OpenAI compatible API · Attested · Public status

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

Kimi K3 Fast on Fireworks vs gpt-oss-120b: 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

OpenAI: gpt-oss-120b has the lower cheapest prompt+completion route on TrustedRouter. OpenAI: gpt-oss-120b has more provider fallback routes, while Kimi K3 Fast on Fireworks has the larger context window. Current TrustedRouter probes show OpenAI: gpt-oss-120b with the lower p50 TTFT.

$28.485/1MKimi K3 Fast on Fireworks cheapest route

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

1175 msKimi K3 Fast on Fireworks fastest measured p50 TTFT via fireworks

596 msOpenAI: gpt-oss-120b fastest measured p50 TTFT via cerebras

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 Fast on FireworksOpenAI: gpt-oss-120b

Model idmoonshotai/kimi-k3-fastopenai/gpt-oss-120b

Publisher Kimi OpenAI

AI IQ — IQ 105#70

Context1,048,576 tokens131,072 tokens

Credits provider routes119

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

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

Privacy postureprovider posture varieshas provider E2EE route

Fastest measured p50 TTFT1175 ms via fireworks596 ms via cerebras

Highest measured throughputnot enough datanot enough data

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

Modes chat chat

Kimi K3 Fast on Fireworks routes

Overview1 Credits routes

OpenAI: gpt-oss-120b routes

Overview19 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="moonshotai/kimi-k3-fast",
    messages=messages,
)

Questions

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

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

The current cheapest TrustedRouter route is $28.485/1M for Kimi K3 Fast on Fireworks 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 on Fireworks or OpenAI: gpt-oss-120b faster?

Current measured p50 time to first token is 1175 ms for Kimi K3 Fast on Fireworks and 596 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 on Fireworks 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 and openai/gpt-oss-120b. This makes side-by-side evals possible without maintaining two provider integrations.