Gemini 2.5 Flash vs Sonar Reasoning Pro (Comparative Analysis)
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Comparative Analysis: Gemini 2.5 Flash vs. Sonar Reasoning Pro
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Overview
Sonar Reasoning Pro was released 3 months before Gemini 2.5 Flash.
 Gemini 2.5 Flash |  Sonar Reasoning Pro | |
|---|---|---|
Model Provider The organization behind this AI's development | Google | Perplexity |
Input Context Window Maximum input tokens this model can process at once | 1M tokens | 128K tokens |
Output Token Limit Maximum output tokens this model can generate at once | 65.5K tokens | Not specified tokens |
Release Date When this model first became publicly available | June 17, 2025 1 year ago June 17th, 2025 | March 7, 2025 1 year ago March 7th, 2025 |
Knowledge Cutoff Latest training-data date reported by the provider | January 31, 2025 | Not reported |
Capabilities & Features
Compare supported features, modalities, and advanced capabilities
Gemini 2.5 Flash | Sonar Reasoning Pro | |
|---|---|---|
Input Types Supported input formats | 📁File🖼️Image📝Text🎵Audio🎬Video | 📝Text🖼️Image |
Reasoning Controls Defaults and configurable reasoning effort | Optional | Optional |
Output Types Supported output formats | 📝Text | 📝Text |
Tokenizer Text encoding system | Gemini | Other |
Key Features Advanced capabilities | ✓Function Calling✓Structured Output✓Reasoning ModeContent Moderation | Function CallingStructured Output✓Reasoning ModeContent Moderation |
Pricing
Gemini 2.5 Flash is roughly 0.1x less expensive compared to Sonar Reasoning Pro for input tokens and roughly 0.3x less expensive for output tokens.
| Gemini 2.5 Flash | Sonar Reasoning Pro | |
|---|---|---|
Input Token Cost Cost per million input tokens | $0.30 per million tokens | $2.00 per million tokens |
Output Token Cost Cost per million output tokens | $2.50 per million tokens | $8.00 per million tokens |
Web Search Cost Additional cost for each web search operation | $0.014 per search | $0.005 per search |
Cache Read Cost Cost to reuse cached input tokens | $0.03 per million tokens | Not specified |
Cache Write Cost Cost to write input tokens to the cache | $0.08 per million tokens | Not specified |
Reasoning Token Cost Cost for internal reasoning tokens | $2.50 per million tokens | Not specified |
Image Input Cost Additional cost for each image input | $0.0000003 per image | Not specified |
Audio Input Cost Additional cost for audio input | $0.000001 per unit | Not specified |
Audio Cache Cost Cost to reuse cached audio input tokens | $0.10 per million tokens | Not specified |
Benchmarks
Compare relevant benchmarks between Gemini 2.5 Flash and Sonar Reasoning Pro.
| Gemini 2.5 Flash | Sonar Reasoning Pro | |
|---|---|---|
Best Design Arena Score Highest human-preference Elo score across design arenas | 1,163 Elo (#65 in Data Viz (48.4% win rate)) | Benchmark not available. |
At a Glance
Quick overview of what makes Gemini 2.5 Flash and Sonar Reasoning Pro unique.
Gemini 2.5 Flash by Google understands both text and images, handles audio, analyzes video, can use external tools and APIs, offers advanced reasoning, generates structured data. It can handle standard conversations with its 1M token context window. Reasonably priced at $0.30/M input and $2.50/M output tokens. Released June 17th, 2025.Sonar Reasoning Pro by Perplexity understands both text and images, offers advanced reasoning. It can handle standard conversations with its 128K token context window. Reasonably priced at $2.00/M input and $8.00/M output tokens. Released March 7th, 2025.Explore More Comparisons
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