Model comparison
GPT-5.4 Pro vs Grok 4 Heavy
GPT-5.4 Pro has enough public results to be ranked (#16); Grok 4 Heavy does not yet, so treat this comparison as directional.
Last verified . 1 shared benchmarks.
Summary
- They share 1 benchmark with published results for both.
Side by side
| GPT-5.4 Pro | Grok 4 Heavy | |
|---|---|---|
| Provider | OpenAI | xAI |
| Noometry Index | 58.8 | — |
| Released | 2026-03-05 | 2025-07-10 |
| Weights | Proprietary | Proprietary |
| Context window | 1.05M | — |
| Max output | 128K | — |
| Input $ / M tokens | $30 | — |
| Output $ / M tokens | $180 | — |
| Results tracked | 16 | 1 |
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Category by category
Coding Not comparable
GPT-5.4 Pro: 42.6 (#89), Grok 4 Heavy: —
| Benchmark | GPT-5.4 Pro | Grok 4 Heavy |
|---|---|---|
| WeirdML | 57.4% | — |
Reasoning Not comparable
GPT-5.4 Pro: 71.0 (#10), Grok 4 Heavy: —
| Benchmark | GPT-5.4 Pro | Grok 4 Heavy |
|---|---|---|
| ARC-AGI-2 | 83.3% | — |
| SimpleBench | 74.1% | — |
| ARC-AGI-1 | 94.5% | — |
| CritPt | 30% | — |
| Chess Puzzles | 58.6% | — |
| EnigmaEval | 23.8% | — |
| Epoch Capabilities Index | 159.12 | — |
Math Not comparable
GPT-5.4 Pro: 72.0 (#17), Grok 4 Heavy: —
| Benchmark | GPT-5.4 Pro | Grok 4 Heavy |
|---|---|---|
| FrontierMath Tier 4 (v1) | 37.5% | 2.1% |
| FrontierMath (Tiers 1-3) | 82.5% | — |
| FrontierMath Tier 4 | 58.5% | — |
| FrontierMath (Feb 2025 set) | 50% | — |
Knowledge Not comparable
GPT-5.4 Pro: 68.3 (#6), Grok 4 Heavy: —
| Benchmark | GPT-5.4 Pro | Grok 4 Heavy |
|---|---|---|
| GPQA Diamond | 94.6% | — |
| Humanity's Last Exam | 44.3% | — |
| SimpleQA Verified | 46.3% | — |
| Vectara Hallucination Rate | 8.3% | — |
Frequently asked questions
Is GPT-5.4 Pro better than Grok 4 Heavy?
GPT-5.4 Pro has enough public results to be ranked (#16); Grok 4 Heavy does not yet, so treat this comparison as directional.
How many benchmarks do GPT-5.4 Pro and Grok 4 Heavy share?
1 benchmark has published results for both models. GPT-5.4 Pro has 16 scored results on Noometry and Grok 4 Heavy has 1.