GPT-5.1 Thinking vs Grok-4 Heavy: Specs & Benchmark Comparison
| Characteristic | GPT-5.1 Thinking | Grok-4 Heavy |
|---|---|---|
| Company | OpenAI | xAI |
| Release Date | November 11, 2025 | July 8, 2025 |
| Parameters | — | — |
| Multimodal | Yes | Yes |
| Context (input) | 256K | — |
| Context (output) | 128K | — |
| Input Price / 1M | $3.00 | — |
| Output Price / 1M | $12.00 | — |
| Average Score | 0.9 | 0.8 |
| Benchmarks | ||
| AIME 2025 | 0.9 | 1.0 |
| GPQA | 0.9 | 0.9 |
Visual Benchmark Comparison
GPT-5.1 Thinking
Grok-4 Heavy
AIME 20250.9 vs 1.0
0.9
1.0
GPQA0.9 vs 0.9
0.9
0.9
Verdict
GPT-5.1 Thinking leads in 1 out of 2 comparison categories.
Overall Performance
Both models show comparable average scores: GPT-5.1 Thinking — 0.9, Grok-4 Heavy — 0.8.
Recency
GPT-5.1 Thinking is newer: released 11/11/2025 vs 7/8/2025.
More About These Models
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Frequently Asked Questions
Which is better for coding — GPT-5.1 Thinking or Grok-4 Heavy?
Direct comparison on the SWE-Bench benchmark is not available. We recommend reviewing other metrics on the comparison page.
Which model is cheaper — GPT-5.1 Thinking or Grok-4 Heavy?
API pricing data is available on the individual model pages.
Which has a larger context window — GPT-5.1 Thinking or Grok-4 Heavy?
Context window data is available on the individual model pages.
The GPT-5.1 Thinking and Grok-4 Heavy comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the GPT-5.1 Thinking or Grok-4 Heavy page. See also the complete list of AI model comparisons.