API cost decision in 10 seconds

Mercury 2 vs Sonar Pro Search

Pick Mercury 2 for lower cost; pick Sonar Pro Search only if the larger context window matters more.

Page updated:  Data confirmed:  Prices normalized to USD per 1M tokens Sample workload: 1M input + 500K output

Budget verdict

Pick Mercury 2 for lower cost; pick Sonar Pro Search only if the larger context window matters more.

On the standard 1M input plus 500K output workload, Mercury 2 is estimated at $0.62 vs $10.5 for Sonar Pro Search, saving $9.88 (94% lower).

Cost-first pickMercury 2
Context-first pickSonar Pro Search
Sample savings$9.8894%
10x traffic gap$98.75

Sonar Pro Search has more context, but Mercury 2 saves $9.88 on the standard workload. At 10x that traffic, the same price gap is about $98.75. Use the calculator below to replace the sample workload with your own token volume.

Cost sensitivity

Workload Sensitivity

Same prices, different token mixes.

Mercury 2 stays cheaper across input-heavy, balanced, and output-heavy sample workloads.

Workload shapeToken mixBetter pickMercury 2Sonar Pro Search
Input-heavy / RAG5M input + 500K outputMercury 2$1.62$22.5
Balanced workload1M input + 1M outputMercury 2$1$18
Output-heavy chatbot1M input + 5M outputMercury 2$4$78
Cheaper input Mercury 2 $0.25 vs $3 / 1M

Mercury 2 is $2.75 cheaper per 1M input tokens (91.7% lower; 12x difference).

Cheaper output Mercury 2 $0.75 vs $15 / 1M

Mercury 2 is $14.25 cheaper per 1M output tokens (95% lower; 20x difference).

Larger context Sonar Pro Search 128K vs 200K

Sonar Pro Search has 72K more context (1.56x larger).

Sample workload Mercury 2 $0.62 vs $10.5

Mercury 2 is $9.88 cheaper on the standard workload (94% lower).

Estimate your workload cost

Your Workload Cost

Prices are normalized to USD per 1M tokens.
Mercury 2 Calculating… Estimated API cost
Sonar Pro Search Calculating… Estimated API cost
Cheaper for this workload Calculating… Difference: calculating…

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

Verdict

Mercury 2 has the lower input price; Mercury 2 has the lower output price; Sonar Pro Search offers the larger context window. For the 1M input plus 500K output sample, Mercury 2 is cheaper for the standard workload.

For a 1M input token plus 500K output token workload, the estimated API cost is $0.62 for Mercury 2 and $10.5 for Sonar Pro Search.

Best Fit

Choose Mercury 2 when you care most about lower input-token price, and lower output-token price.

Choose Sonar Pro Search when you care most about larger context window.

Decision Notes
  • On the standard 1M input plus 500K output workload, Mercury 2 is estimated at $0.62 vs $10.5 for Sonar Pro Search, saving $9.88 (94% lower).
  • Mercury 2 is $9.88 cheaper on the standard workload (94% lower).
  • Mercury 2 is $2.75 cheaper per 1M input tokens (91.7% lower; 12x difference).
  • Mercury 2 is $14.25 cheaper per 1M output tokens (95% lower; 20x difference).
  • Sonar Pro Search has 72K more context (1.56x larger).
Head-to-Head Specs
FeatureMercury 2
(Inception)		Sonar Pro Search
(Perplexity)
Input Price
prompt tokens per 1M		$0.25$3
Completion Price
per 1M tokens		$0.75$15
Sample Workload Cost
1M input + 500K output		$0.62$10.5
Context Window128K200K
Release Date

Use-Case Decision Matrix

Use caseBetter pickWhy
Budget-constrained productionMercury 2On the standard 1M input plus 500K output workload, Mercury 2 is estimated at $0.62 vs $10.5 for Sonar Pro Search, saving $9.88 (94% lower).
High-volume input processingMercury 2Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill.
Long responses and chatbotsMercury 2Lower output-token price matters most when assistants generate many completion tokens.
RAG or long-document workSonar Pro SearchA larger context window leaves more room for retrieved passages, conversation history, or source files.

Related Alternatives

Same-provider lower-cost swaps
  • 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.
Larger context near this budget
  • 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.

Cheaper alternatives

Review low-cost models sorted by a standard 1M input plus 500K output workload.

Open cheapest models

Larger context alternatives

Find models with larger context windows for RAG, long documents, and codebase review.

Open largest context models

Provider catalogs

Compare models within provider hubs before choosing a final API vendor.

Open provider hubs

Inception catalog

Review all tracked Inception models before deciding whether this matchup is the right shortlist.

Open Inception models

Perplexity catalog

Check other Perplexity models with comparable pricing, context, or release timing.

Open Perplexity models
Mercury 2

Mercury 2 is an extremely fast reasoning LLM, and the first reasoning diffusion LLM (dLLM). Instead of generating tokens sequentially, Mercury 2 produces and refines multiple tokens in parallel, achieving...

Sonar Pro Search

Exclusively available on the OpenRouter API, Sonar Pro's new Pro Search mode is Perplexity's most advanced agentic search system. It is designed for deeper reasoning and analysis. Pricing is based...