OpenAI compatible API · Attested · Public status

FLUX.2 [klein] 4B vs OpenAI: gpt-oss-120b

FLUX.2 [klein] 4B 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

FLUX.2 [klein] 4B has the lower cheapest prompt+completion route on TrustedRouter. OpenAI: gpt-oss-120b has more provider fallback routes, while OpenAI: gpt-oss-120b has the larger context window. Probe-backed speed data is shown when enough recent samples exist.

selected routeFLUX.2 [klein] 4B cheapest route

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

not enough dataFLUX.2 [klein] 4B fastest measured p50 TTFT

1399 msOpenAI: gpt-oss-120b fastest measured p50 TTFT via baseten

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.

FLUX.2 [klein] 4BOpenAI: gpt-oss-120b

Model idblack-forest-labs/flux-2-klein-4bopenai/gpt-oss-120b

Publisher Black Forest Labs OpenAI

AI IQ — IQ 98#99

Context0 tokens131,072 tokens

Credits provider routes122

Cheapest routeselected route$0.211/1M

Cached inputNot published$0.015825/1M to $0.1055/1M

Privacy postureprovider posture varieshas provider E2EE route

Fastest measured p50 TTFTnot enough data1399 ms via baseten

Highest measured throughputnot enough data149 tok/s via io-net

Recent route uptime rangenot enough data100.00%

Modes chat

FLUX.2 [klein] 4B routes

Overview1 Credits routes

OpenAI: gpt-oss-120b routes

Overview22 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="black-forest-labs/flux-2-klein-4b",
    messages=messages,
)

Questions

Which should I use, FLUX.2 [klein] 4B or OpenAI: gpt-oss-120b?

Is FLUX.2 [klein] 4B or OpenAI: gpt-oss-120b cheaper?

The current cheapest TrustedRouter route is selected route for FLUX.2 [klein] 4B and $0.211/1M for OpenAI: gpt-oss-120b. The comparison uses current catalog prices and updates as provider pricing changes.

Is FLUX.2 [klein] 4B or OpenAI: gpt-oss-120b faster?

Current measured p50 time to first token is not enough data for FLUX.2 [klein] 4B and 1399 ms for OpenAI: gpt-oss-120b. These are routed probe measurements, not vendor-advertised speeds, and update as new samples arrive.

Can I test FLUX.2 [klein] 4B 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 black-forest-labs/flux-2-klein-4b and openai/gpt-oss-120b. This makes side-by-side evals possible without maintaining two provider integrations.