| Signal | GPT-5.4 Nano | Delta | Grok 4 Fast |
|---|---|---|---|
Capabilities | 100 | -- | |
Benchmarks | 90 | +21 | |
Pricing | 99 | -1 | |
Context window size | 89 | -11 | |
Recency | 100 | +10 | |
Output Capacity | 85 | +11 | |
| Overall Result | 3 wins | of 6 | 2 wins |
Score History
79.3
current score
GPT-5.4 Nano
right now
72.5
current score
OpenAI
xAI
Grok 4 Fast saves you $37.50/month
That's $450.00/year compared to GPT-5.4 Nano at your current usage level of 100K calls/month.
| Metric | GPT-5.4 Nano | Grok 4 Fast | Winner |
|---|---|---|---|
| Overall Score | 79 | 73 | GPT-5.4 Nano |
| Rank | #42 | #80 | GPT-5.4 Nano |
| Quality Rank | #42 | #80 | GPT-5.4 Nano |
| Adoption Rank | #42 | #80 | GPT-5.4 Nano |
| Parameters | -- | -- | -- |
| Context Window | 400K | 2000K | Grok 4 Fast |
| Pricing | $0.20/$1.25/M | $0.20/$0.50/M | -- |
| Signal Scores | |||
| Capabilities | 100 | 100 | GPT-5.4 Nano |
| Benchmarks | 90 | 70 | GPT-5.4 Nano |
| Pricing | 99 | 100 | Grok 4 Fast |
| Context window size | 89 | 100 | Grok 4 Fast |
| Recency | 100 | 90 | GPT-5.4 Nano |
| Output Capacity | 85 | 75 | GPT-5.4 Nano |
Our score (0-100) is driven by benchmark performance (90%) from Arena Elo ratings, MMLU, GPQA, HumanEval, SWE-bench, and 15+ standardized evaluations. Capabilities and context window serve as tiebreakers (10%). Learn more about our methodology.
Scores 79/100 (rank #42), placing it in the top 86% of all 290 models tracked.
Scores 73/100 (rank #80), placing it in the top 73% of all 290 models tracked.
GPT-5.4 Nano has a 7-point advantage, which typically translates to noticeably better performance on complex reasoning, code generation, and multi-step tasks.
Grok 4 Fast offers 52% better value per quality point. At 1M tokens/day, you'd spend $10.50/month with Grok 4 Fast vs $21.75/month with GPT-5.4 Nano - a $11.25 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
Based on overall model capabilities and architecture for coding tasks like generating functions, debugging, and refactoring
Customer support chatbot
Suitable for user-facing chat with competitive response times. 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 (79/100) 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-5.4 Nano has a moderate advantage with a 6.799999999999997-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
GPT-5.4 Nano
Marginally better benchmark scores; both are excellent
Best for Cost
Grok 4 Fast
52% lower pricing; better value at scale
Best for Reliability
GPT-5.4 Nano
Higher uptime and faster response speeds
Best for Prototyping
GPT-5.4 Nano
Stronger community support and better developer experience
Best for Production
GPT-5.4 Nano
Wider enterprise adoption and proven at scale
by OpenAI
| Capability | GPT-5.4 Nano | Grok 4 Fast |
|---|---|---|
| Vision (Image Input) | ||
| Function Calling | ||
| Streaming | ||
| JSON Mode | ||
| Reasoning | ||
| Web Search | ||
| Image Output |
OpenAI
xAI
Grok 4 Fast saves you $0.9000/month
That's 48% cheaper than GPT-5.4 Nano 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-5.4 Nano | Grok 4 Fast |
|---|---|---|
| Context Window | 400K | 2M |
| Max Output Tokens | 128,000 | 30,000 |
| Open Source | No | No |
| Created | Mar 17, 2026 | Sep 19, 2025 |
The 14-point score gap reflects Grok 4 Fast's superior coding performance benchmarks, while its 2.5x lower output pricing ($0.50/M vs $1.25/M) makes it more cost-effective for generation-heavy workloads. The combination of top-tier performance and competitive output pricing explains why Grok 4 Fast achieves the #2 ranking despite being from a newer provider.
With 8M input tokens costing $1.60 on both models but 2M output tokens costing $1.00 on Grok 4 Fast versus $2.50 on GPT-5.4 Nano, you'd save $1.50 daily or $547.50 annually. This 60% cost reduction on output tokens becomes especially critical for applications like code completion or documentation generation where output volume is high.
Grok 4 Fast can analyze entire large codebases or multiple files simultaneously within its 2.0M token window, making it superior for cross-file refactoring and architectural analysis. While GPT-5.4 Nano's 128K max output seems advantageous, most coding tasks rarely exceed 30K tokens of output, making Grok's limitation negligible for 99% of use cases.
Despite feature parity, Grok 4 Fast's superior 75/100 score likely stems from xAI's focus on code-specific training data and optimization, while OpenAI's GPT-5.4 Nano at 61/100 appears to be a smaller variant optimized for cost rather than peak performance. The 'Fast' designation and #2 ranking suggest xAI has specifically tuned for low-latency code generation workloads.
With Grok 4 Fast offering 23% better performance (75 vs 61), 60% cheaper output pricing ($0.50 vs $1.25/M), and 5x larger context windows (2.0M vs 400K), migration is compelling for most coding workloads. The only hesitation would be for applications generating over 30K tokens per request or teams deeply integrated with OpenAI's ecosystem, though the 11-position rank difference strongly favors switching.