Model Comparison
Grok 4.3 (low)
vs. GPT-5.5 (xhigh)
Comparing 2 AI models · 7 benchmarks · xAI, OpenAI
Recommended Pick
Op GPT-5.5 (xhigh) 9 metric wins Strongest on: Reasoning, Intelligence, Coding
Best Value
Grok 4.3 (low)
100.0 value score
48.5 reasoning / $1.56/1M
Lowest Price
Grok 4.3 (low)
$1.25/1M input price
Best Reasoning
GPT-5.5 (xhigh)
66.0 reasoning score
Blends available reasoning benchmarks
Best for Coding
GPT-5.5 (xhigh)
59.1 coding index
Composite Indices
Higher is better; speed and price are normalized
Standard Benchmarks
Only benchmarks with data are shown
Differences That Matter
Best value
Grok 4.3 (low) has the strongest quality-to-price mix at 100.0 out of 100 value points.
Price gap
Grok 4.3 (low) is 4.0x cheaper on input tokens than GPT-5.5 (xhigh).
Speed gap
Grok 4.3 (low) generates about 2.6x as many tokens per second as GPT-5.5 (xhigh).
Reasoning gap
GPT-5.5 (xhigh) leads Grok 4.3 (low) by 17.5 points on reasoning.
Coding gap
GPT-5.5 (xhigh) leads Grok 4.3 (low) by 27.5 points on coding.
Response Face-Off
Run one prompt through the selected models and compare response quality with live speed and cost context.
Grok 4.3 (low)
xAI
TTFT
—
Time
—
tok/s
—
Tokens
—
Cost
—
GPT-5.5 (xhigh)
OpenAI
TTFT
—
Time
—
tok/s
—
Tokens
—
Cost
—
Which answer was more useful?
Full Comparison
| Metric | xA Grok 4.3 (low) | Top Pick Op GPT-5.5 (xhigh) |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $1.25/1M | $5.00/1M |
| Output Cost | $2.50/1M | $30.00/1M |
| Blended (3:1) | $1.56/1M | $11.25/1M |
| Specifications | ||
| Organization | xAI | OpenAI |
| Release Date | Apr 30, 2026 | Apr 23, 2026 |
| Performance & Speed | ||
| Throughput | 163.2 tok/s | 63.7 tok/s |
| TTFT | 4346ms | 76061ms |
| Latency | 4346ms | 76061ms |
| Composite Indices | ||
| Value Score | 100.0 | 18.9 |
| Reasoning Score | 48.5 | 66.0 |
| Intelligence | 43.9 | 60.2 |
| Coding | 31.6 | 59.1 |
| Standard Benchmarks | ||
| GPQA | 84.3% | 93.5% |
| HLE | 17.3% | 44.3% |
| SciCode | 41.9% | 56.1% |
| LCR | 64.0% | 74.3% |
| IFBench | 81.0% | 75.9% |
| TAU-bench v2 | 88.9% | 93.9% |
| TerminalBench Hard | 26.5% | 60.6% |
Key Takeaways
Grok 4.3 (low) offers the best value at $1.25/1M, making it ideal for high-volume applications and cost-conscious projects.
GPT-5.5 (xhigh) has the strongest reasoning profile with a 66.0 reasoning score, combining the available reasoning-heavy benchmarks.
GPT-5.5 (xhigh) reaches a 59.1 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
Grok 4.3 (low)
- Cost-sensitive applications
- High-volume processing
GPT-5.5 (xhigh)
- Complex reasoning tasks
- Research & analysis
- Code generation
- Software development
