Gemini 3.1 Pro Preview Custom Tools
Google released 2026-02-25
No independent quality score.
No benchmark we track has measured this model. That is not the same as measuring it and finding it wanting — we simply cannot rank it, so we do not.
Every price dimension
| Input | $2.00/M |
|---|---|
| Output | $12.00/M |
| Cached input | $0.200/M |
| Cache write | $0.375/M |
| Reasoning | $12.00/M |
| Web search | $0.014/call |
Past 200,000 tokens the price changes. Input goes to $4.00/M (2×) and output to $18.00/M. The headline rate does not apply to a long-context workload.
Reasoning tokens are billed separately at $12.00/M, on top of output. On a reasoning-heavy workload this can be 40% of the bill and it does not appear in the advertised price.
Independent scores
No independent benchmark has measured this model.
Capability
| Context window | 1.0M |
|---|---|
| Max output | 66K |
| Input modes | text, audio, image, video, file |
| Tool use | yes |
| Reasoning | always on |
Provenance
| Price source | openrouter.ai |
|---|---|
| Fetched | 2026-08-24 |
| Quality data | unrated |
Gemini 3.1 Pro Preview Custom Tools is a variant of Gemini 3.1 Pro that improves tool selection behavior by preventing overuse of a general bash tool when more efficient third-party...