OpenAI compatible API · Attested · Public status

DeepSeek: DeepSeek V4.1 Flash vs GPT 5.4

DeepSeek V4.1 Flash vs GPT 5.4: 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 V4.1 Flash has the lower published input-plus-output rate and more Credits provider routes. GPT 5.4 has the larger context window. There is not enough recent probe data to compare speed.

$0.1266/1MDeepSeek: DeepSeek V4.1 Flash cheapest route

$18.4625/1MGPT 5.4 cheapest route

766 msDeepSeek: DeepSeek V4.1 Flash fastest measured p50 TTFT via together

not enough dataGPT 5.4 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 V4.1 FlashGPT 5.4

Model iddeepseek/deepseek-v4.1-flashopenai/gpt-5.4-2026-03-05

Publisher DeepSeek OpenAI

AI IQ IQ 116#37 —

Context1,048,576 tokens1,050,000 tokens

Credits provider routes141

Cheapest route$0.1266/1M$18.4625/1M

Cached input$0.01/1M to $0.15825/1MNot published

Privacy posturehas provider E2EE routeprovider posture varies

Fastest measured p50 TTFT766 ms via togethernot enough data

Highest measured throughputnot enough datanot enough data

Recent route uptime range100.00%100.00%

Modes chat decide chat

DeepSeek: DeepSeek V4.1 Flash routes

Overview14 Credits routes
PricingInput, cached input, and output rates
ProvidersAll serving providers

GPT 5.4 routes

Overview1 Credits routes

Related comparisons

Browse every comparison

DeepSeek: DeepSeek V4.1 Flash vs Z.ai: GLM 5.242 combined provider routes
DeepSeek: DeepSeek V4.1 Flash vs Z.ai: GLM 5.340 combined provider routes
DeepSeek: DeepSeek V4.1 Flash vs Z.ai: GLM 5.3 Flash39 combined provider routes
DeepSeek: DeepSeek V4 Flash 0731 vs DeepSeek: DeepSeek V4.1 Flash38 combined provider routes
DeepSeek: DeepSeek V4.1 Flash vs MoonshotAI: Kimi K338 combined provider routes
DeepSeek: DeepSeek V4.1 Flash vs OpenAI: gpt-oss-120b36 combined provider routes
DeepSeek: DeepSeek V4.1 Flash vs MoonshotAI: Kimi K2.633 combined provider routes
DeepSeek: DeepSeek V4 Pro 0423 vs DeepSeek: DeepSeek V4.1 Flash31 combined provider routes

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 GPT 5.4?

DeepSeek V4.1 Flash has the lower published input-plus-output rate and more Credits provider routes. GPT 5.4 has the larger context window. There is not enough recent probe data to compare speed.

Is DeepSeek: DeepSeek V4.1 Flash or GPT 5.4 cheaper?

The current cheapest TrustedRouter route is $0.1266/1M for DeepSeek: DeepSeek V4.1 Flash and $18.4625/1M for GPT 5.4. The comparison uses current catalog prices and updates as provider pricing changes.

Is DeepSeek: DeepSeek V4.1 Flash or GPT 5.4 faster?

Current measured p50 time to first token is 766 ms for DeepSeek: DeepSeek V4.1 Flash and not enough data for GPT 5.4. These are routed probe measurements, not vendor-advertised speeds, and update as new samples arrive.

Can I test DeepSeek: DeepSeek V4.1 Flash and GPT 5.4 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-5.4-2026-03-05. This makes side-by-side evals possible without maintaining two provider integrations.