OpenAI compatible API · Attested · Public status

Claude Sonnet 4.5 vs DeepSeek: DeepSeek V4.1 Flash

Claude Sonnet 4.5 vs DeepSeek V4.1 Flash: 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 V4.1 Flash has the lower cheapest prompt+completion route on TrustedRouter. DeepSeek: DeepSeek V4.1 Flash has more provider fallback routes, while DeepSeek: DeepSeek V4.1 Flash has the larger context window. Probe-backed speed data is shown when enough recent samples exist.

$18.99/1MClaude Sonnet 4.5 cheapest route

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

not enough dataClaude Sonnet 4.5 fastest measured p50 TTFT

1489 msDeepSeek: DeepSeek V4.1 Flash fastest measured p50 TTFT via makora

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.

Claude Sonnet 4.5DeepSeek: DeepSeek V4.1 Flash

Model idanthropic/claude-sonnet-4-5-20250929deepseek/deepseek-v4.1-flash

Publisher Anthropic DeepSeek

AI IQ — IQ 116#38

Context200,000 tokens1,048,576 tokens

Credits provider routes014

Cheapest route$18.99/1M$0.1266/1M

Cached inputNot published$0.01/1M to $0.162998/1M

Privacy postureprovider posture varieshas provider E2EE route

Fastest measured p50 TTFTnot enough data1489 ms via makora

Highest measured throughputnot enough datanot enough data

Recent route uptime rangenot enough data85.04% to 100.00%

Modes chat messages chat

Claude Sonnet 4.5 routes

Overview0 Credits routes

DeepSeek: DeepSeek V4.1 Flash routes

Overview14 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-4-5-20250929",
    messages=messages,
)

Questions

Which should I use, Claude Sonnet 4.5 or DeepSeek: DeepSeek V4.1 Flash?

Is Claude Sonnet 4.5 or DeepSeek: DeepSeek V4.1 Flash cheaper?

The current cheapest TrustedRouter route is $18.99/1M for Claude Sonnet 4.5 and $0.1266/1M for DeepSeek: DeepSeek V4.1 Flash. The comparison uses current catalog prices and updates as provider pricing changes.

Is Claude Sonnet 4.5 or DeepSeek: DeepSeek V4.1 Flash faster?

Current measured p50 time to first token is not enough data for Claude Sonnet 4.5 and 1489 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 Claude Sonnet 4.5 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-4-5-20250929 and deepseek/deepseek-v4.1-flash. This makes side-by-side evals possible without maintaining two provider integrations.