Gemini 3.1 Pro Preview
$666.00 / month- Input cost
- $546.00
- Output cost
- $120.00
- Per 1,000 calls
- $333.00
- Pricing profile
- standard
Source-tracked model comparison
Gemini 3.1 Pro Preview vs GPT-4o: how do long-context research costs compare?
Compare verified pricing and model limits for long-context research cost across Gemini Pro and GPT-4o. The cost example uses a long-context research workload and does not assume equal model quality.
Direct cost answer: Gemini 3.1 Pro Preview is estimated at $666.00 per month and GPT-4o at $812.50 for 150,000 input tokens, 5,000 output tokens, and 2,000 monthly requests. Gemini 3.1 Pro Preview is $146.50 lower under these assumptions. This does not identify a quality winner.
Tracked facts
Pricing and model limits
Prices are USD per 1M tokens under each model's verified default profile.
| Field | Gemini 3.1 Pro Preview | GPT-4o |
|---|---|---|
| Provider | OpenAI | |
| API model ID | gemini-3.1-pro-preview | gpt-4o |
| Input / 1M | $2.00 | $2.50 |
| Cached input / 1M | $0.20 | $1.25 |
| Output / 1M | $12.00 | $10.00 |
| Context window | 1,048,576 tokens | 128,000 tokens |
| Maximum output | 65,536 tokens | 16,384 tokens |
| Accepted input | text | text, image |
Example workload
Long-context research cost scenario
150,000 input and 5,000 output tokens per request, 2,000 monthly requests, and 10% cached input.
GPT-4o
$812.50 / month- Input cost
- $712.50
- Output cost
- $100.00
- Per 1,000 calls
- $406.25
- Pricing profile
- standard
Cost result: Gemini 3.1 Pro Preview is $146.50 lower per month for these assumptions. This is a price comparison, not a model-quality ranking.
Questions to answer before choosing
- Does the workload fit each tracked context window?
- How are citations and unsupported claims evaluated?
- Does preview status meet the deployment requirement?
What this estimate leaves out
Models whose tracked context window is below the scenario input are excluded from the compatible-model table.
Latency, reliability, output quality, retries, regional processing, and provider-specific tool charges can change the practical decision.
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