| Signal | GPT-5.4 | Delta | Grok 4 Fast |
|---|---|---|---|
Capabilities | 100 | -- | |
Benchmarks | 90 | +21 | |
Pricing | 85 | -14 | |
Context window size | 96 | -4 | |
Recency | 100 | +10 | |
Output Capacity | 85 | +11 | |
| Overall Result | 3 wins | of 6 | 2 wins |
Score History
91.9
current score
GPT-5.4
right now
72.5
current score
OpenAI
xAI
Grok 4 Fast saves you $955.00/month
That's $11460.00/year compared to GPT-5.4 at your current usage level of 100K calls/month.
| Metric | GPT-5.4 | Grok 4 Fast | Winner |
|---|---|---|---|
| Overall Score | 92 | 73 | GPT-5.4 |
| Rank | #2 | #80 | GPT-5.4 |
| Quality Rank | #2 | #80 | GPT-5.4 |
| Adoption Rank | #2 | #80 | GPT-5.4 |
| Parameters | -- | -- | -- |
| Context Window | 1050K | 2000K | Grok 4 Fast |
| Pricing | $2.50/$15.00/M | $0.20/$0.50/M | -- |
| Signal Scores | |||
| Capabilities | 100 | 100 | GPT-5.4 |
| Benchmarks | 90 | 70 | GPT-5.4 |
| Pricing | 85 | 100 | Grok 4 Fast |
| Context window size | 96 | 100 | Grok 4 Fast |
| Recency | 100 | 90 | GPT-5.4 |
| Output Capacity | 85 | 75 | GPT-5.4 |
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 92/100 (rank #2), placing it in the top 100% of all 290 models tracked.
Scores 73/100 (rank #80), placing it in the top 73% of all 290 models tracked.
GPT-5.4 has a 19-point advantage, which typically translates to noticeably stronger performance on complex reasoning, code generation, and multi-step tasks.
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 $262.50/month with GPT-5.4 - a $252.00 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 (92/100) 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 clearly outperforms Grok 4 Fast with a significant 19.400000000000006-point lead. For most general use cases, GPT-5.4 is the stronger choice. However, Grok 4 Fast may still excel in niche scenarios.
Best for Quality
GPT-5.4
Marginally better benchmark scores; both are excellent
Best for Cost
Grok 4 Fast
96% lower pricing; better value at scale
Best for Reliability
GPT-5.4
Higher uptime and faster response speeds
Best for Prototyping
GPT-5.4
Stronger community support and better developer experience
Best for Production
GPT-5.4
Wider enterprise adoption and proven at scale
by OpenAI
| Capability | GPT-5.4 | Grok 4 Fast |
|---|---|---|
| Vision (Image Input) | ||
| Function Calling | ||
| Streaming | ||
| JSON Mode | ||
| Reasoning | ||
| Web Search | ||
| Image Output |
OpenAI
xAI
Grok 4 Fast saves you $21.54/month
That's 96% cheaper than GPT-5.4 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 | Grok 4 Fast |
|---|---|---|
| Context Window | 1.1M | 2M |
| Max Output Tokens | 128,000 | 30,000 |
| Open Source | No | No |
| Created | Mar 5, 2026 | Sep 19, 2025 |
The 8-point performance gap (75 vs 67) represents a significant 12% improvement in coding benchmarks, placing Grok 4 Fast among the elite coding models. However, GPT-5.4's $15/M output tokens vs Grok's $0.50/M makes sustained code generation workloads 30x more expensive, which could translate to thousands of dollars monthly for teams generating millions of tokens.
Grok 4 Fast's 1.9x larger context window (2M vs 1.1M tokens) allows processing entire medium-sized repositories in a single pass, while GPT-5.4 might require chunking. Paradoxically, GPT-5.4's 4.3x larger max output (128K vs 30K) makes it superior for massive refactoring operations where you need to generate entire new modules, though at that 30x output cost premium.
With 8M input and 2M output tokens monthly, Grok 4 Fast costs $2.60 total ($1.60 input + $1.00 output) while GPT-5.4 runs $50 total ($20 input + $30 output) - a 19x difference. This $600/year vs $11,520/year gap means Grok 4 Fast enables experimentation at scale that would be prohibitive with GPT-5.4's pricing model.
The score gap likely reflects Grok 4 Fast's superior handling of complex multi-file debugging and architectural decisions, as xAI's model was specifically optimized for coding tasks. GPT-5.4's lower score at rank #5 suggests it struggles more with edge cases in code generation, though its 128K max output allows generating entire applications in one shot versus Grok's 30K limit.
OpenAI's mature ecosystem offers battle-tested SDKs and extensive community support, potentially offsetting the rank gap (#5 vs #2) for risk-averse enterprises. However, xAI's focused optimization yielding that 75/100 score combined with 30x cheaper output pricing makes it compelling for startups prioritizing performance-per-dollar over ecosystem maturity.