Model error diagnosis

Google: Gemini 3.1 Pro Preview | model capability unsupported

Google: Gemini 3.1 Pro Preview returning 400 / model capability unsupported means you should first confirm whether model ID google/gemini-3.1-pro-preview is visible for this Google key, then separate permission, context, capability, rate limit, or route issues.

Model

google/gemini-3.1-pro-preview

Google: Gemini 3.1 Pro Preview

Provider

Google

32 models in catalog

Error type

model capability unsupported

capability-unsupported

Status code

400

global model route

Model error summary

Model

google/gemini-3.1-pro-preview

Error type

capability-unsupported

Status code

400

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

What this model error usually means

Google: Gemini 3.1 Pro Preview returning 400 / model capability unsupported means you should first confirm whether model ID google/gemini-3.1-pro-preview is visible for this Google key, then separate permission, context, capability, rate limit, or route issues.

Model: google/gemini-3.1-pro-preview
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/gemini-3.1-pro-preview 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 1,048,576, input $2, output $12.
supports include_reasoning
supports max_tokens
supports reasoning
supports response_format

Next action

Google: Gemini 3.1 Pro Preview 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: 1,048,576
Price: $2 / $12
Read-only check. Detection data burns after 5 minutes.

Open key checker

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

Open models

Google: Gemini 3.1 Pro Preview

Open providers

Google