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DeepSeek: DeepSeek V4 Flash 0731 vs Union Alpha

Try both on us. Starter credit covers your first requests, then one key routes DeepSeek V4 Flash 0731 and Union Alpha. 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 more Credits provider routes and the larger context window. Union Alpha has the lower published input-plus-output rate. There is not enough recent probe data to compare speed.

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

$0.02/1MUnion Alpha cheapest route

not enough dataDeepSeek: DeepSeek V4 Flash 0731 fastest measured p50 TTFT

not enough dataUnion Alpha 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.

DeepSeek: DeepSeek V4 Flash 0731Union Alpha

Model iddeepseek/deepseek-v4-flash-0731stealth/union-alpha

Publisher DeepSeek Not stated

AI IQ — —

Context1,048,576 tokens262,144 tokens

Credits provider routes261

Cheapest route$0.142425/1M$0.02/1M

Cached input$0.01/1M to $0.118793/1MNot published

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

Fastest measured p50 TTFTnot enough datanot enough data

Highest measured throughputnot enough datanot enough data

Recent route uptime rangenot enough datanot enough data

Modes chat chat

DeepSeek: DeepSeek V4 Flash 0731 routes

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

Union Alpha 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-azure.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 Union Alpha?

Is DeepSeek: DeepSeek V4 Flash 0731 or Union Alpha cheaper?

The current cheapest TrustedRouter route is $0.142425/1M for DeepSeek: DeepSeek V4 Flash 0731 and $0.02/1M for Union Alpha. The comparison uses current catalog prices and updates as provider pricing changes.

Is DeepSeek: DeepSeek V4 Flash 0731 or Union Alpha faster?

Current measured p50 time to first token is not enough data for DeepSeek: DeepSeek V4 Flash 0731 and not enough data for Union Alpha. These are routed probe measurements, not vendor-advertised speeds, and update as new samples arrive.

Can I test DeepSeek: DeepSeek V4 Flash 0731 and Union Alpha 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 stealth/union-alpha. This makes side-by-side evals possible without maintaining two provider integrations.