OpenAI compatible API · Attested · Public status

DeepSeek: DeepSeek V3.1 Terminus vs DeepSeek: DeepSeek V4 Flash 0423

DeepSeek V3.1 Terminus vs DeepSeek V4 Flash 0423: 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 V4 Flash 0423 has the lower published input-plus-output rate, more Credits provider routes and the larger context window. There is not enough recent probe data to compare speed.

$1.31875/1MDeepSeek: DeepSeek V3.1 Terminus cheapest route

$0.24898/1MDeepSeek: DeepSeek V4 Flash 0423 cheapest route

not enough dataDeepSeek: DeepSeek V3.1 Terminus fastest measured p50 TTFT

1413 msDeepSeek: DeepSeek V4 Flash 0423 fastest measured p50 TTFT via deepseek

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 V3.1 TerminusDeepSeek: DeepSeek V4 Flash 0423

Model iddeepseek/deepseek-v3.1-terminusdeepseek/deepseek-v4-flash

Publisher DeepSeek DeepSeek

AI IQ — IQ 117#33

Context131,072 tokens1,048,576 tokens

Credits provider routes215

Cheapest route$1.31875/1M$0.24898/1M

Cached input$0.13715/1M to $0.142425/1M$0.01/1M to $0.074061/1M

Privacy postureprovider posture varieshas ZDR route

Fastest measured p50 TTFTnot enough data1413 ms via deepseek

Highest measured throughputnot enough data102 tok/s via mancer

Recent route uptime rangenot enough data60.00% to 100.00%

Modes chat chat

DeepSeek: DeepSeek V3.1 Terminus routes

Overview2 Credits routes
PricingInput, cached input, and output rates
ProvidersAll serving providers

DeepSeek: DeepSeek V4 Flash 0423 routes

Overview15 Credits routes
PricingInput, cached input, and output rates
BenchmarksTrustedRouter and external sources
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-v3.1-terminus",
    messages=messages,
)

Questions

Which should I use, DeepSeek: DeepSeek V3.1 Terminus or DeepSeek: DeepSeek V4 Flash 0423?

DeepSeek V4 Flash 0423 has the lower published input-plus-output rate, more Credits provider routes and the larger context window. There is not enough recent probe data to compare speed.

Is DeepSeek: DeepSeek V3.1 Terminus or DeepSeek: DeepSeek V4 Flash 0423 cheaper?

The current cheapest TrustedRouter route is $1.31875/1M for DeepSeek: DeepSeek V3.1 Terminus and $0.24898/1M for DeepSeek: DeepSeek V4 Flash 0423. The comparison uses current catalog prices and updates as provider pricing changes.

Is DeepSeek: DeepSeek V3.1 Terminus or DeepSeek: DeepSeek V4 Flash 0423 faster?

Current measured p50 time to first token is not enough data for DeepSeek: DeepSeek V3.1 Terminus and 1413 ms for DeepSeek: DeepSeek V4 Flash 0423. These are routed probe measurements, not vendor-advertised speeds, and update as new samples arrive.

Can I test DeepSeek: DeepSeek V3.1 Terminus and DeepSeek: DeepSeek V4 Flash 0423 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-v3.1-terminus and deepseek/deepseek-v4-flash. This makes side-by-side evals possible without maintaining two provider integrations.