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Meta: Llama 3.1 8B Instruct vs stepfun-ai/Step-5-Preview

Try both on us. Starter credit covers your first requests, then one key routes Llama 3.1 8B Instruct 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

Meta: Llama 3.1 8B Instruct has the lower published input-plus-output rate, more Credits provider routes and the lower measured p50 time to first token. stepfun-ai/Step-5-Preview has the larger context window.

$0.07385/1MMeta: Llama 3.1 8B Instruct cheapest route

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

930 msMeta: Llama 3.1 8B Instruct fastest measured p50 TTFT via wandb

2019 msstepfun-ai/Step-5-Preview fastest measured p50 TTFT via nvidia-nim

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.

Meta: Llama 3.1 8B Instructstepfun-ai/Step-5-Preview

Model idmeta-llama/llama-3.1-8b-instructstepfun-ai/step-5-preview

Publisher Meta StepFun

AI IQ — —

Context131,072 tokens1,048,576 tokens

Credits provider routes53

Cheapest route$0.07385/1M$3.9035/1M

Cached input$0.211/1M$0.05275/1M

Privacy posturehas ZDR routeprovider posture varies

Fastest measured p50 TTFT930 ms via wandb2019 ms via nvidia-nim

Highest measured throughputnot enough datanot enough data

Recent route uptime range100.00%60.00% to 100.00%

Modes chat chat

Meta: Llama 3.1 8B Instruct routes

Overview5 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="meta-llama/llama-3.1-8b-instruct",
    messages=messages,
)

Questions

Which should I use, Meta: Llama 3.1 8B Instruct or stepfun-ai/Step-5-Preview?

Is Meta: Llama 3.1 8B Instruct or stepfun-ai/Step-5-Preview cheaper?

The current cheapest TrustedRouter route is $0.07385/1M for Meta: Llama 3.1 8B Instruct and $3.9035/1M for stepfun-ai/Step-5-Preview. The comparison uses current catalog prices and updates as provider pricing changes.

Is Meta: Llama 3.1 8B Instruct or stepfun-ai/Step-5-Preview faster?

Current measured p50 time to first token is 930 ms for Meta: Llama 3.1 8B Instruct and 2019 ms for stepfun-ai/Step-5-Preview. These are routed probe measurements, not vendor-advertised speeds, and update as new samples arrive.

Can I test Meta: Llama 3.1 8B Instruct 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 meta-llama/llama-3.1-8b-instruct and stepfun-ai/step-5-preview. This makes side-by-side evals possible without maintaining two provider integrations.