Which LLM is the cheapest for our workload?

The best-for pages rank the live catalogue per task by the index that measures it, and the router picks the cheapest model that meets your quality rule for each request.

How much can we save on our LLM bill?

On the public benchmark the router saved 89% against sending everything to the reference model. Import last month's provider bill on the bill page and the estimate is computed on your own traffic before you change a line of code.

How often do model prices change?

The catalogue is refreshed from the vendors' price lists; each model page shows the date of its data.

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OpenSmartRoute

Step 3.5 Flash by StepFun: pricing, context window and specs - OpenSmartRoute

Model catalogue

StepFun

Step 3.5 Flash

stepfun/step-3.5-flashCatalogue: Indexed in the reference catalogue; nothing on this deployment answers as this model yet.

JSON

Specification

Published by the vendor; the platform bills at the target's declared price.

Step 3.5 Flash

reasoning open weights tools

StepFun stepfun/step-3.5-flash

Step 3.5 Flash is StepFun's most capable open-source foundation model. Built on a sparse Mixture of Experts (MoE) architecture, it selectively activates only 11B of its 196B parameters per token....

Input $/1M

Alternatives, and where the router puts Step 3.5 Flash

Step 3.5 Flash earns a request when it needs step-by-step reasoning, tool calls, very long inputs; a short, general request would go to Nemotron 3.5 Super VL (free) instead - free per million input tokens against $0.10 here; and the hardest requests, where the quality floor rules it out, to Claude Opus 5.5 (batch). Your rules decide the floor; the trace shows the comparison for every request.

Cheaper alternatives

Lower input price and an intelligence index within 5 points.

On this deployment

Nothing on this deployment answers as this model yet. Connect your own provider under Model providers, or add a target to your catalogue - the router picks it up without retraining.

Not available here yet

Signed in, add the model under Model providers; self-hosting, add a target with metadata.model set to this id.

targets.yamlyaml

# targets.yaml - declare a target that runs Step 3.5 Flash
targets:
  - id: step-3-5-flash
    kind: llm
    name: Step 3.5 Flash
    metadata:
      model: stepfun/step-3.5-flash          # links the target to this catalogue entry
    capabilities:
      domains: [general]
      supports_tools: true
      context_window: 262144
    cost:
      usd_per_1k_tokens: 0.000200

Price among StepFun models

Input list price per million tokens; Step 3.5 Flash is the cheapest of 3 listed.

1
Step 3.5 Flash
$0.10
2
Step 3.7 Flash
$0.20
3
Step 5 Preview
$1.00

More from StepFun

Other models by the same vendor in the catalogue.

List price is where the decision starts

Step 3.5 Flash earns a request when it beats the field on your objective, not on the vendor's page.

The specification above is what StepFun publishes. What the router uses is the price you actually pay here, the latency measured on this deployment and the outcomes people reported - and it compares those against every other model that could take the request. Price a workload on the estimator, or send one live in the playground.

Photo: RDNE Stock project

For the business

What it means for which models you pay for.

Catalogue of every vendor
The right model, not the famous one
Price, context, abilities and benchmark indexes side by side, with the model that fits each task named.
The rankings
89% less
Lower cost per request
On the 150-prompt benchmark the router spent 89% less than sending every prompt to the reference model, and the judged quality went up, not down.
Read the benchmark
Per million tokens, every model
Prices you can compare

Specification

Step 3.5 Flash

Alternatives, and where the router puts Step 3.5 Flash

Cheaper alternatives

On this deployment

Price among StepFun models

More from StepFun

Step 3.5 Flash earns a request when it beats the field on your objective, not on the vendor's page.

What it means for which models you pay for.

The right model, not the famous one

Lower cost per request

Prices you can compare

Better alternatives