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Gemini 3.1 Pro Preview versus Gemma 4 31B IT on price, context, and capabilities. Both are in the Google group. Costs use a shared reference workload. Prices from Models.dev. Data last refreshed Oct 16, 2026, 07:15 AM UTC.

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Gemini 3.1 Pro PreviewvsGemma 4 31B IT

Alphabetical by model id, so this URL is the one to index. Gemini 3.1 Pro Preview is google/gemini-3.1-pro-preview. Gemma 4 31B IT is google/gemma-4-31b-it. Both are among the models the most providers list, inside the Google group.

vs

100 requests a day, 2,000 input tokens and 500 output tokens, no cache hits. A light chat workload so the rate cards are comparable.
SpecGemini 3.1 Pro PreviewGemma 4 31B IT
Monthly, reference workload$30.00$1.44
Input / 1M$2.00$0.14
Output / 1M$12.00$0.40
Cache read / 1M$0.20—
Cache write / 1M——
Context1,048,576262,144
Max output65,53632,768
ReasoningYesYes
Tool callsYesYes
VisionYesYes
Open weightsNoYes
Providers2941
Released2026-02-192026-04-02

Same workload, your numbers

Prices are USD per 1M tokens. A month is 30 days. Cache hits use the cache-read rate when the model has one; otherwise the cache field is ignored.

Estimated monthly cost

Gemma 4 31B IT

$1.44

Cache hit is ignored because this model has no cache-read price.

Gemini 3.1 Pro Preview costs $28.56 more per month than Gemma 4 31B IT at these inputs.

monthly = requests/day × 30 × (input tokens × (1 − cache hit) × input price + input tokens × cache hit × cache-read price + output tokens × output price) ÷ 1,000,000