Model comparison
GPT-5.2 Pro vs Grok 4 Fast
GPT-5.2 Pro is the stronger model overall, scoring 52.3 to 39.4 on the Noometry Index.
Last verified . 3 shared benchmarks.
Summary
- They share 3 benchmarks with published results for both. GPT-5.2 Pro scores higher in 2 categories and Grok 4 Fast in 0 categories; 2 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where GPT-5.2 Pro leads 51.5 to 22.2.
- The biggest single-benchmark swing is ARC-AGI-2: 54.2% for GPT-5.2 Pro and 5.3% for Grok 4 Fast.
Side by side
| GPT-5.2 Pro | Grok 4 Fast | |
|---|---|---|
| Provider | OpenAI | xAI |
| Noometry Index | 52.3 | 39.4 |
| Released | 2025-12-11 | 2025-09-19 |
| Weights | Proprietary | Proprietary |
| Context window | 400K | — |
| Max output | 128K | — |
| Input $ / M tokens | $21 | — |
| Output $ / M tokens | $168 | — |
| Results tracked | 8 | 30 |
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Category by category
Coding Not comparable
GPT-5.2 Pro: —, Grok 4 Fast: 32.5 (#271)
| Benchmark | GPT-5.2 Pro | Grok 4 Fast |
|---|---|---|
| LMArena WebDev | — | 1159 |
| WeirdML | — | 42.9% |
| LMArena Coding | — | 1429 |
Agentic & Tool Use Not comparable
GPT-5.2 Pro: —, Grok 4 Fast: 29.5 (#86)
| Benchmark | GPT-5.2 Pro | Grok 4 Fast |
|---|---|---|
| τ²-bench Banking | — | 15.7% |
| Cybench | — | 30% |
| LMArena Search | — | 1171 |
Reasoning GPT-5.2 Pro leads
GPT-5.2 Pro: 51.5 (#33), Grok 4 Fast: 22.2 (#201)
| Benchmark | GPT-5.2 Pro | Grok 4 Fast |
|---|---|---|
| ARC-AGI-2 | 54.2% | 5.3% |
| ARC-AGI-1 | 90.5% | 48.5% |
| Epoch Capabilities Index | 155.4 | 144.2 |
| SimpleBench | 57.4% | — |
| Kagi LLM Benchmark | — | 66.1% |
| NYT Connections (extended) | 79.3% | — |
| LMArena Hard Prompts | — | 1412 |
| DTBench | — | 82.7% |
| ForecastBench | — | 60.5 |
Math GPT-5.2 Pro leads
GPT-5.2 Pro: 65.3 (#29), Grok 4 Fast: 38.9 (#123)
| Benchmark | GPT-5.2 Pro | Grok 4 Fast |
|---|---|---|
| FrontierMath (Tiers 1-3) | 74% | — |
| FrontierMath Tier 4 | 46% | — |
| LMArena Math | — | 1419 |
| FrontierMath Tier 4 (v1) | 31.3% | — |
Knowledge Not comparable
GPT-5.2 Pro: —, Grok 4 Fast: 32.0 (#214)
| Benchmark | GPT-5.2 Pro | Grok 4 Fast |
|---|---|---|
| Vectara Hallucination Rate | — | 19.7% |
| LMArena Expert | — | 1411 |
Multilingual Not comparable
GPT-5.2 Pro: —, Grok 4 Fast: 51.3 (#111)
| Benchmark | GPT-5.2 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-5.2 Pro: —, Grok 4 Fast: 73.2 (#121)
| Benchmark | GPT-5.2 Pro | Grok 4 Fast |
|---|---|---|
| LMArena Instruction Following | — | 1387 |
Long Context Not comparable
GPT-5.2 Pro: —, Grok 4 Fast: 63.2 (#3)
| Benchmark | GPT-5.2 Pro | Grok 4 Fast |
|---|---|---|
| Fiction.LiveBench | — | 94.4% |
| LMArena Longer Query | — | 1415 |
Writing & Preference Not comparable
GPT-5.2 Pro: —, Grok 4 Fast: 60.0 (#102)
| Benchmark | GPT-5.2 Pro | Grok 4 Fast |
|---|---|---|
| LMArena Text | — | 1407 |
| LMArena Creative Writing | — | 1387 |
| LMArena Multi-Turn | — | 1414 |
Frequently asked questions
Is GPT-5.2 Pro better than Grok 4 Fast?
GPT-5.2 Pro is the stronger model overall, scoring 52.3 to 39.4 on the Noometry Index.
How many benchmarks do GPT-5.2 Pro and Grok 4 Fast share?
3 benchmarks have published results for both models. GPT-5.2 Pro has 8 scored results on Noometry and Grok 4 Fast has 30.