Gemini 3.1 Flash Image Preview vs Gemini 3 Flash: API Cost Comparison
Compare the API pricing, context windows, features, and real-world cost projections for Gemini 3.1 Flash Image Preview (Google) and Gemini 3 Flash (Google). Use the interactive calculator below to compute your exact monthly cost based on your token usage and request volume.
Prices verified Mar 27, 2026
Interactive Cost Calculator
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Showing costs for 2 models. Cheapest: Gemini 3.1 Flash Image Preview at $20.00/month.
| Alert | |||||||
|---|---|---|---|---|---|---|---|
BestGemini 3.1 Flash Image Preview | $20.00 | $0.002000 | $5.00 | $15.00 | — | Alerts coming soon | |
Gemini 3 Flash | $20.00 | $0.002000 | $5.00 | $15.00 | — | Alerts coming soon |
Monthly Cost Comparison
Price Comparison at a Glance
All prices are in USD per 1 million tokens ($/M tokens). Lower is cheaper.
| Pricing Type | Gemini 3.1 Flash Image Preview | Gemini 3 Flash | Cheaper |
|---|---|---|---|
| Input (standard) | $0.50/M | $0.50/M | — |
| Output | $3.00/M | $3.00/M | — |
| Cached input | N/A | $0.05/M | — |
| Batch input | N/A | $0.25/M | — |
| Batch output | N/A | $1.50/M | — |
Prices last verified: 2026-03-08 – 2026-03-27
Cost Breakdown by Usage Volume
Estimated monthly costs at different request volumes, assuming 1,000 input tokens and 500 output tokens per request. Adjust in the calculator above for your specific use case.
| Volume | Gemini 3.1 Flash Image PreviewMonthly | Gemini 3 FlashMonthly | Gemini 3.1 Flash Image PreviewPer request | Gemini 3 FlashPer request |
|---|---|---|---|---|
| 1K requests/mo | $2.00 | $2.00 | $0.002000 | $0.002000 |
| 10K requests/mo | $20.00 | $20.00 | $0.002000 | $0.002000 |
| 100K requests/mo | $200.00 | $200.00 | $0.002000 | $0.002000 |
| 1M requests/mo | $2,000.00 | $2,000.00 | $0.002000 | $0.002000 |
Green values indicate the lower-cost option at each volume tier. Cost per request is calculated at 1,000 input + 500 output tokens using standard (non-batch, non-cached) pricing.
Price History
Input price per 1M tokensWhen to Choose Gemini 3.1 Flash Image Preview
by Google
- General chatbot
Input / 1M tokens
$0.50/M
Output / 1M tokens
$3.00/M
Context window
65,536
Tier
budget
When to Choose Gemini 3 Flash
by Google
- General chatbot
- Customer support
- Code generation
Input / 1M tokens
$0.50/M
Output / 1M tokens
$3.00/M
Context window
1,048,576
Tier
mid
Key Differences Beyond Price
Cost is only one factor in choosing an AI model. Context window size, rate limits, supported features, and latency all affect whether a model fits your use case.
| Capability | Gemini 3.1 Flash Image Preview | Gemini 3 Flash |
|---|---|---|
| Context window | 65,536 tokens | 1,048,576 tokens |
| Max output tokens | 65,536 tokens | 65,536 tokens |
| Performance tier | Budget | Mid |
| Vision / image input | Yes | Yes |
| Function calling | Yes | Yes |
| JSON mode | Yes | Yes |
| Prompt caching | No | Yes |
| Batch API (50% discount) | No | Yes |
| Extended reasoning | No | Yes |
| Fine-tuning | No | No |
| Rate limit (req/min) | Not published | 4,000 |
Gemini 3 Flash notes
Preview model. Thinking tokens available.
Frequently Asked Questions
Is Gemini 3.1 Flash Image Preview cheaper than Gemini 3 Flash?
Gemini 3.1 Flash Image Preview and Gemini 3 Flash cost the same at standard usage (1,000 input + 500 output tokens, 100K requests/month): $200.00/month each. For different token ratios, use the calculator above.
Which model has a larger context window, Gemini 3.1 Flash Image Preview or Gemini 3 Flash?
Gemini 3 Flash has a larger context window at 1,048,576 tokens, compared to 65,536 tokens for Gemini 3.1 Flash Image Preview. A larger context window is important for processing long documents, multi-turn conversations, or large codebases without truncation.
Do Gemini 3.1 Flash Image Preview and Gemini 3 Flash support the Batch API?
Gemini 3 Flash supports the Batch API (50% discount for async processing), while Gemini 3.1 Flash Image Preview does not. If your workload tolerates up to 24-hour latency, routing to Gemini 3 Flash with batch pricing could significantly cut costs versus Gemini 3.1 Flash Image Preview's standard rate.
Which model offers better prompt caching?
Gemini 3 Flash supports prompt caching at $0.05/M for cached input, while Gemini 3.1 Flash Image Preview does not offer prompt caching. For RAG applications or chatbots with large, repeated context, Gemini 3 Flash's caching capability can substantially reduce effective costs.
What are the best use cases for Gemini 3.1 Flash Image Preview vs Gemini 3 Flash?
Both models are well-suited for General chatbot. Gemini 3.1 Flash Image Preview is particularly strong for overlapping tasks. Gemini 3 Flash is favored for Customer support, Code generation. At the same quality level, the lower-cost model is usually preferable; use this page's calculator to compare total monthly spend at your volume.
What is the cost per request for Gemini 3.1 Flash Image Preview vs Gemini 3 Flash?
At 1,000 input tokens and 500 output tokens per request — a typical conversational workload — Gemini 3.1 Flash Image Preview costs $0.002000 per request and Gemini 3 Flash costs $0.002000 per request. At 100,000 requests/month, that translates to $200.00 and $200.00 respectively. Use the interactive calculator to adjust these parameters for your actual workload.
Gemini 3.1 Flash Image Preview vs Gemini 3 Flash: Summary
When comparing Gemini 3.1 Flash Image Preview and Gemini 3 Flash for API cost, the right choice depends on your workload's token profile, required features, and tolerance for latency. Both models cost the same at standard usage volumes (1,000 input + 500 output tokens per request at 100,000 requests/month) at $200.00/month.
Both models are priced in USD per million tokens, the standard unit across all major AI API providers. Gemini 3.1 Flash Image Preview charges $0.50/M for input tokens and $3.00/M for output tokens. Gemini 3 Flash charges $0.50/M input and $3.00/M output. If your workload is output-heavy (more tokens generated than consumed as input), the model with the lower output price compounds cost savings significantly at scale.
Prompt caching is supported by Gemini 3 Flash but not Gemini 3.1 Flash Image Preview. For workloads with large, repeated system prompts or document context — such as RAG pipelines or multi-turn conversations with a fixed knowledge base — prompt caching can reduce effective input costs by 60–90%, which may change the cost ranking between these two models at your specific usage pattern.
Context window capacity differs between the two: Gemini 3 Flash supports up to 1,048,576 tokens in a single request, versus 65,536 tokens for Gemini 3.1 Flash Image Preview. A larger context window is essential for document summarization, large codebase analysis, and multi-document retrieval-augmented generation (RAG) applications.
Use the interactive calculator at the top of this page to enter your actual token usage and monthly request volume for a precise cost comparison tailored to your workload. Adjust for batch API discounts and prompt caching to find the most cost-effective option for your specific deployment.
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Related Provider Pages
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Relevant Use Cases
See cost recommendations for workloads where Gemini 3.1 Flash Image Preview or Gemini 3 Flash is recommended.