Model error diagnosis

Google: Gemma 3 4B | model capability unsupported

Google: Gemma 3 4B returning 400 / model capability unsupported means you should first confirm whether model ID google/gemma-3-4b-it is visible for this Google key, then separate permission, context, capability, rate limit, or route issues.

Model

google/gemma-3-4b-it

Google: Gemma 3 4B

Provider

Google

32 models in catalog

Error type

model capability unsupported

capability-unsupported

Status code

400

global model route

Model error summary

Model

google/gemma-3-4b-it

Error type

capability-unsupported

Status code

400

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

What this model error usually means

Google: Gemma 3 4B returning 400 / model capability unsupported means you should first confirm whether model ID google/gemma-3-4b-it is visible for this Google key, then separate permission, context, capability, rate limit, or route issues.

Model: google/gemma-3-4b-it
Provider: Google
Status code: 400

How to prove it during checking

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

List models: confirm whether google/gemma-3-4b-it is actually visible instead of guessing from the display name.
Light probe: use minimal input to verify whether Google returns the same 400, then record the error body.
Compare model facts: context 131,072, input $0.040, output $0.080.
supports frequency_penalty
supports max_tokens
supports min_p
supports presence_penalty

Next action

Google: Gemma 3 4B model capability unsupported should not end at failed. Return the next move: change model ID, add permission, reduce context, disable unsupported capability, change route, monitor, or hold listing.

Context: 131,072
Price: $0.040 / $0.080
Read-only check. Detection data burns after 5 minutes.

Open key checker

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