tokevenGemini 3.1 Pro Custom Tools
Gemini 3.1 Pro Custom Tools is Gemini's balanced performance model, priced at $2.00/MTok input and $12.00/MTok output with a 1,048.576K context window. Backfilled on 2026-09-23. Prices confirmed by the provider pricing page and the LiteLLM cross-check. Release date not published in a machine-readable source. Not yet benchmarked, so never recommended.
Input $/MTok
$2.00
Output $/MTok
$12.00
Context window
1,048.576K
Cache read discount
90% off
Gemini 3.1 Pro Custom Tools pricing breakdown
| Rate | Input $/MTok | Output $/MTok |
|---|---|---|
| Standard | $2.00 | $12.00 |
| Cached read (90% off input) | $0.20 | - |
| Cached write (no surcharge) | $2.00 | - |
| Batch (50% off) | $1.00 | $6.00 |
| Long context (≥200.001K tokens) | $4.00 | $18.00 |
All rates in USD per million tokens. Prices verified against provider documentation.
Gemini 3.1 Pro Custom Tools task benchmarks
Confidence scores (0-100) and cross-provider rank for each task type. Rank 1 is best across all 72 models.
Not benchmarked. The third-party benchmark source used for confidence scores does not cover Gemini models yet. Scores will appear here once independent benchmarks are published.
Gemini 3.1 Pro Custom Tools cost by use case
Estimated cost per API call using default token counts for each workload.
| Use case | Input tokens | Output tokens | Cost / call |
|---|---|---|---|
| Code Generation | 2,000 | 4,000 | $0.0520 |
| Unit Test Generation | 3,000 | 5,000 | $0.0660 |
| SQL Generation | 1,500 | 1,000 | $0.0150 |
| API Generation | 3,000 | 6,000 | $0.0780 |
| Code Refactoring | 4,000 | 4,000 | $0.0560 |
| Code Review | 5,000 | 2,000 | $0.0340 |
| PR Review | 8,000 | 3,000 | $0.0520 |
| Security Review | 6,000 | 2,500 | $0.0420 |
| Bug Detection | 5,000 | 2,000 | $0.0340 |
| Document Summarization | 10,000 | 1,000 | $0.0320 |
| PDF Summarization | 15,000 | 1,500 | $0.0480 |
| Meeting Notes | 8,000 | 2,000 | $0.0400 |
Monthly cost projections
Projected monthly spend at different call volumes, using code generation as a representative workload (2,000 input / 4,000 output tokens per call).
| Calls / month | Without caching | With caching (90% read discount) |
|---|---|---|
| 1K | $52 | $49.48 |
| 10K | $520 | $494.8 |
| 100K | $5,200 | $4,948 |
| 500K | $26,000 | $24,740 |
| 1M | $52,000 | $49,480 |
Caching estimate assumes 70% of input tokens are cache reads. Your actual cache hit rate will depend on prompt structure and reuse.
Mid-tier alternatives to Gemini 3.1 Pro Custom Tools
Same-tier models from other providers, sorted by input price.
| Model | Provider | Input $/MTok | Output $/MTok | Input savings |
|---|---|---|---|---|
| GPT 5 | GPT | $1.25 | $10.00 | 38% cheaper |
| GPT 5.1 | GPT | $1.25 | $10.00 | 38% cheaper |
| Grok 4.3 | Grok | $1.25 | $2.50 | 38% cheaper |
| Grok 4.20 Non-Reasoning | Grok | $1.25 | $2.50 | 38% cheaper |
| Grok 4.20 Reasoning | Grok | $1.25 | $2.50 | 38% cheaper |
| Grok 4.20 Multi-Agent | Grok | $1.25 | $2.50 | 38% cheaper |
| GPT 5.2 | GPT | $1.75 | $14.00 | 13% cheaper |
| Claude Sonnet 5 | Claude | $2.00 | $10.00 | Same price |
| GPT 5.6 Terra | GPT | $2.00 | $12.00 | Same price |
| GPT 4.1 | GPT | $2.00 | $8.00 | Same price |
| o3 | GPT | $2.00 | $8.00 | Same price |
| GPT 5.4 | GPT | $2.50 | $15.00 | 25% more |
| GPT 4o | GPT | $2.50 | $10.00 | 25% more |
| Claude Sonnet 4.6 | Claude | $3.00 | $15.00 | 50% more |
Other Gemini models
Gemini 2.5 Flash-Lite
Fast / Budget / $0.10 in / $0.40 out
Gemini 3.1 Flash-Lite
Fast / Budget / $0.25 in / $1.50 out
Gemini 3.5 Flash-Lite
Fast / Budget / $0.30 in / $2.50 out
Gemini 2.5 Flash
Fast / Budget / $0.30 in / $2.50 out
Gemini 3 Flash
Fast / Budget / $0.50 in / $3.00 out
Gemini 3.6 Flash
Fast / Budget / $0.75 in / $3.75 out
Gemini 3.7 Flash
Fast / Budget / $0.75 in / $3.75 out
Gemini 3.8 Flash
Fast / Budget / $0.75 in / $3.75 out
Gemini Robotics ER 2
Fast / Budget / $1.00 in / $5.00 out
Gemini 2.5 Computer Use
Fast / Budget / $1.25 in / $10.00 out
Gemini 2.5 Pro
Mid-tier / $1.25 in / $10.00 out
Gemini 3.5 Flash
Fast / Budget / $1.50 in / $9.00 out
Gemini Omni 1.1 Flash
Fast / Budget / $1.50 in / $9.00 out
Gemini Omni Flash
Fast / Budget / $1.50 in / $9.00 out
Gemini 3.1 Pro
Mid-tier / $2.00 in / $12.00 out
Track your Gemini 3.1 Pro Custom Tools spend
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