| Signal | Grok 4 Fast | Delta | o3 Pro |
|---|---|---|---|
Capabilities | 100 | -- | |
Benchmarks | 70 | -18 | |
Pricing | 1 | -79 | |
Context window size | 100 | +16 | |
Recency | 99 | +18 | |
Output Capacity | 75 | -9 | |
| Overall Result | 2 wins | of 6 | 3 wins |
1
days ranked higher
3
days
26
days ranked higher
xAI
OpenAI
Grok 4 Fast saves you $5955.00/month
That's $71460.00/year compared to o3 Pro at your current usage level of 100K calls/month.
| Metric | Grok 4 Fast | o3 Pro | Winner |
|---|---|---|---|
| Overall Score | 83 | 88 | o3 Pro |
| Rank | #52 | #15 | o3 Pro |
| Quality Rank | #52 | #15 | o3 Pro |
| Adoption Rank | #52 | #15 | o3 Pro |
| Parameters | -- | -- | -- |
| Context Window | 2000K | 200K | Grok 4 Fast |
| Pricing | $0.20/$0.50/M | $20.00/$80.00/M | -- |
| Signal Scores | |||
| Capabilities | 100 | 100 | Grok 4 Fast |
| Benchmarks | 70 | 88 | o3 Pro |
| Pricing | 1 | 80 | o3 Pro |
| Context window size | 100 | 84 | Grok 4 Fast |
| Recency | 99 | 81 | Grok 4 Fast |
| Output Capacity | 75 | 83 | o3 Pro |
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 88/100 (rank #15), placing it in the top 95% of all 290 models tracked.
With only a 4-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 99% better value per quality point. At 1M tokens/day, you'd spend $10.50/month with Grok 4 Fast vs $1500.00/month with o3 Pro - a $1489.50 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 (88/100) 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
o3 Pro has a moderate advantage with a 4.299999999999997-point lead in composite score. It wins on more signal dimensions, but Grok 4 Fast has specific strengths that could make it the better choice for certain workflows.
Best for Quality
Grok 4 Fast
Marginally better benchmark scores; both are excellent
Best for Cost
Grok 4 Fast
99% 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 | o3 Pro |
|---|---|---|
| Vision (Image Input) | ||
| Function Calling | ||
| Streaming | ||
| JSON Mode | ||
| Reasoning | ||
| Web Search | ||
| Image Output |
xAI
OpenAI
Grok 4 Fast saves you $131.04/month
That's 99% cheaper than o3 Pro 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 | o3 Pro |
|---|---|---|
| Context Window | 2M | 200K |
| Max Output Tokens | 30,000 | 100,000 |
| Open Source | No | No |
| Created | Sep 19, 2025 | Jun 10, 2025 |
o3 Pro scores 88/100 (rank #15) compared to Grok 4 Fast's 83/100 (rank #52), giving it a 4-point advantage. o3 Pro is the stronger overall choice, though Grok 4 Fast may excel in specific areas like cost efficiency.
Grok 4 Fast is ranked #52 and o3 Pro is ranked #15 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 o3 Pro's $80.00/M output tokens - 160.0x more expensive. Input token pricing: Grok 4 Fast at $0.20/M vs o3 Pro at $20.00/M.
Grok 4 Fast has a larger context window of 2,000,000 tokens compared to o3 Pro's 200,000 tokens. A larger context window means the model can process longer documents and conversations.