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OpenAI: gpt-oss-120b vs stepfun-ai/Step-5-Preview

Try both on us. Starter credit covers your first requests, then one key routes gpt-oss-120b and stepfun-ai/Step-5-Preview. 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

gpt-oss-120b has the lower published input-plus-output rate and more Credits provider routes. stepfun-ai/Step-5-Preview has the larger context window. There is not enough recent probe data to compare speed.

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

$3.9035/1Mstepfun-ai/Step-5-Preview cheapest route

1033 msOpenAI: gpt-oss-120b fastest measured p50 TTFT via cerebras

not enough datastepfun-ai/Step-5-Preview fastest measured p50 TTFT

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.

OpenAI: gpt-oss-120bstepfun-ai/Step-5-Preview

Model idopenai/gpt-oss-120bstepfun-ai/step-5-preview

Publisher OpenAI StepFun

AI IQ IQ 98#132 —

Context131,072 tokens1,048,576 tokens

Credits provider routes243

Cheapest route$0.211/1M$3.9035/1M

Cached input$0.015825/1M to $0.1055/1M$0.05275/1M

Privacy posturehas Confidential route (E2EE + ZDR)provider posture varies

Fastest measured p50 TTFT1033 ms via cerebrasnot enough data

Highest measured throughput132 tok/s via amazon-bedrocknot enough data

Recent route uptime range88.31% to 100.00%100.00%

Modes chat chat

OpenAI: gpt-oss-120b routes

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

stepfun-ai/Step-5-Preview routes

Overview3 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="openai/gpt-oss-120b",
    messages=messages,
)

Questions

Which should I use, OpenAI: gpt-oss-120b or stepfun-ai/Step-5-Preview?

Is OpenAI: gpt-oss-120b or stepfun-ai/Step-5-Preview cheaper?

The current cheapest TrustedRouter route is $0.211/1M for OpenAI: gpt-oss-120b and $3.9035/1M for stepfun-ai/Step-5-Preview. The comparison uses current catalog prices and updates as provider pricing changes.

Is OpenAI: gpt-oss-120b or stepfun-ai/Step-5-Preview faster?

Current measured p50 time to first token is 1033 ms for OpenAI: gpt-oss-120b and not enough data for stepfun-ai/Step-5-Preview. These are routed probe measurements, not vendor-advertised speeds, and update as new samples arrive.

Can I test OpenAI: gpt-oss-120b and stepfun-ai/Step-5-Preview with the same API?

Yes. Use the same OpenAI-compatible TrustedRouter base URL and API key, then change only the model id between openai/gpt-oss-120b and stepfun-ai/step-5-preview. This makes side-by-side evals possible without maintaining two provider integrations.