OpenAI compatible API · Attested · Public status

Anthropic: Claude Sonnet 4.5 vs MoonshotAI: Kimi K3

Claude Sonnet 4.5 vs MoonshotAI: Kimi K3: 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

MoonshotAI: Kimi K3 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.

$18.99/1MAnthropic: Claude Sonnet 4.5 cheapest route

$12.3435/1MMoonshotAI: Kimi K3 cheapest route

2297 msAnthropic: Claude Sonnet 4.5 fastest measured p50 TTFT via anthropic

876 msMoonshotAI: Kimi K3 fastest measured p50 TTFT via wafer

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 4.5MoonshotAI: Kimi K3

Model idanthropic/claude-sonnet-4.5moonshotai/kimi-k3

Publisher Anthropic Kimi

AI IQ — IQ 121#24

Context1,000,000 tokens1,048,576 tokens

Credits provider routes124

Cheapest route$18.99/1M$12.3435/1M

Cached input$0.3165/1M$0.205725/1M to $1.693275/1M

Privacy postureprovider posture varieshas provider E2EE route

Fastest measured p50 TTFT2297 ms via anthropic876 ms via wafer

Highest measured throughputnot enough data29 tok/s via atlas-cloud

Recent route uptime range100.00%0.00% to 100.00%

Modes chat messages chat

Anthropic: Claude Sonnet 4.5 routes

Overview1 Credits routes
BenchmarksTrustedRouter and external sources

MoonshotAI: Kimi K3 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-4.5",
    messages=messages,
)

Questions

Which should I use, Anthropic: Claude Sonnet 4.5 or MoonshotAI: Kimi K3?

MoonshotAI: Kimi K3 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 4.5 or MoonshotAI: Kimi K3 cheaper?

The current cheapest TrustedRouter route is $18.99/1M for Anthropic: Claude Sonnet 4.5 and $12.3435/1M for MoonshotAI: Kimi K3. The comparison uses current catalog prices and updates as provider pricing changes.

Is Anthropic: Claude Sonnet 4.5 or MoonshotAI: Kimi K3 faster?

Current measured p50 time to first token is 2297 ms for Anthropic: Claude Sonnet 4.5 and 876 ms for MoonshotAI: Kimi K3. These are routed probe measurements, not vendor-advertised speeds, and update as new samples arrive.

Can I test Anthropic: Claude Sonnet 4.5 and MoonshotAI: Kimi K3 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 and moonshotai/kimi-k3. This makes side-by-side evals possible without maintaining two provider integrations.