Gemini 3.1 Pro Preview vs Grok 4.6
Facts only. This page does not pick a winner. For a picked winner, see the use case comparison on Tools.
| Gemini 3.1 Pro Preview | Grok 4.6 | |
|---|---|---|
| API model IDs | gemini-3.1-pro-preview | grok-4.6 |
| Context window | 1,048,576 | 500,000 |
| Lifecycle | active | active |
| License | proprietary | proprietary |
| Trains on API data | No | No |
| Zero data retention | on-request | yes |
| Input per 1M tokens | $2 (verified 2026-09-08) | $2 (verified 2026-09-08) |
Frequently asked questions
- Which has the larger context window, Gemini 3.1 Pro Preview or Grok 4.6?
- Gemini 3.1 Pro Preview holds 1,048,576 tokens and Grok 4.6 holds 500,000. Gemini 3.1 Pro Preview holds more. The context window counts the prompt, any attached files, and the reply together.
- Which is cheaper, Gemini 3.1 Pro Preview or Grok 4.6?
- Per million input tokens, Gemini 3.1 Pro Preview was $2 (verified 2026-09-08) and Grok 4.6 was $2 (verified 2026-09-08). Input pricing is the same on both. Output tokens cost $12 and $6 respectively, and output volume usually decides the bill.
- Does Gemini 3.1 Pro Preview or Grok 4.6 train on API data?
- Gemini 3.1 Pro Preview does not train on API data by default, and Grok 4.6 does not train on API data by default. Zero data retention is on-request for Gemini 3.1 Pro Preview and yes for Grok 4.6. Verified 2026-09-08 and 2026-09-08 against the providers' own documentation.
- Is Gemini 3.1 Pro Preview or Grok 4.6 being retired?
- Gemini 3.1 Pro Preview is active. Grok 4.6 is active. Lifecycle checked 2026-09-08 and 2026-09-08. Pin a dated snapshot ID rather than an alias if a retirement would break you.