Free Models Router is free for input tokens while Sonar Pro Search costs $3 per 1M tokens.
API cost decision in 10 seconds
Free Models Router vs Sonar Pro Search
Pick Free Models Router when budget is the priority.
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Data confirmed:
Prices normalized to USD per 1M tokens
Sample workload: 1M input + 500K output
Budget verdict
Pick Free Models Router when budget is the priority.
On the standard 1M input plus 500K output workload, Free Models Router is estimated at $0 vs $10.5 for Sonar Pro Search, saving $10.5 (100% lower).
Cost-first pickFree Models Router
Context-first pickBoth models
Sample savings$10.5100%
10x traffic gap$105
The reported context window is tied, so cost and provider fit carry more weight. At 10x that traffic, the same price gap is about $105. Use the calculator below to replace the sample workload with your own token volume.
Cost sensitivity
Workload Sensitivity
Free Models Router stays cheaper across input-heavy, balanced, and output-heavy sample workloads.
| Workload shape | Token mix | Better pick | Free Models Router | Sonar Pro Search |
|---|---|---|---|---|
| Input-heavy / RAG | 5M input + 500K output | Free Models Router | $0 | $22.5 |
| Balanced workload | 1M input + 1M output | Free Models Router | $0 | $18 |
| Output-heavy chatbot | 1M input + 5M output | Free Models Router | $0 | $78 |
Free Models Router is free for output tokens while Sonar Pro Search costs $15 per 1M tokens.
Both models report the same context window at 200K tokens.
Free Models Router is free for the standard workload while the other model is estimated at $10.5.
Estimate your workload cost
Your Workload Cost
This estimate uses normalized public API pricing per 1M tokens. It is a planning aid, not a billing quote. Verify provider pricing, limits, and terms before production use.
Quick Decision
Free Models Router has the lower input price; Free Models Router has the lower output price; both models report the same context window. For the 1M input plus 500K output sample, Free Models Router is cheaper for the standard workload.
For a 1M input token plus 500K output token workload, the estimated API cost is $0 for Free Models Router and $10.5 for Sonar Pro Search.
Choose Free Models Router when you care most about lower input-token price, and lower output-token price.
Choose Sonar Pro Search when its provider, model quality, latency, or availability is more important than the numeric price/context winner.
- On the standard 1M input plus 500K output workload, Free Models Router is estimated at $0 vs $10.5 for Sonar Pro Search, saving $10.5 (100% lower).
- Free Models Router is free for the standard workload while the other model is estimated at $10.5.
- Free Models Router is free for input tokens while Sonar Pro Search costs $3 per 1M tokens.
- Free Models Router is free for output tokens while Sonar Pro Search costs $15 per 1M tokens.
- Both models report the same context window at 200K tokens.
| Feature | Free Models Router (OpenRouter) | Sonar Pro Search (Perplexity) |
|---|---|---|
| Input Price prompt tokens per 1M | $0 | $3 |
| Completion Price per 1M tokens | $0 | $15 |
| Sample Workload Cost 1M input + 500K output | $0 | $10.5 |
| Context Window | 200K | 200K |
| Release Date |
Use-Case Decision Matrix
| Use case | Better pick | Why |
|---|---|---|
| Budget-constrained production | Free Models Router | On the standard 1M input plus 500K output workload, Free Models Router is estimated at $0 vs $10.5 for Sonar Pro Search, saving $10.5 (100% lower). |
| High-volume input processing | Free Models Router | Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill. |
| Long responses and chatbots | Free Models Router | Lower output-token price matters most when assistants generate many completion tokens. |
| RAG or long-document work | Tie | A larger context window leaves more room for retrieved passages, conversation history, or source files. |
Related Alternatives
- Sonar can replace Sonar Pro Search when lower sample workload cost matters most: $1.5.
- Sonar Reasoning Pro can replace Sonar Pro Search when lower sample workload cost matters most: $6.
- Sonar Deep Research can replace Sonar Pro Search when lower sample workload cost matters most: $6.
- Llama 4 Scout offers 10M context with $0.23 sample workload cost.
- Grok 4.20 Multi-Agent offers 2M context with $5 sample workload cost.
- Grok 4.20 offers 2M context with $2.5 sample workload cost.
- GPT-5.4 offers 1.05M context with $10 sample workload cost.
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