Gemini 3.1 Pro Preview (Custom Tools)
gemini The API that serves this model and sets the prices shown here. gemini-3.1-pro-preview-customtools The model identifier to send in API requests. LLM Generates text from a prompt, so it can be compared with other LLMs on price and capability. Medium The balanced tier of a model family, trading some capability for speed and cost.Provider: google
Knowledge cutoff: January 2025
Nothing to act on today. The cost is the checking: someone has to remember to look again next month, and the month after. Coolhand watches this model for you and automatically updates your agents to the most compatible replacement the moment a retirement is announced — one less thing on your list, permanently.
Sticker prices & cost-per-token
List rates as published by google, before any volume or enterprise discounts.
$2.00
$12.00
1,048,576 tokens
65,536
tokens per response (includes reasoning tokens)
Closed weights
$1.00 / $6.00
$0.20
Get this data free
Want to stay updated on price changes on this model? Pull this data free (no API key required) here:
curl "https://coolhandlabs.com/api/v2/inference_apis?q%5Bmodel_eq%5D=gemini-3.1-pro-preview-customtools&q%5Bsource_api_eq%5D=gemini"Pricing History
| Effective | Price |
|---|---|
| May 28, 2026 – present | Input cost: $2.00 / 1M, Output cost: $12.00 / 1M, Batch input cost: $1.00 / 1M, Batch output cost: $6.00 / 1M, Cached input cost: $0.20 / 1M, Cache creation cost: $0.00 / 1M, 5-minute cache write cost: $0.00 / 1M, 1-hour cache write cost: $0.00 / 1M, Reasoning output cost: $0.00 / 1M, Cache storage cost: $0.00 / 1M/hr |
History
No automated scan changes recorded yet.
| Date | Changed by | What changed |
|---|---|---|
| May 28, 2026 | Unknown | Initial record created |
Source
https://ai.google.dev/gemini-api/docs/pricingComparable models
No comparable models identified yet.
Reliability
No reliability incidents recorded in the last 90 days.
Frequently asked questions
Gemini 3.1 Pro Preview (Custom Tools) (google) costs $2.00 per 1M input tokens and $12.00 per 1M output tokens, as last published by google.
Gemini 3.1 Pro Preview (Custom Tools) has a context window of 1,048,576 tokens (the maximum combined input and output it can handle in a single request).
Gemini 3.1 Pro Preview (Custom Tools) sits in the medium size tier. Size tiers run from micro (small enough to run on a device) through small, medium and large to extra large (frontier flagships), and are assigned from the model's family, naming and limits rather than its price.
Gemini 3.1 Pro Preview (Custom Tools) can generate up to 65,536 tokens in a single response. Reasoning (thinking) tokens count toward this limit.
Gemini 3.1 Pro Preview (Custom Tools)'s training data runs through January 2025, so it may not know about later events. Coolhand records the cutoff at month precision, since providers often publish only the month.
Gemini 3.1 Pro Preview (Custom Tools) accepts audio, image, pdf, text, and video as input and produces text as output, as recorded in the Coolhand catalog.
No — the weights of Gemini 3.1 Pro Preview (Custom Tools) have not been released, so it is only available through hosted APIs.
No, Gemini 3.1 Pro Preview (Custom Tools) is currently active with no announced deprecation date.
Call GET https://coolhandlabs.com/api/v2/inference_apis?q[source_api_eq]=gemini&q[model_eq]=gemini-3.1-pro-preview-customtools — free, no API key required, and scoped to just this model since source_api and model together are unique. See https://coolhandlabs.com/docs for the full REST API reference.
Coolhand also tracks Gemini 3.1 Flash Lite Preview, Google Gemma 3 12B, Gemma 3 4B IT, Deep Research Max Preview (Apr-21-2026), Deep Research Preview (Apr-21-2026), and Gemini 2.5 Flash from google. Some may already be deprecated, so check each model's status alongside its current pricing.
| Model | Input cost | Output cost | Context window | Max output tokens | Status |
|---|---|---|---|---|---|
| Gemini 3.1 Flash Lite Preview | $0.25/1M $0.0000002500 | $1.50/1M $0.0000015000 | 1,048,576 | 65,536 |
Deprecated Aug 13, 2026
|
| Google Gemma 3 12B via Bedrock | $0.09/1M $0.0000000900 | $0.29/1M $0.0000002900 | 131,072 | 8,192 | Active |
| Gemma 3 4B IT via Bedrock | $0.04/1M $0.0000000400 | $0.08/1M $0.0000000800 | 131,072 | 4,096 | Active |
| Deep Research Max Preview (Apr-21-2026) | $2.00/1M $0.0000020000 | $12.00/1M $0.0000120000 | — | 65,536 | Active |
| Deep Research Preview (Apr-21-2026) | $2.00/1M $0.0000020000 | $12.00/1M $0.0000120000 | — | 65,536 | Active |
| Gemini 2.5 Flash | $0.30/1M $0.0000003000 | $2.50/1M $0.0000025000 | 1,048,576 | 65,536 | Active |
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