OpenAI compatible API · Attested · Public status

Google: Gemini 3.1 Pro Preview vs Google: Gemma 4 31B

Google: Gemini 3.1 Pro Preview vs Google: Gemma 4 31B: compare current API pricing, context, provider routes, privacy, p50 latency, and OpenAI-compatible access.

Verify gateway

Onebase URL to migrate

100sof models and routes

0prompt or output logs. Always.

Compare routesProviders, price, context, and policy posture in one view.

Use auto when uptime mattersKeep a primary model and let fallback handle provider failures.

Same API shapeUse the OpenAI client and set the model you want.

Practical read

Monthly evidence

Google: Gemma 4 31B has the lower cheapest prompt+completion route on TrustedRouter. Google: Gemma 4 31B has more provider fallback routes, while Google: Gemini 3.1 Pro Preview has the larger context window. Current TrustedRouter probes show Google: Gemma 4 31B with the lower p50 TTFT.

$14.77/1MGoogle: Gemini 3.1 Pro Preview cheapest route

$0.4642/1MGoogle: Gemma 4 31B cheapest route

3943 msGoogle: Gemini 3.1 Pro Preview fastest measured p50 TTFT via google-vertex

1163 msGoogle: Gemma 4 31B fastest measured p50 TTFT via friendli

Prices and live route measurements can change. Use the monthly reports when you need a stable evidence window, then run a small task-specific eval before choosing a production default.

Google: Gemini 3.1 Pro PreviewGoogle: Gemma 4 31B

Model idgoogle/gemini-3.1-pro-previewgoogle/gemma-4-31b-it

Publisher Google AI Studio Google AI Studio

AI IQ IQ 129#8 IQ 103#80

Context1,048,576 tokens262,144 tokens

Credits provider routes414

Cheapest route$14.77/1M$0.4642/1M

Cached input$0.211/1M to $0.422/1M$0.03798/1M to $0.211/1M

Privacy posturehas ZDR routehas provider E2EE route

Fastest measured p50 TTFT3943 ms via google-vertex1163 ms via friendli

Highest measured throughput41 tok/s via lightningnot enough data

Recent route uptime range100.00%0.00% to 100.00%

Modes chat chat

Google: Gemini 3.1 Pro Preview routes

Overview4 Credits routes
PricingInput, cached input, and output rates
BenchmarksTrustedRouter and external sources
ProvidersAll serving providers

Google: Gemma 4 31B routes

Overview14 Credits routes
PricingInput, cached input, and output rates
ProvidersAll serving providers

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Production choice

Pick a default model. Keep fallback enabled.

TrustedRouter is useful when you know the model you want, but still need provider rollover, budget limits, usage records, and a prompt path you can verify.

OpenAI clientPython

client = OpenAI(
    base_url="https://api.trustedrouter.com/v1",
    api_key="sk-tr-v1-..."
)

response = client.chat.completions.create(
    model="google/gemini-3.1-pro-preview",
    messages=messages,
)

Questions

Which should I use, Google: Gemini 3.1 Pro Preview or Google: Gemma 4 31B?

Is Google: Gemini 3.1 Pro Preview or Google: Gemma 4 31B cheaper?

The current cheapest TrustedRouter route is $14.77/1M for Google: Gemini 3.1 Pro Preview and $0.4642/1M for Google: Gemma 4 31B. The comparison uses current catalog prices and updates as provider pricing changes.

Is Google: Gemini 3.1 Pro Preview or Google: Gemma 4 31B faster?

Current measured p50 time to first token is 3943 ms for Google: Gemini 3.1 Pro Preview and 1163 ms for Google: Gemma 4 31B. These are routed probe measurements, not vendor-advertised speeds, and update as new samples arrive.

Can I test Google: Gemini 3.1 Pro Preview and Google: Gemma 4 31B with the same API?

Yes. Use the same OpenAI-compatible TrustedRouter base URL and API key, then change only the model id between google/gemini-3.1-pro-preview and google/gemma-4-31b-it. This makes side-by-side evals possible without maintaining two provider integrations.