Qwen3.5 Plus (OpenRouter) vs Sonar Reasoning Pro: API Cost Comparison
Compare the API pricing, context windows, features, and real-world cost projections for Qwen3.5 Plus (OpenRouter) (OpenRouter) and Sonar Reasoning Pro (Perplexity). Use the interactive calculator below to compute your exact monthly cost based on your token usage and request volume.
Prices verified Mar 10, 2026
Interactive Cost Calculator
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Showing costs for 2 models. Cheapest: Qwen3.5 Plus (OpenRouter) at $10.40/month.
| Alert | |||||||
|---|---|---|---|---|---|---|---|
BestQwen3.5 Plus (OpenRouter) | OpenRouter | $10.40 | $0.001040 | $2.60 | $7.80 | 82.7% | Alerts coming soon |
Sonar Reasoning Pro | Perplexity | $60.00 | $0.006000 | $20.00 | $40.00 | — | Alerts coming soon |
Monthly Cost Comparison
Price Comparison at a Glance
All prices are in USD per 1 million tokens ($/M tokens). Lower is cheaper.
| Pricing Type | Qwen3.5 Plus (OpenRouter) | Sonar Reasoning Pro | Cheaper |
|---|---|---|---|
| Input (standard) | $0.26/M | $2.00/M | Qwen3.5 Plus (OpenRouter) |
| Output | $1.56/M | $8.00/M | Qwen3.5 Plus (OpenRouter) |
Prices last verified: 2026-03-10
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 | Qwen3.5 Plus (OpenRouter)Monthly | Sonar Reasoning ProMonthly | Qwen3.5 Plus (OpenRouter)Per request | Sonar Reasoning ProPer request |
|---|---|---|---|---|
| 1K requests/mo | $1.04 | $6.00 | $0.001040 | $0.006000 |
| 10K requests/mo | $10.40 | $60.00 | $0.001040 | $0.006000 |
| 100K requests/mo | $104.00 | $600.00 | $0.001040 | $0.006000 |
| 1M requests/mo | $1,040.00 | $6,000.00 | $0.001040 | $0.006000 |
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 Qwen3.5 Plus (OpenRouter)
by OpenRouter
- Code generation
- Document summarization
- General chatbot
Input / 1M tokens
$0.26/M
Output / 1M tokens
$1.56/M
Context window
1,000,000
Tier
mid
When to Choose Sonar Reasoning Pro
by Perplexity
- RAG / Semantic search
- Document summarization
Input / 1M tokens
$2.00/M
Output / 1M tokens
$8.00/M
Context window
127,072
Tier
reasoning
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 | Qwen3.5 Plus (OpenRouter) | Sonar Reasoning Pro |
|---|---|---|
| Context window | 1,000,000 tokens | 127,072 tokens |
| Max output tokens | 65,536 tokens | 8,192 tokens |
| Performance tier | Mid | Reasoning |
| Vision / image input | No | No |
| Function calling | Yes | No |
| JSON mode | Yes | No |
| Prompt caching | No | No |
| Batch API (50% discount) | No | No |
| Extended reasoning | No | Yes |
| Fine-tuning | No | No |
Qwen3.5 Plus (OpenRouter) notes
OpenRouter offers 200+ models — showing top 15 unique models not available from other listed providers. Prices include OpenRouter markup.
Sonar Reasoning Pro notes
Search pricing: $6-$14 per 1,000 requests. Chain of Thought reasoning with web grounding. Best for complex factual queries requiring step-by-step analysis.
Frequently Asked Questions
Is Qwen3.5 Plus (OpenRouter) cheaper than Sonar Reasoning Pro?
At standard usage (1,000 input tokens, 500 output tokens, 100,000 requests/month), Qwen3.5 Plus (OpenRouter) costs $104.00/month versus $600.00/month for Sonar Reasoning Pro — a 83% 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, Qwen3.5 Plus (OpenRouter) or Sonar Reasoning Pro?
Qwen3.5 Plus (OpenRouter) has a larger context window at 1,000,000 tokens, compared to 127,072 tokens for Sonar Reasoning Pro. A larger context window is important for processing long documents, multi-turn conversations, or large codebases without truncation.
Do Qwen3.5 Plus (OpenRouter) and Sonar Reasoning Pro support the Batch API?
Neither Qwen3.5 Plus (OpenRouter) nor Sonar Reasoning Pro currently supports a batch API with discounted pricing. For batch-eligible alternatives, consider models from OpenAI, Anthropic, or Google that include batch API support.
Which model offers better prompt caching?
Neither Qwen3.5 Plus (OpenRouter) nor Sonar Reasoning Pro 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 Qwen3.5 Plus (OpenRouter) vs Sonar Reasoning Pro?
Both models are well-suited for Document summarization. Qwen3.5 Plus (OpenRouter) is particularly strong for Code generation, General chatbot. Sonar Reasoning Pro is favored for RAG / Semantic search. 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 Qwen3.5 Plus (OpenRouter) vs Sonar Reasoning Pro?
At 1,000 input tokens and 500 output tokens per request — a typical conversational workload — Qwen3.5 Plus (OpenRouter) costs $0.001040 per request and Sonar Reasoning Pro costs $0.006000 per request. At 100,000 requests/month, that translates to $104.00 and $600.00 respectively. Use the interactive calculator to adjust these parameters for your actual workload.
Qwen3.5 Plus (OpenRouter) vs Sonar Reasoning Pro: Summary
When comparing Qwen3.5 Plus (OpenRouter) and Sonar Reasoning Pro for API cost, the right choice depends on your workload's token profile, required features, and tolerance for latency. Qwen3.5 Plus (OpenRouter) offers lower total cost at standard usage volumes (1,000 input + 500 output tokens per request at 100,000 requests/month) at $104.00/month, compared to $600.00/month for Sonar Reasoning Pro.
Both models are priced in USD per million tokens, the standard unit across all major AI API providers. Qwen3.5 Plus (OpenRouter) charges $0.26/M for input tokens and $1.56/M for output tokens. Sonar Reasoning Pro charges $2.00/M input and $8.00/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: Qwen3.5 Plus (OpenRouter) supports up to 1,000,000 tokens in a single request, versus 127,072 tokens for Sonar Reasoning Pro. 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 Qwen3.5 Plus (OpenRouter) or Sonar Reasoning Pro is recommended.