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DeepSeek: DeepSeek V4.1 Flash vs OpenAI: gpt-oss-120b

Try both on us. Starter credit covers your first requests, then one key routes DeepSeek V4.1 Flash and gpt-oss-120b. 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 and the larger context window. gpt-oss-120b has the lower measured p50 time to first token. Both have 24 Credits provider routes.

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

$0.211/1MOpenAI: gpt-oss-120b cheapest route

886 msDeepSeek: DeepSeek V4.1 Flash fastest measured p50 TTFT via baseten

615 msOpenAI: gpt-oss-120b fastest measured p50 TTFT via cerebras

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 FlashOpenAI: gpt-oss-120b

Model iddeepseek/deepseek-v4.1-flashopenai/gpt-oss-120b

Publisher DeepSeek OpenAI

AI IQ IQ 126#24 IQ 98#136

Context1,048,576 tokens131,072 tokens

Credits provider routes2424

Cheapest route$0.15825/1M$0.211/1M

Cached input$0.01/1M to $0.1899/1M$0.015825/1M to $0.1055/1M

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

Fastest measured p50 TTFT886 ms via baseten615 ms via cerebras

Highest measured throughputnot enough data309 tok/s via sambanova

Recent route uptime range96.43% to 100.00%0.00% 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

OpenAI: gpt-oss-120b routes

Overview24 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 OpenAI: gpt-oss-120b?

DeepSeek V4.1 Flash has the lower published input-plus-output rate and the larger context window. gpt-oss-120b has the lower measured p50 time to first token. Both have 24 Credits provider routes.

Is DeepSeek: DeepSeek V4.1 Flash or OpenAI: gpt-oss-120b cheaper?

The current cheapest TrustedRouter route is $0.15825/1M for DeepSeek: DeepSeek V4.1 Flash and $0.211/1M for OpenAI: gpt-oss-120b. The comparison uses current catalog prices and updates as provider pricing changes.

Is DeepSeek: DeepSeek V4.1 Flash or OpenAI: gpt-oss-120b faster?

Current measured p50 time to first token is 886 ms for DeepSeek: DeepSeek V4.1 Flash and 615 ms for OpenAI: gpt-oss-120b. These are routed probe measurements, not vendor-advertised speeds, and update as new samples arrive.

Can I test DeepSeek: DeepSeek V4.1 Flash and OpenAI: gpt-oss-120b 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 openai/gpt-oss-120b. This makes side-by-side evals possible without maintaining two provider integrations.