Gemini 3.1 Pro Preview Custom Tools
API ID gemini-3.1-pro-preview-customtools
gemini-3.1-pro-preview-customtools is a Google model, released February 2026. Standard price: from $2.00 input and from $12.00 output per 1M tokens.
Gemini 3.1 Pro Preview optimized for custom tool usage
- Status
- Active
- Released
- February 2026
- Shutdown
- none announced
- Replacement
- —
No deprecation or shutdown date has been announced as of October 15, 2026.
Benchmarks
Scores as each source published themComparing with Gemini 3 Pro Preview, the previous model in this line. A score is compared only with the same benchmark from the same source, at the same setting where both have it. Full comparison: prices, limits, features
Epoch AI
| Benchmark | Gemini 3.1 Pro Preview Custom Tools | Gemini 3 Pro Preview | Change | Setting | Run | Source |
|---|---|---|---|---|---|---|
| SWE-bench Verified | 75.6% | 72.9% | +2.7 pts | Feb 24, 2026 | source |
Run independently by Epoch AI. Data: Epoch AI, Capabilities & benchmarking (epoch.ai/benchmarks), CC BY.
Price history
USD per 1M tokens, standard tierWe started recording this model's prices on Oct 1, 2026. The history grows with each daily check.
Show as a table
| From | Type | Price |
|---|---|---|
| Oct 1, 2026 | Input | $2.00 |
| Oct 1, 2026 | Output | $12.00 |
Prices
USD per 1M tokens, every type and band, by tier| Type | Band | Price $/1M | In effect |
|---|---|---|---|
| Standard | |||
| input | up to 200k prompt | $2.00 | |
| input | over 200k prompt | $4.00 | |
| cached input | up to 200k prompt | $0.20 | |
| cached input | over 200k prompt | $0.40 | |
| output | up to 200k prompt | $12.00 | |
| output | over 200k prompt | $18.00 | |
| cache storage per hour | — | $4.50 | |
| Batch | |||
| input | up to 200k prompt | $1.00 | |
| input | over 200k prompt | $2.00 | |
| cached input | up to 200k prompt | $0.20 | |
| cached input | over 200k prompt | $0.40 | |
| output | up to 200k prompt | $6.00 | |
| output | over 200k prompt | $9.00 | |
| cache storage per hour | — | $4.50 | |
| Flex | |||
| input | up to 200k prompt | $1.00 | |
| input | over 200k prompt | $2.00 | |
| cached input | up to 200k prompt | $0.20 | |
| cached input | over 200k prompt | $0.40 | |
| output | up to 200k prompt | $6.00 | |
| output | over 200k prompt | $9.00 | |
| cache storage per hour | — | $4.50 | |
| Priority | |||
| input | up to 200k prompt | $3.60 | |
| input | over 200k prompt | $7.20 | |
| cached input | up to 200k prompt | $0.36 | |
| cached input | over 200k prompt | $0.72 | |
| output | up to 200k prompt | $21.60 | |
| output | over 200k prompt | $32.40 | |
| cache storage per hour | — | $8.10 | |
Changelog
Changes we detected on Google's pagesNo changes recorded yet.
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Last checked · Sources: Google deprecations, Google pricing, Google models, Google aliases, Google api models