tokevenGemini · Mid-tier · 1.0M context window
Gemini 3.1 Pro pricing for chain of thought
$0.0660 per call at 3,000 input / 5,000 output tokens.
Per call
$0.0660
10K calls/mo
$660
Cache savings
90% off input
Batch savings
50% off all
Calculate your Gemini 3.1 Pro costs
Adjust token counts, volume, and discount toggles to model your chain of thought spend. Prices verified daily against provider pricing pages.
Configure your usage
Estimated cost
Quick start
Call Gemini 3.1 Pro with the Google Generative AI SDK:
import google.generativeai as genai
model = genai.GenerativeModel("gemini-3.1-pro")
response = model.generate_content("Your prompt here")
# Cost: ~$0.0660 per call at standard rates
# Input: $2.00/MTok
# Output: $12.00/MTokHow Gemini 3.1 Pro compares on cost
Per-call cost for all models scoring 50+ on chain of thought benchmarks. Hover for details.
Cheapest viable option: GPT 5.6 Luna at $0.006600/call (90% less, 86/100 quality).
What drives chain of thought cost
Reasoning tasks invert the usual ratio: the model produces far more tokens than it consumes, because the intermediate steps are the work. Output pricing dominates completely, and models that reason at length cost more than their headline rate suggests. Comparing reasoning models on input price is actively misleading; compare them on output.
For Gemini 3.1 Pro specifically, that means output tokens cost 6.0x more than input, at $12.00 vs $2.00 per MTok. At this use case’s 3,000/5,000 token split, output accounts for 91% of the $0.0660 per-call cost.
Complete Gemini 3.1 Pro pricing breakdown
Standard token rates
| Direction | $/MTok | Tokens per call |
|---|---|---|
| Input | $2.00 | 3,000 |
| Output | $12.00 | 5,000 |
Prompt caching: 90% off input tokens
Caching drops input cost from $2.00 to $0.20/MTok. For repeated system prompts, that saves $0.005400 per call.
Batch API: 50% off all tokens
Submit requests asynchronously and receive 50% off all token costs. This works best for offline pipelines where latency requirements are flexible.
Monthly cost projections
| Monthly volume | Cost per call | Standard monthly | Cached monthly | You save with caching |
|---|---|---|---|---|
| 10,000 calls | $0.0660 | $660 | $606 | $54 |
| 50,000 calls | $0.0660 | $3,300 | $3,030 | $270 |
| 100,000 calls | $0.0660 | $6,600 | $6,060 | $540 |
| 500,000 calls | $0.0660 | $33,000 | $30,300 | $2,700 |
| 1,000,000 calls | $0.0660 | $66,000 | $60,600 | $5,400 |
Gemini 3.1 Pro quality benchmarks for chain of thought
Gemini 3.1 Pro is a solid pick for chain of thought
Scores 84/100 (rank #22 of 88). Good balance of quality and cost for chain of thought.
Top-ranked: GPT 6 Astra (93/100) at $0.2800/call
Performance across all task types
Gemini 3.1 Pro scores by task type. Chain of Thought highlighted.
| Task type | Confidence score | Rank out of 88 |
|---|---|---|
| Q&A | 87/100 | #4 |
| Classification | 86/100 | #3 |
| Code Review | 84/100 | #4 |
| Reasoning(current page) | 84/100 | #22 |
| Summarization | 80/100 | #2 |
| Creative Writing | 77/100 | #7 |
| Extraction | 75/100 | #5 |
| Code Generation | 57/100 | #24 |
Confidence scores are a third-party benchmark snapshot from week 26 of 2026. This snapshot is 17 weeks old, so treat the scores as directional and validate against your own evals.
Alternative models for chain of thought
21 models score 80+ on chain of thought benchmarks, sorted by input rate. Cheapest: GPT 5.6 Luna (90% less, 86/100 quality).
| Model | Provider | Input $/MTok | Output $/MTok | Quality | Per call | vs Gemini |
|---|---|---|---|---|---|---|
| GPT 5.6 Luna | GPT | $0.20 | $1.20 | 86/100 | $0.006600 | 90% cheaper |
| Gemini 3.6 Flash | Gemini | $0.75 | $3.75 | 85/100 | $0.0210 | 68% cheaper |
| Gemini 3.7 Flash | Gemini | $0.75 | $3.75 | 88/100 | $0.0210 | 68% cheaper |
| Gemini 3.8 Flash | Gemini | $0.75 | $3.75 | 89/100 | $0.0210 | 68% cheaper |
| Claude Sonnet 5 | Claude | $2.00 | $10.00 | 89/100 | $0.0560 | 15% cheaper |
| GPT 5.6 Terra | GPT | $2.00 | $12.00 | 91/100 | $0.0660 | same cost |
| GPT 6 Sol | GPT | $2.00 | $10.00 | 89/100 | $0.0560 | 15% cheaper |
| Grok 4.6 | Grok | $2.00 | $6.00 | 91/100 | $0.0360 | 45% cheaper |
| Grok 4.5 | Grok | $2.00 | $6.00 | 87/100 | $0.0360 | 45% cheaper |
| GPT 5.4 | GPT | $2.50 | $15.00 | 88/100 | $0.0825 | 25% more |
| Claude Sonnet 4.6 | Claude | $3.00 | $15.00 | 85/100 | $0.0840 | 27% more |
| Claude Opus 5.5 | Claude | $4.00 | $20.00 | 92/100 | $0.1120 | 70% more |
| GPT 5.6 Sol | GPT | $4.00 | $20.00 | 92/100 | $0.1120 | 70% more |
| Claude Opus 4.8 | Claude | $5.00 | $25.00 | 89/100 | $0.1400 | 112% more |
| Claude Opus 5 | Claude | $5.00 | $25.00 | 91/100 | $0.1400 | 112% more |
| Claude Opus 4.7 | Claude | $5.00 | $25.00 | 87/100 | $0.1400 | 112% more |
| Claude Opus 4.6 | Claude | $5.00 | $25.00 | 89/100 | $0.1400 | 112% more |
| GPT 5.5 | GPT | $5.00 | $30.00 | 90/100 | $0.1650 | 150% more |
| Claude Fable 5.1 | Claude | $10.00 | $50.00 | 92/100 | $0.2800 | 324% more |
| Claude Fable 5 | Claude | $10.00 | $50.00 | 90/100 | $0.2800 | 324% more |
| GPT 6 Astra | GPT | $10.00 | $50.00 | 93/100 | $0.2800 | 324% more |
About Gemini 3.1 Pro
Provider
Gemini
Tier
Mid-tier
Context
1.0M tokens
Released
Apr 2026
Other models from Gemini
| Model | Tier | Input $/MTok | Output $/MTok | Context |
|---|---|---|---|---|
| Gemini 3.5 Flash | Fast / Budget | $1.50 | $9.00 | 1.0M |
| Gemini 3 Flash | Fast / Budget | $0.50 | $3.00 | 1.0M |
| Gemini 3.5 Flash-Lite | Fast / Budget | $0.30 | $2.50 | 1.0M |
| Gemini 2.5 Computer Use | Fast / Budget | $1.25 | $10.00 | 128K |
| Gemini 2.5 Flash | Fast / Budget | $0.30 | $2.50 | 1.0M |
| Gemini 2.5 Flash-Lite | Fast / Budget | $0.10 | $0.40 | 1.0M |
| Gemini 2.5 Pro | Mid-tier | $1.25 | $10.00 | 1.0M |
| Gemini 3.1 Flash-Lite | Fast / Budget | $0.25 | $1.50 | 1.0M |
| Gemini 3.1 Pro Custom Tools | Mid-tier | $2.00 | $12.00 | 1.0M |
| Gemini 3.6 Flash | Fast / Budget | $0.75 | $3.75 | 1.0M |
| Gemini 3.7 Flash | Fast / Budget | $0.75 | $3.75 | 1.0M |
| Gemini 3.8 Flash | Fast / Budget | $0.75 | $3.75 | 1.0M |
| Gemini Omni 1.1 Flash | Fast / Budget | $1.50 | $9.00 | 1.0M |
| Gemini Omni Flash | Fast / Budget | $1.50 | $9.00 | 1.0M |
| Gemini Robotics ER 2 | Fast / Budget | $1.00 | $5.00 | 131K |
You can compare Gemini 3.1 Pro head-to-head against any other model on our model comparison pages, or track how pricing has changed over time on the pricing history tracker.
Gemini 3.1 Pro pricing for other use cases
See how Gemini 3.1 Pro costs change across different workload types.
Code Generation
$0.0520/call
Unit Test Generation
$0.0660/call
SQL Generation
$0.0150/call
API Generation
$0.0780/call
Code Refactoring
$0.0560/call
Code Review
$0.0340/call
PR Review
$0.0520/call
Security Review
$0.0420/call
Bug Detection
$0.0340/call
Document Summarization
$0.0320/call
PDF Summarization
$0.0480/call
Meeting Notes
$0.0400/call
Email Summarization
$0.0120/call
Chatbot
$0.0160/call
RAG Pipeline
$0.0300/call
Customer Support Bot
$0.0180/call
FAQ Bot
$0.0126/call
Data Extraction
$0.0200/call
JSON Extraction
$0.0156/call
Invoice Parsing
$0.0112/call
Resume Parsing
$0.0146/call
Legal Analysis
$0.0680/call
Math Reasoning
$0.0390/call
Financial Analysis
$0.0640/call
Content Moderation
$0.002200/call
Sentiment Analysis
$0.002200/call
Categorization
$0.003400/call
Intent Detection
$0.001800/call
Copywriting
$0.0250/call
Blog Writing
$0.0980/call
Marketing Copy
$0.0376/call
Product Descriptions
$0.0190/call
Related pages
Frequently asked questions
How much does Gemini 3.1 Pro cost for chain of thought per API call?
A typical chain of thought call using Gemini 3.1 Pro costs about $0.0660 per call. This estimate uses 3,000 input tokens and 5,000 output tokens at standard rates. Standard rates are $2.00 per million input tokens and $12.00 per million output tokens.
Is Gemini 3.1 Pro the best model for chain of thought?
Gemini 3.1 Pro scores 84 out of 100 on chain of thought benchmarks overall. It ranks #22 across all 88 models in our cross-provider registry. The highest-ranked model for this task is GPT 6 Astra from GPT. That model scores 93/100 on this task type. Confidence scores are a third-party benchmark snapshot from week 26 of 2026. This snapshot is 17 weeks old, so treat the scores as directional and validate against your own evals.
What is the cheapest model for chain of thought with good quality?
The most affordable model for chain of thought above 80/100 quality is GPT 5.6 Luna. It comes from GPT at $0.20 per million input tokens. Output costs $1.20 per million tokens with a quality score of 86/100. Switching from Gemini 3.1 Pro to GPT 5.6 Luna saves about 90% per API call.
How can I reduce my Gemini 3.1 Pro costs for chain of thought?
Three strategies lower Gemini 3.1 Pro costs for this task type effectively. Prompt caching gives a 90% discount on input tokens when reusing system prompts. The batch API gives 50% off all tokens for asynchronous processing workloads. Prompt optimization reduces token counts through more concise instructions and context windows. Combining caching with batching brings your cost from $0.0660 to about $0.003300 per call.
How does Gemini 3.1 Pro pricing compare to other Gemini models?
Gemini has 15 other models alongside Gemini 3.1 Pro today: Gemini 3.5 Flash at $1.50/$9.00 per million tokens (fast / budget), Gemini 3 Flash at $0.50/$3.00 per million tokens (fast / budget), Gemini 3.5 Flash-Lite at $0.30/$2.50 per million tokens (fast / budget), Gemini 2.5 Computer Use at $1.25/$10.00 per million tokens (fast / budget), Gemini 2.5 Flash at $0.30/$2.50 per million tokens (fast / budget), Gemini 2.5 Flash-Lite at $0.10/$0.40 per million tokens (fast / budget), Gemini 2.5 Pro at $1.25/$10.00 per million tokens (mid-tier), Gemini 3.1 Flash-Lite at $0.25/$1.50 per million tokens (fast / budget), Gemini 3.1 Pro Custom Tools at $2.00/$12.00 per million tokens (mid-tier), Gemini 3.6 Flash at $0.75/$3.75 per million tokens (fast / budget), Gemini 3.7 Flash at $0.75/$3.75 per million tokens (fast / budget), Gemini 3.8 Flash at $0.75/$3.75 per million tokens (fast / budget), Gemini Omni 1.1 Flash at $1.50/$9.00 per million tokens (fast / budget), Gemini Omni Flash at $1.50/$9.00 per million tokens (fast / budget), Gemini Robotics ER 2 at $1.00/$5.00 per million tokens (fast / budget). The right choice depends on whether your chain of thought workload prioritizes quality, cost, or speed.
What context window does Gemini 3.1 Pro support?
Gemini 3.1 Pro supports a context window of 1.0M tokens per API call. This sets the maximum combined length of your input prompt and generated response. For chain of thought, typical calls use 3,000 input and 5,000 output tokens. That is well within this limit, leaving room for longer prompts or multi-turn conversations.
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