Model comparison
GPT-5.4 Pro vs Grok 4 Fast
GPT-5.4 Pro is the stronger model overall, scoring 58.9 to 39.4 on the Noometry Index.
Last verified . 5 shared benchmarks.
Summary
- They share 5 benchmarks with published results for both. GPT-5.4 Pro scores higher in 4 categories and Grok 4 Fast in 0 categories; 4 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where GPT-5.4 Pro leads 70.7 to 22.2.
- The biggest single-benchmark swing is ARC-AGI-2: 83.3% for GPT-5.4 Pro and 5.3% for Grok 4 Fast.
Side by side
| GPT-5.4 Pro | Grok 4 Fast | |
|---|---|---|
| Provider | OpenAI | xAI |
| Noometry Index | 58.9 | 39.4 |
| Released | 2026-03-05 | 2025-09-19 |
| Weights | Proprietary | Proprietary |
| Context window | 1.05M | — |
| Max output | 128K | — |
| Input $ / M tokens | $30 | — |
| Output $ / M tokens | $180 | — |
| Results tracked | 16 | 30 |
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Category by category
Coding GPT-5.4 Pro leads
GPT-5.4 Pro: 43.2 (#90), Grok 4 Fast: 32.5 (#271)
| Benchmark | GPT-5.4 Pro | Grok 4 Fast |
|---|---|---|
| WeirdML | 57.4% | 42.9% |
| LMArena WebDev | — | 1159 |
| LMArena Coding | — | 1429 |
Agentic & Tool Use Not comparable
GPT-5.4 Pro: —, Grok 4 Fast: 29.5 (#86)
| Benchmark | GPT-5.4 Pro | Grok 4 Fast |
|---|---|---|
| τ²-bench Banking | — | 15.7% |
| Cybench | — | 30% |
| LMArena Search | — | 1171 |
Reasoning GPT-5.4 Pro leads
GPT-5.4 Pro: 70.7 (#13), Grok 4 Fast: 22.2 (#201)
| Benchmark | GPT-5.4 Pro | Grok 4 Fast |
|---|---|---|
| ARC-AGI-2 | 83.3% | 5.3% |
| ARC-AGI-1 | 94.5% | 48.5% |
| Epoch Capabilities Index | 158.93 | 144.2 |
| SimpleBench | 74.1% | — |
| Kagi LLM Benchmark | — | 66.1% |
| CritPt | 30% | — |
| Chess Puzzles | 58.6% | — |
| EnigmaEval | 23.8% | — |
| LMArena Hard Prompts | — | 1412 |
| DTBench | — | 82.7% |
| ForecastBench | — | 60.5 |
Math GPT-5.4 Pro leads
GPT-5.4 Pro: 72.4 (#22), Grok 4 Fast: 38.9 (#123)
| Benchmark | GPT-5.4 Pro | Grok 4 Fast |
|---|---|---|
| FrontierMath (Tiers 1-3) | 82.5% | — |
| FrontierMath Tier 4 | 58.5% | — |
| LMArena Math | — | 1419 |
| FrontierMath (Feb 2025 set) | 50% | — |
| FrontierMath Tier 4 (v1) | 37.5% | — |
Knowledge GPT-5.4 Pro leads
GPT-5.4 Pro: 68.3 (#7), Grok 4 Fast: 32.0 (#214)
| Benchmark | GPT-5.4 Pro | Grok 4 Fast |
|---|---|---|
| Vectara Hallucination Rate | 8.3% | 19.7% |
| GPQA Diamond | 94.6% | — |
| Humanity's Last Exam | 44.3% | — |
| SimpleQA Verified | 46.3% | — |
| LMArena Expert | — | 1411 |
Multilingual Not comparable
GPT-5.4 Pro: —, Grok 4 Fast: 51.3 (#111)
| Benchmark | GPT-5.4 Pro | Grok 4 Fast |
|---|---|---|
| LMArena Non-English | — | 1396 |
| LMArena Chinese | — | 1457 |
| LMArena French | — | 1431 |
| LMArena German | — | 1383 |
| LMArena Japanese | — | 1352 |
| LMArena Korean | — | 1357 |
| LMArena Russian | — | 1389 |
| LMArena Spanish | — | 1415 |
Instruction Following Not comparable
GPT-5.4 Pro: —, Grok 4 Fast: 73.2 (#121)
| Benchmark | GPT-5.4 Pro | Grok 4 Fast |
|---|---|---|
| LMArena Instruction Following | — | 1387 |
Long Context Not comparable
GPT-5.4 Pro: —, Grok 4 Fast: 63.2 (#3)
| Benchmark | GPT-5.4 Pro | Grok 4 Fast |
|---|---|---|
| Fiction.LiveBench | — | 94.4% |
| LMArena Longer Query | — | 1415 |
Writing & Preference Not comparable
GPT-5.4 Pro: —, Grok 4 Fast: 60.0 (#102)
| Benchmark | GPT-5.4 Pro | Grok 4 Fast |
|---|---|---|
| LMArena Text | — | 1407 |
| LMArena Creative Writing | — | 1387 |
| LMArena Multi-Turn | — | 1414 |
Frequently asked questions
Is GPT-5.4 Pro better than Grok 4 Fast?
GPT-5.4 Pro is the stronger model overall, scoring 58.9 to 39.4 on the Noometry Index.
Is GPT-5.4 Pro or Grok 4 Fast better for coding?
GPT-5.4 Pro scores higher on coding benchmarks: 43.2 versus 32.5 in the Noometry coding category.
How many benchmarks do GPT-5.4 Pro and Grok 4 Fast share?
5 benchmarks have published results for both models. GPT-5.4 Pro has 16 scored results on Noometry and Grok 4 Fast has 30.