| Signal | GPT-5 Nano | Delta | Grok 4 Fast |
|---|---|---|---|
Capabilities | 100 | -- | |
Pricing | 0 | 0 | |
Context window size | 89 | -11 | |
Recency | 93 | -7 | |
Output Capacity | 85 | +11 | |
| Overall Result | 1 wins | of 5 | 3 wins |
5
days ranked higher
0
days
25
days ranked higher
OpenAI
xAI
GPT-5 Nano saves you $20.00/month
That's $240.00/year compared to Grok 4 Fast at your current usage level of 100K calls/month.
| Metric | GPT-5 Nano | Grok 4 Fast | Winner |
|---|---|---|---|
| Overall Score | 94 | 96 | Grok 4 Fast |
| Rank | #19 | #6 | Grok 4 Fast |
| Quality Rank | #19 | #6 | Grok 4 Fast |
| Adoption Rank | #19 | #6 | Grok 4 Fast |
| Parameters | -- | -- | -- |
| Context Window | 400K | 2000K | Grok 4 Fast |
| Pricing | $0.05/$0.40/M | $0.20/$0.50/M | -- |
| Signal Scores | |||
| Capabilities | 100 | 100 | GPT-5 Nano |
| Pricing | 0 | 1 | Grok 4 Fast |
| Context window size | 89 | 100 | Grok 4 Fast |
| Recency | 93 | 100 | Grok 4 Fast |
| Output Capacity | 85 | 75 | GPT-5 Nano |
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 94/100 (rank #19), placing it in the top 94% of all 290 models tracked.
Scores 96/100 (rank #6), placing it in the top 98% 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.
GPT-5 Nano offers 36% better value per quality point. At 1M tokens/day, you'd spend $6.75/month with GPT-5 Nano vs $10.50/month with Grok 4 Fast — a $3.75 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. GPT-5 Nano 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 ($0.40/M) reduces costs when processing thousands of records daily
Creative writing & content
Higher overall composite score (96/100) 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
GPT-5 Nano and Grok 4 Fast are extremely close in overall performance (only 2.1000000000000085 points apart). Your best choice depends entirely on which specific strengths matter most for your use case.
Best for Quality
GPT-5 Nano
Marginally better benchmark scores; both are excellent
Best for Cost
GPT-5 Nano
36% lower pricing; better value at scale
Best for Reliability
GPT-5 Nano
Higher uptime and faster response speeds
Best for Prototyping
GPT-5 Nano
Stronger community support and better developer experience
Best for Production
GPT-5 Nano
Wider enterprise adoption and proven at scale
by OpenAI
| Capability | GPT-5 Nano | Grok 4 Fast |
|---|---|---|
| Vision (Image Input) | ||
| Function Calling | ||
| Streaming | ||
| JSON Mode | ||
| Reasoning | ||
| Web Search | ||
| Image Output |
OpenAI
xAI
GPT-5 Nano saves you $0.3900/month
That's 41% cheaper than Grok 4 Fast 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 | GPT-5 Nano | Grok 4 Fast |
|---|---|---|
| Context Window | 400K | 2M |
| Max Output Tokens | 128,000 | 30,000 |
| Open Source | No | No |
| Created | Aug 7, 2025 | Sep 19, 2025 |
Grok 4 Fast scores 96/100 (rank #6) compared to GPT-5 Nano's 94/100 (rank #19), giving it a 2-point advantage. Grok 4 Fast is the stronger overall choice, though GPT-5 Nano may excel in specific areas like cost efficiency.
GPT-5 Nano is ranked #19 and Grok 4 Fast is ranked #6 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.
GPT-5 Nano is cheaper at $0.40/M output tokens vs Grok 4 Fast's $0.50/M output tokens — 1.3x more expensive. Input token pricing: GPT-5 Nano at $0.05/M vs Grok 4 Fast at $0.20/M.
Grok 4 Fast has a larger context window of 2,000,000 tokens compared to GPT-5 Nano's 400,000 tokens. A larger context window means the model can process longer documents and conversations.