Free to start

Kimi K3 Fast vs OpenAI: gpt-oss-120b

Try both on us. Starter credit covers your first requests, then one key routes Kimi K3 Fast 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

Kimi K3 Fast has the larger context window. gpt-oss-120b has the lower published input-plus-output rate and more Credits provider routes. There is not enough recent probe data to compare speed.

$28.485/1MKimi K3 Fast cheapest route

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

not enough dataKimi K3 Fast fastest measured p50 TTFT

543 msOpenAI: gpt-oss-120b fastest measured p50 TTFT via akashml

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.

Kimi K3 FastOpenAI: gpt-oss-120b

Model idmoonshotai/kimi-k3-fast-apiopenai/gpt-oss-120b

Publisher Kimi OpenAI

AI IQ — IQ 98#136

Context1,000,000 tokens131,072 tokens

Credits provider routes124

Cheapest route$28.485/1M$0.211/1M

Cached input$0.47475/1M$0.015825/1M to $0.1055/1M

Privacy postureprovider posture varieshas Confidential route (E2EE + ZDR)

Fastest measured p50 TTFTnot enough data543 ms via akashml

Highest measured throughputnot enough data309 tok/s via sambanova

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

Modes chat chat

Kimi K3 Fast routes

Overview1 Credits routes

OpenAI: gpt-oss-120b routes

Overview24 Credits routes
PricingInput, cached input, and output rates
ProvidersAll serving providers

Related comparisons

Browse every comparison

OpenAI: gpt-oss-120b vs Z.ai: GLM 5.357 combined provider routes
OpenAI: gpt-oss-120b vs Z.ai: GLM 5.256 combined provider routes
OpenAI: gpt-oss-120b vs Z.ai: GLM 5.3 Flash56 combined provider routes
MoonshotAI: Kimi K3 vs OpenAI: gpt-oss-120b52 combined provider routes
DeepSeek: DeepSeek V4 Flash 0731 vs OpenAI: gpt-oss-120b50 combined provider routes
DeepSeek: DeepSeek V4.1 Flash vs OpenAI: gpt-oss-120b48 combined provider routes
OpenAI: gpt-oss-120b vs Qwen: Qwen3.8 27B46 combined provider routes
MoonshotAI: Kimi K2.6 vs OpenAI: gpt-oss-120b41 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="moonshotai/kimi-k3-fast-api",
    messages=messages,
)

Questions

Which should I use, Kimi K3 Fast or OpenAI: gpt-oss-120b?

Kimi K3 Fast has the larger context window. gpt-oss-120b has the lower published input-plus-output rate and more Credits provider routes. There is not enough recent probe data to compare speed.

Is Kimi K3 Fast or OpenAI: gpt-oss-120b cheaper?

The current cheapest TrustedRouter route is $28.485/1M for Kimi K3 Fast and $0.211/1M for OpenAI: gpt-oss-120b. The comparison uses current catalog prices and updates as provider pricing changes.

Is Kimi K3 Fast or OpenAI: gpt-oss-120b faster?

Current measured p50 time to first token is not enough data for Kimi K3 Fast and 543 ms for OpenAI: gpt-oss-120b. These are routed probe measurements, not vendor-advertised speeds, and update as new samples arrive.

Can I test Kimi K3 Fast 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 moonshotai/kimi-k3-fast-api and openai/gpt-oss-120b. This makes side-by-side evals possible without maintaining two provider integrations.