OpenAI compatible API · Attested · Public status

Qwen: Qwen3.8 27B vs Step 5 Preview

Qwen: Qwen3.8 27B vs Step 5 Preview: 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

Qwen: Qwen3.8 27B has the lower published input-plus-output rate, more Credits provider routes and the lower measured p50 time to first token. Step 5 Preview has the larger context window.

$0.385075/1MQwen: Qwen3.8 27B cheapest route

$1.33985/1MStep 5 Preview cheapest route

541 msQwen: Qwen3.8 27B fastest measured p50 TTFT via cerebras

2409 msStep 5 Preview fastest measured p50 TTFT via tencent

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.

Qwen: Qwen3.8 27BStep 5 Preview

Model idqwen/qwen3.8-27bstepfun/step-5-preview

Publisher Alibaba Cloud Model Studio StepFun

AI IQ IQ 116#48 —

Context65,536 tokens1,048,576 tokens

Credits provider routes161

Cheapest route$0.385075/1M$1.33985/1M

Cached input$0.015825/1M to $0.181988/1M$0.05275/1M

Privacy posturehas ZDR routeprovider posture varies

Fastest measured p50 TTFT541 ms via cerebras2409 ms via tencent

Highest measured throughputnot enough datanot enough data

Recent route uptime range100.00%100.00%

Modes chat chat

Qwen: Qwen3.8 27B routes

Overview16 Credits routes
PricingInput, cached input, and output rates
ProvidersAll serving providers

Step 5 Preview routes

Overview1 Credits routes

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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="qwen/qwen3.8-27b",
    messages=messages,
)

Questions

Which should I use, Qwen: Qwen3.8 27B or Step 5 Preview?

Qwen: Qwen3.8 27B has the lower published input-plus-output rate, more Credits provider routes and the lower measured p50 time to first token. Step 5 Preview has the larger context window.

Is Qwen: Qwen3.8 27B or Step 5 Preview cheaper?

The current cheapest TrustedRouter route is $0.385075/1M for Qwen: Qwen3.8 27B and $1.33985/1M for Step 5 Preview. The comparison uses current catalog prices and updates as provider pricing changes.

Is Qwen: Qwen3.8 27B or Step 5 Preview faster?

Current measured p50 time to first token is 541 ms for Qwen: Qwen3.8 27B and 2409 ms for Step 5 Preview. These are routed probe measurements, not vendor-advertised speeds, and update as new samples arrive.

Can I test Qwen: Qwen3.8 27B and 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 qwen/qwen3.8-27b and stepfun/step-5-preview. This makes side-by-side evals possible without maintaining two provider integrations.