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Model capability probe

Free Models Router | JSON mode

Whether Free Models Router supports JSON mode cannot be decided from the name alone. Check model ID openrouter/free, provider Openrouter, catalog params, modality, a lightweight runtime probe, and the error body together.

Model
openrouter/free
Free Models Router
Provider
Openrouter
3 models in catalog
Capability
JSON mode
json-mode
Catalog signal
catalog shows support
Context: 200,000
Capability probe summary
Model
openrouter/free
Capability
json-mode
Catalog signal
catalog shows support
Read-only check. Detection data burns after 5 minutes.
Read-only check. Detection data burns after 5 minutes.

How to judge this capability

Whether Free Models Router supports JSON mode cannot be decided from the name alone. Check model ID openrouter/free, provider Openrouter, catalog params, modality, a lightweight runtime probe, and the error body together.

  • Model: openrouter/free
  • Provider: Openrouter
  • 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 openrouter/free; 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

Free Models Router 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: 200,000