| Signal | Grok 4 Fast | Delta | Sonar Pro Search |
|---|---|---|---|
Capabilities | 100 | +17 | |
Benchmarks | 70 | +70 | |
Pricing | 1 | -14 | |
Context window size | 100 | +16 | |
Recency | 99 | -1 | |
Output Capacity | 75 | +10 | |
| Overall Result | 4 wins | of 6 | 2 wins |
6
days ranked higher
2
days
22
days ranked higher
xAI
Perplexity
Grok 4 Fast saves you $1005.00/month
That's $12060.00/year compared to Sonar Pro Search at your current usage level of 100K calls/month.
| Metric | Grok 4 Fast | Sonar Pro Search | Winner |
|---|---|---|---|
| Overall Score | 83 | 85 | Sonar Pro Search |
| Rank | #52 | #39 | Sonar Pro Search |
| Quality Rank | #52 | #39 | Sonar Pro Search |
| Adoption Rank | #52 | #39 | Sonar Pro Search |
| Parameters | -- | -- | -- |
| Context Window | 2000K | 200K | Grok 4 Fast |
| Pricing | $0.20/$0.50/M | $3.00/$15.00/M | -- |
| Signal Scores | |||
| Capabilities | 100 | 83 | Grok 4 Fast |
| Benchmarks | 70 | -- | Grok 4 Fast |
| Pricing | 1 | 15 | Sonar Pro Search |
| Context window size | 100 | 84 | Grok 4 Fast |
| Recency | 99 | 100 | Sonar Pro Search |
| Output Capacity | 75 | 65 | Grok 4 Fast |
Our composite score (0–100) combines six weighted signals: benchmark performance (25%), pricing efficiency (25%), context window size (15%), model recency (15%), output capacity (10%), and capability versatility (10%). Here's what the scores mean for these two models:
Scores 83/100 (rank #52), placing it in the top 82% of all 290 models tracked.
Scores 85/100 (rank #39), placing it in the top 87% of all 290 models tracked.
With only a 2-point gap, these models are in the same performance tier. The practical difference in output quality is minimal - your choice should depend on pricing, latency requirements, and specific feature needs.
Grok 4 Fast offers 96% better value per quality point. At 1M tokens/day, you'd spend $10.50/month with Grok 4 Fast vs $270.00/month with Sonar Pro Search - a $259.50 monthly difference.
Both models have comparable response speeds. For most applications, the latency difference is negligible.
When latency matters most: Interactive chatbots, IDE code completion, real-time translation, and user-facing applications where response time directly impacts experience. For batch processing, background summarization, or offline analysis, latency is less critical.
Code generation & review
Higher benchmark score (0/100) indicates stronger performance on coding tasks like generating functions, debugging, and refactoring
Customer support chatbot
Faster response time (speed score 0/100) is critical for user-facing chat. Grok 4 Fast also offers lower per-token costs for high-volume support
Long document analysis
Larger context window (2000K tokens) can process longer documents, contracts, and research papers in a single pass
Batch data extraction
Lower output pricing ($0.50/M) reduces costs when processing thousands of records daily
Creative writing & content
Higher overall composite score (85/100) correlates with better nuance, coherence, and style in long-form content
Image understanding & OCR
Supports vision input - can analyze screenshots, diagrams, photos, and scanned documents directly
Grok 4 Fast and Sonar Pro Search are extremely close in overall performance (only 1.5999999999999943 points apart). Your best choice depends entirely on which specific strengths matter most for your use case.
Best for Quality
Grok 4 Fast
Marginally better benchmark scores; both are excellent
Best for Cost
Grok 4 Fast
96% lower pricing; better value at scale
Best for Reliability
Grok 4 Fast
Higher uptime and faster response speeds
Best for Prototyping
Grok 4 Fast
Stronger community support and better developer experience
Best for Production
Grok 4 Fast
Wider enterprise adoption and proven at scale
by xAI
| Capability | Grok 4 Fast | Sonar Pro Search |
|---|---|---|
| Vision (Image Input) | ||
| Function Callingdiffers | ||
| Streaming | ||
| JSON Mode | ||
| Reasoning | ||
| Web Search | ||
| Image Output |
xAI
Perplexity
Grok 4 Fast saves you $22.44/month
That's 96% cheaper than Sonar Pro Search at 1,000 tokens/request and 100 requests/day.
Assumes 60% input / 40% output token ratio per request. Actual costs may vary based on your usage pattern.
| Parameter | Grok 4 Fast | Sonar Pro Search |
|---|---|---|
| Context Window | 2M | 200K |
| Max Output Tokens | 30,000 | 8,000 |
| Open Source | No | No |
| Created | Sep 19, 2025 | Oct 30, 2025 |
Sonar Pro Search scores 85/100 (rank #39) compared to Grok 4 Fast's 83/100 (rank #52), giving it a 2-point advantage. Sonar Pro Search is the stronger overall choice, though Grok 4 Fast may excel in specific areas like cost efficiency.
Grok 4 Fast is ranked #52 and Sonar Pro Search is ranked #39 out of 290+ AI models. Rankings use a composite score combining benchmark performance (25%), pricing (25%), context window (15%), recency (15%), output capacity (10%), and versatility (10%). Scores update hourly.
Grok 4 Fast is cheaper at $0.50/M output tokens vs Sonar Pro Search's $15.00/M output tokens - 30.0x more expensive. Input token pricing: Grok 4 Fast at $0.20/M vs Sonar Pro Search at $3.00/M.
Grok 4 Fast has a larger context window of 2,000,000 tokens compared to Sonar Pro Search's 200,000 tokens. A larger context window means the model can process longer documents and conversations.