Claude Sonnet 4.5 (Bedrock) vs Gemini 3.1 Pro Preview Custom Tools: API Cost Comparison
Compare the API pricing, context windows, features, and real-world cost projections for Claude Sonnet 4.5 (Bedrock) (AWS Bedrock) and Gemini 3.1 Pro Preview Custom Tools (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 Pro Preview Custom Tools at $80.00/month.
| Alert | |||||||
|---|---|---|---|---|---|---|---|
BestGemini 3.1 Pro Preview Custom Tools | $80.00 | $0.008000 | $20.00 | $60.00 | 23.8% | Alerts coming soon | |
Claude Sonnet 4.5 (Bedrock) | AWS Bedrock | $105.00 | $0.010500 | $30.00 | $75.00 | — | Alerts coming soon |
Monthly Cost Comparison
Price Comparison at a Glance
All prices are in USD per 1 million tokens ($/M tokens). Lower is cheaper.
| Pricing Type | Claude Sonnet 4.5 (Bedrock) | Gemini 3.1 Pro Preview Custom Tools | Cheaper |
|---|---|---|---|
| Input (standard) | $3.00/M | $2.00/M | Gemini 3.1 Pro Preview Custom Tools |
| Output | $15.00/M | $12.00/M | Gemini 3.1 Pro Preview Custom Tools |
Prices last verified: 2026-03-11 – 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 | Claude Sonnet 4.5 (Bedrock)Monthly | Gemini 3.1 Pro Preview Custom ToolsMonthly | Claude Sonnet 4.5 (Bedrock)Per request | Gemini 3.1 Pro Preview Custom ToolsPer request |
|---|---|---|---|---|
| 1K requests/mo | $10.50 | $8.00 | $0.010500 | $0.008000 |
| 10K requests/mo | $105.00 | $80.00 | $0.010500 | $0.008000 |
| 100K requests/mo | $1,050.00 | $800.00 | $0.010500 | $0.008000 |
| 1M requests/mo | $10,500.00 | $8,000.00 | $0.010500 | $0.008000 |
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 Claude Sonnet 4.5 (Bedrock)
by AWS Bedrock
- Code generation
- Content Creation
- General chatbot
Input / 1M tokens
$3.00/M
Output / 1M tokens
$15.00/M
Context window
200,000
Tier
premium
When to Choose Gemini 3.1 Pro Preview Custom Tools
by Google
- General chatbot
Input / 1M tokens
$2.00/M
Output / 1M tokens
$12.00/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 | Claude Sonnet 4.5 (Bedrock) | Gemini 3.1 Pro Preview Custom Tools |
|---|---|---|
| Context window | 200,000 tokens | 1,048,576 tokens |
| Max output tokens | 8,192 tokens | 65,536 tokens |
| Performance tier | Premium | Mid |
| Vision / image input | Yes | Yes |
| Function calling | Yes | Yes |
| JSON mode | Yes | Yes |
| Prompt caching | No | No |
| Batch API (50% discount) | Yes | No |
| Extended reasoning | No | No |
| Fine-tuning | No | No |
Claude Sonnet 4.5 (Bedrock) notes
Claude Sonnet 4.5 accessed via AWS Bedrock. Pricing matches Anthropic direct. AWS IAM auth, VPC support, and CloudWatch logging available.
Frequently Asked Questions
Is Claude Sonnet 4.5 (Bedrock) cheaper than Gemini 3.1 Pro Preview Custom Tools?
At standard usage (1,000 input tokens, 500 output tokens, 100,000 requests/month), Gemini 3.1 Pro Preview Custom Tools costs $800.00/month versus $1,050.00/month for Claude Sonnet 4.5 (Bedrock) — a 24% saving. Your actual savings will vary based on your token profile; output-heavy workloads amplify differences in output pricing.
Which model has a larger context window, Claude Sonnet 4.5 (Bedrock) or Gemini 3.1 Pro Preview Custom Tools?
Gemini 3.1 Pro Preview Custom Tools has a larger context window at 1,048,576 tokens, compared to 200,000 tokens for Claude Sonnet 4.5 (Bedrock). A larger context window is important for processing long documents, multi-turn conversations, or large codebases without truncation.
Do Claude Sonnet 4.5 (Bedrock) and Gemini 3.1 Pro Preview Custom Tools support the Batch API?
Claude Sonnet 4.5 (Bedrock) supports the Batch API (50% discount for async processing), while Gemini 3.1 Pro Preview Custom Tools does not. If your workload tolerates up to 24-hour latency, routing to Claude Sonnet 4.5 (Bedrock) with batch pricing could significantly cut costs versus Gemini 3.1 Pro Preview Custom Tools's standard rate.
Which model offers better prompt caching?
Neither Claude Sonnet 4.5 (Bedrock) nor Gemini 3.1 Pro Preview Custom Tools currently supports prompt caching. For prompt-caching capable alternatives, consider Claude models from Anthropic or GPT-4o from OpenAI.
What are the best use cases for Claude Sonnet 4.5 (Bedrock) vs Gemini 3.1 Pro Preview Custom Tools?
Both models are well-suited for General chatbot. Claude Sonnet 4.5 (Bedrock) is particularly strong for Code generation, Content Creation. Gemini 3.1 Pro Preview Custom Tools is favored for similar workflows. 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 Claude Sonnet 4.5 (Bedrock) vs Gemini 3.1 Pro Preview Custom Tools?
At 1,000 input tokens and 500 output tokens per request — a typical conversational workload — Claude Sonnet 4.5 (Bedrock) costs $0.010500 per request and Gemini 3.1 Pro Preview Custom Tools costs $0.008000 per request. At 100,000 requests/month, that translates to $1,050.00 and $800.00 respectively. Use the interactive calculator to adjust these parameters for your actual workload.
Claude Sonnet 4.5 (Bedrock) vs Gemini 3.1 Pro Preview Custom Tools: Summary
When comparing Claude Sonnet 4.5 (Bedrock) and Gemini 3.1 Pro Preview Custom Tools for API cost, the right choice depends on your workload's token profile, required features, and tolerance for latency. Gemini 3.1 Pro Preview Custom Tools offers lower total cost at standard usage volumes (1,000 input + 500 output tokens per request at 100,000 requests/month) at $800.00/month, compared to $1,050.00/month for Claude Sonnet 4.5 (Bedrock).
Both models are priced in USD per million tokens, the standard unit across all major AI API providers. Claude Sonnet 4.5 (Bedrock) charges $3.00/M for input tokens and $15.00/M for output tokens. Gemini 3.1 Pro Preview Custom Tools charges $2.00/M input and $12.00/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.
Context window capacity differs between the two: Gemini 3.1 Pro Preview Custom Tools supports up to 1,048,576 tokens in a single request, versus 200,000 tokens for Claude Sonnet 4.5 (Bedrock). 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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Relevant Use Cases
See cost recommendations for workloads where Claude Sonnet 4.5 (Bedrock) or Gemini 3.1 Pro Preview Custom Tools is recommended.