0.047475/1M to $0.58025/1M

Privacy posturehas Confidential route (E2EE + ZDR)has Confidential route (E2EE + ZDR)

Fastest measured p50 TTFT1010 ms via crusoe1453 ms via parasail

Highest measured throughputnot enough datanot enough data

Recent route uptime range0.00% to 100.00%50.00% to 100.00%

Modes chat decide chat

DeepSeek: DeepSeek V4.1 Flash routes

Overview24 Credits routes
PricingInput, cached input, and output rates
ProvidersAll serving providers

Qwen: Qwen3.5 397B A17B routes

Overview12 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 Qwen: Qwen3.5 397B A17B?

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 Qwen: Qwen3.5 397B A17B cheaper?

The current cheapest TrustedRouter route is $0.15825/1M for DeepSeek: DeepSeek V4.1 Flash and $3.63975/1M for Qwen: Qwen3.5 397B A17B. The comparison uses current catalog prices and updates as provider pricing changes.

Is DeepSeek: DeepSeek V4.1 Flash or Qwen: Qwen3.5 397B A17B faster?

Current measured p50 time to first token is 1010 ms for DeepSeek: DeepSeek V4.1 Flash and 1453 ms for Qwen: Qwen3.5 397B A17B. These are routed probe measurements, not vendor-advertised speeds, and update as new samples arrive.

Can I test DeepSeek: DeepSeek V4.1 Flash and Qwen: Qwen3.5 397B A17B 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 qwen/qwen3.5-397b-a17b. This makes side-by-side evals possible without maintaining two provider integrations.