OpenAI compatible API · Attested · Public status

DeepSeek: DeepSeek V4 Flash 0731 vs Qwen3.5 Plus

DeepSeek V4 Flash 0731 vs Qwen3.5 Plus: compare current API pricing, context, provider routes, privacy, p50 latency, and OpenAI-compatible access.

Verify gateway

Onebase URL to migrate

100sof models and routes

0prompt or output logs. Always.

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: DeepSeek V4 Flash 0731 has the lower cheapest prompt+completion route on TrustedRouter. DeepSeek: DeepSeek V4 Flash 0731 has more provider fallback routes, while DeepSeek: DeepSeek V4 Flash 0731 has the larger context window. Probe-backed speed data is shown when enough recent samples exist.

$0.2743/1MDeepSeek: DeepSeek V4 Flash 0731 cheapest route

$2.954/1MQwen3.5 Plus cheapest route

1422 msDeepSeek: DeepSeek V4 Flash 0731 fastest measured p50 TTFT via akashml

not enough dataQwen3.5 Plus fastest measured p50 TTFT

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 0731Qwen3.5 Plus

Model iddeepseek/deepseek-v4-flash-0731qwen/qwen3.5-plus

Publisher DeepSeek Atlas Cloud

AI IQ — —

Context1,310,720 tokens1,000,000 tokens

Provider routes332

Cheapest route$0.2743/1M$2.954/1M

Privacy posturehas ZDR routeprovider posture varies

Fastest measured p50 TTFT1422 ms via akashmlnot enough data

Highest measured throughputnot enough datanot enough data

Recent route uptime range92.84% to 100.00%100.00%

Modes chat chat

DeepSeek: DeepSeek V4 Flash 0731 routes

Overview33 endpoints
PricingPrompt and completion rates
ProvidersAll serving providers

Qwen3.5 Plus routes

Overview2 endpoints
PricingPrompt and completion 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 Qwen3.5 Plus?

Is DeepSeek: DeepSeek V4 Flash 0731 or Qwen3.5 Plus cheaper?

The current cheapest TrustedRouter route is $0.2743/1M for DeepSeek: DeepSeek V4 Flash 0731 and $2.954/1M for Qwen3.5 Plus. The comparison uses current catalog prices and updates as provider pricing changes.

Is DeepSeek: DeepSeek V4 Flash 0731 or Qwen3.5 Plus faster?

Current measured p50 time to first token is 1422 ms for DeepSeek: DeepSeek V4 Flash 0731 and not enough data for Qwen3.5 Plus. These are routed probe measurements, not vendor-advertised speeds, and update as new samples arrive.

Can I test DeepSeek: DeepSeek V4 Flash 0731 and Qwen3.5 Plus 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 qwen/qwen3.5-plus. This makes side-by-side evals possible without maintaining two provider integrations.