Model capability probe

StepFun: Step 3.5 Flash | JSON mode

Whether StepFun: Step 3.5 Flash supports JSON mode cannot be decided from the name alone. Check model ID stepfun/step-3.5-flash, provider StepFun AI, catalog params, modality, a lightweight runtime probe, and the error body together.

Model

stepfun/step-3.5-flash

StepFun: Step 3.5 Flash

Provider

StepFun AI

1 models in catalog

Capability

JSON mode

json-mode

Catalog signal

catalog shows support

Context: 262,144

Capability probe summary

Model

stepfun/step-3.5-flash

Capability

json-mode

Catalog signal

catalog shows support

Read-only check. Detection data burns after 5 minutes.

How to judge this capability

Whether StepFun: Step 3.5 Flash supports JSON mode cannot be decided from the name alone. Check model ID stepfun/step-3.5-flash, provider StepFun AI, catalog params, modality, a lightweight runtime probe, and the error body together.

Model: stepfun/step-3.5-flash
Provider: StepFun AI
Capability: JSON mode

How to prove it during checking

Read-only check. Detection data burns after 5 minutes.

Start with the catalog signal: catalog shows support, then verify with a real key in read-only mode.
The capability probe must bind model ID stepfun/step-3.5-flash; do not test another model from the same provider.
JSON mode · supports frequency_penalty · supports include_reasoning · supports max_tokens · supports min_p

Next action

StepFun: Step 3.5 Flash JSON mode should turn into an operator action: confirm sale tags, fill the capability matrix, change route, suggest a fallback model, or mark unsupported for now.

Read-only check. Detection data burns after 5 minutes.
Catalog signal: catalog shows support
Context: 262,144

Open key checker

Read-only check. Detection data burns after 5 minutes.

Open models

StepFun: Step 3.5 Flash

Open providers

StepFun AI