Model Comparison
GPT-5 (high)
vs. Grok Code Fast 1
Comparing 2 AI models · 12 benchmarks · OpenAI, xAI
Recommended Pick
Op GPT-5 (high) 15 metric wins Strongest on: Throughput, Reasoning, Intelligence
Lowest Price
Grok Code Fast 1
$0.00/1M input price
Best Reasoning
GPT-5 (high)
77.2 reasoning score
Blends available reasoning benchmarks
Best for Coding
GPT-5 (high)
36.0 coding index
Composite Indices
Higher is better; speed and price are normalized
Standard Benchmarks
Only benchmarks with data are shown
Differences That Matter
Price gap
Grok Code Fast 1 is ∞x cheaper on input tokens than GPT-5 (high).
Reasoning gap
GPT-5 (high) leads Grok Code Fast 1 by 38.1 points on reasoning.
Coding gap
GPT-5 (high) leads Grok Code Fast 1 by 12.3 points on coding.
Top-pick rationale
GPT-5 (high) wins 15 measurable categories, including Throughput, Reasoning, Intelligence, Coding.
Response Face-Off
Run one prompt through the selected models and compare response quality with live speed and cost context.
GPT-5 (high)
OpenAI
TTFT
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Time
—
tok/s
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Tokens
—
Cost
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Grok Code Fast 1
xAI
TTFT
—
Time
—
tok/s
—
Tokens
—
Cost
—
Which answer was more useful?
Full Comparison
| Metric | Top Pick Op GPT-5 (high) | xA Grok Code Fast 1 |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $1.25/1M | $0.00/1M |
| Output Cost | $10.00/1M | $0.00/1M |
| Blended (3:1) | $3.44/1M | — |
| Specifications | ||
| Organization | OpenAI | xAI |
| Release Date | Aug 7, 2025 | Aug 28, 2025 |
| Performance & Speed | ||
| Throughput | 125.1 tok/s | — |
| TTFT | 81605ms | — |
| Latency | 81605ms | — |
| Composite Indices | ||
| Value Score | 100.0 | — |
| Reasoning Score | 77.2 | 39.1 |
| Intelligence | 44.6 | 28.7 |
| Coding | 36.0 | 23.7 |
| Math | 94.3 | 43.3 |
| Standard Benchmarks | ||
| GPQA | 85.4% | 72.7% |
| MMLU Pro | 87.1% | 79.3% |
| HLE | 26.5% | 7.5% |
| LiveCodeBench | 84.6% | 65.7% |
| MATH 500 | 99.4% | — |
| AIME 2025 | 94.3% | 43.3% |
| AIME (Original) | 95.7% | — |
| SciCode | 42.9% | 36.2% |
| LCR | 75.6% | 48.3% |
| IFBench | 73.1% | 41.4% |
| TAU-bench v2 | 84.8% | 75.7% |
| TerminalBench Hard | 32.6% | 17.4% |
Key Takeaways
Grok Code Fast 1 offers the best value at $0.00/1M, making it ideal for high-volume applications and cost-conscious projects.
GPT-5 (high) has the strongest reasoning profile with a 77.2 reasoning score, combining the available reasoning-heavy benchmarks.
GPT-5 (high) reaches a 36.0 coding index, making it the top choice for software development and code generation tasks.
All models support context windows of ∞+ tokens, suitable for processing lengthy documents and maintaining extended conversations.
When to Choose Each Model
GPT-5 (high)
- Complex reasoning tasks
- Research & analysis
- Code generation
- Software development
Grok Code Fast 1
- Cost-sensitive applications
- High-volume processing
