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Anthropic: Claude Sonnet 5.5 vs DeepSeek: DeepSeek V4.1 Flash

Try both on us. Starter credit covers your first requests, then one key routes Claude Sonnet 5.5 and DeepSeek V4.1 Flash. 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, more Credits provider routes, the larger context window and the lower measured p50 time to first token.

$12.66/1MAnthropic: Claude Sonnet 5.5 cheapest route

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

3156 msAnthropic: Claude Sonnet 5.5 fastest measured p50 TTFT via anthropic

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

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.

Anthropic: Claude Sonnet 5.5DeepSeek: DeepSeek V4.1 Flash

Model idanthropic/claude-sonnet-5.5deepseek/deepseek-v4.1-flash

Publisher Anthropic DeepSeek

AI IQ IQ 137#7 IQ 126#22

Context1,000,000 tokens1,048,576 tokens

Credits provider routes124

Cheapest route$12.66/1M$0.1266/1M

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

Privacy postureprovider posture varieshas Confidential route (E2EE + ZDR)

Fastest measured p50 TTFT3156 ms via anthropic957 ms via together

Highest measured throughputnot enough datanot enough data

Recent route uptime range100.00%98.56% to 100.00%

Modes chat messages chat decide

Anthropic: Claude Sonnet 5.5 routes

Overview1 Credits routes

DeepSeek: DeepSeek V4.1 Flash 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="anthropic/claude-sonnet-5.5",
    messages=messages,
)

Questions

Which should I use, Anthropic: Claude Sonnet 5.5 or DeepSeek: DeepSeek V4.1 Flash?

DeepSeek V4.1 Flash has the lower published input-plus-output rate, more Credits provider routes, the larger context window and the lower measured p50 time to first token.

Is Anthropic: Claude Sonnet 5.5 or DeepSeek: DeepSeek V4.1 Flash cheaper?

The current cheapest TrustedRouter route is $12.66/1M for Anthropic: Claude Sonnet 5.5 and $0.1266/1M for DeepSeek: DeepSeek V4.1 Flash. The comparison uses current catalog prices and updates as provider pricing changes.

Is Anthropic: Claude Sonnet 5.5 or DeepSeek: DeepSeek V4.1 Flash faster?

Current measured p50 time to first token is 3156 ms for Anthropic: Claude Sonnet 5.5 and 957 ms for DeepSeek: DeepSeek V4.1 Flash. These are routed probe measurements, not vendor-advertised speeds, and update as new samples arrive.

Can I test Anthropic: Claude Sonnet 5.5 and DeepSeek: DeepSeek V4.1 Flash with the same API?

Yes. Use the same OpenAI-compatible TrustedRouter base URL and API key, then change only the model id between anthropic/claude-sonnet-5.5 and deepseek/deepseek-v4.1-flash. This makes side-by-side evals possible without maintaining two provider integrations.