Claude Sonnet 4.5 vs Sonar Pro: API Cost Comparison
Compare the API pricing, context windows, features, and real-world cost projections for Claude Sonnet 4.5 (Anthropic) and Sonar Pro (Perplexity). Use the interactive calculator below to compute your exact monthly cost based on your token usage and request volume.
Prices verified Mar 24, 2026
Interactive Cost Calculator
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Showing costs for 2 models. Cheapest: Claude Sonnet 4.5 at $105.00/month.
| Alert | |||||||
|---|---|---|---|---|---|---|---|
BestClaude Sonnet 4.5 | Anthropic | $105.00 | $0.010500 | $30.00 | $75.00 | — | Alerts coming soon |
Sonar Pro | Perplexity | $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 | Sonar Pro | Cheaper |
|---|---|---|---|
| Input (standard) | $3.00/M | $3.00/M | — |
| Output | $15.00/M | $15.00/M | — |
| Cached input | $0.30/M | N/A | — |
| Batch input | $1.50/M | N/A | — |
| Batch output | $7.50/M | N/A | — |
Prices last verified: 2026-03-10 – 2026-03-24
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 4.5Monthly | Sonar ProMonthly | Claude Sonnet 4.5Per request | Sonar ProPer request |
|---|---|---|---|---|
| 1K requests/mo | $10.50 | $10.50 | $0.010500 | $0.010500 |
| 10K requests/mo | $105.00 | $105.00 | $0.010500 | $0.010500 |
| 100K requests/mo | $1,050.00 | $1,050.00 | $0.010500 | $0.010500 |
| 1M requests/mo | $10,500.00 | $10,500.00 | $0.010500 | $0.010500 |
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
by Anthropic
- Code generation
- Content & copywriting
- RAG / Semantic search
Input / 1M tokens
$3.00/M
Output / 1M tokens
$15.00/M
Context window
200,000
Tier
mid
When to Choose Sonar Pro
by Perplexity
- RAG / Semantic search
- Document summarization
- General chatbot
Input / 1M tokens
$3.00/M
Output / 1M tokens
$15.00/M
Context window
200,000
Tier
premium
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 | Sonar Pro |
|---|---|---|
| Context window | 200,000 tokens | 200,000 tokens |
| Max output tokens | 64,000 tokens | 8,192 tokens |
| Performance tier | Mid | Premium |
| Vision / image input | Yes | No |
| Function calling | Yes | No |
| JSON mode | Yes | No |
| Prompt caching | Yes | No |
| Batch API (50% discount) | Yes | No |
| Extended reasoning | Yes | No |
| Fine-tuning | No | No |
| Rate limit (req/min) | 4,000 | Not published |
Claude Sonnet 4.5 notes
Extended thinking mode available. Strong coding benchmark scores.
Sonar Pro notes
Search pricing: $6-$14 per 1,000 requests. Pro Search surcharge: $14-$22 per 1,000 requests. Best for complex multi-step research queries.
Frequently Asked Questions
Is Claude Sonnet 4.5 cheaper than Sonar Pro?
Claude Sonnet 4.5 and Sonar Pro cost the same at standard usage (1,000 input + 500 output tokens, 100K requests/month): $1,050.00/month each. For different token ratios, use the calculator above.
Which model has a larger context window, Claude Sonnet 4.5 or Sonar Pro?
Both Claude Sonnet 4.5 and Sonar Pro have the same context window: 200,000 tokens.
Do Claude Sonnet 4.5 and Sonar Pro support the Batch API?
Claude Sonnet 4.5 supports the Batch API (50% discount for async processing), while Sonar Pro does not. If your workload tolerates up to 24-hour latency, routing to Claude Sonnet 4.5 with batch pricing could significantly cut costs versus Sonar Pro's standard rate.
Which model offers better prompt caching?
Claude Sonnet 4.5 supports prompt caching at $0.30/M for cached input, while Sonar Pro does not offer prompt caching. For RAG applications or chatbots with large, repeated context, Claude Sonnet 4.5's caching capability can substantially reduce effective costs.
What are the best use cases for Claude Sonnet 4.5 vs Sonar Pro?
Both models are well-suited for RAG / Semantic search. Claude Sonnet 4.5 is particularly strong for Code generation, Content & copywriting. Sonar Pro is favored for Document summarization, General chatbot. 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 vs Sonar Pro?
At 1,000 input tokens and 500 output tokens per request — a typical conversational workload — Claude Sonnet 4.5 costs $0.010500 per request and Sonar Pro costs $0.010500 per request. At 100,000 requests/month, that translates to $1,050.00 and $1,050.00 respectively. Use the interactive calculator to adjust these parameters for your actual workload.
Claude Sonnet 4.5 vs Sonar Pro: Summary
When comparing Claude Sonnet 4.5 and Sonar Pro 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 $1,050.00/month.
Both models are priced in USD per million tokens, the standard unit across all major AI API providers. Claude Sonnet 4.5 charges $3.00/M for input tokens and $15.00/M for output tokens. Sonar Pro charges $3.00/M input and $15.00/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 Claude Sonnet 4.5 but not Sonar Pro. 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: Both models support 200,000 tokens per request. 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 or Sonar Pro is recommended.