Compare / head-to-head
GPT-5.2vs
Grok 4.1 Fast Reasoning
GPT-5.2 leads 4 of 5 shared benchmarks. Grok 4.1 Fast Reasoning is 22.5x cheaper per token. Grok 4.1 Fast Reasoning has the larger context window (2M tokens).
Benchmarks from cited public sources; pricing from official pages; status from official provider feeds.
Shared benchmarks
4 – 1
GPT-5.2 leads
Cheaper per token
Grok 4.1 Fast Reasoning
22.5x cheaper, input + output
Larger context
Grok 4.1 Fast Reasoning
2M tokens
Providers
2 providers
OpenAI · xAI
GPT-5.2
OpenAI · released 2025-12-11
textvision
Grok 4.1 Fast Reasoning
xAI · released 2025-11-19
text
Quality
Benchmark matrix
5 shared · 31 only GPT-5.2 · 2 only Grok 4.1 Fast Reasoning| Benchmark | GPT-5.2 | Grok 4.1 Fast Reasoning | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 5 | ||||
| LMArena Elo | 1412.4 ↗ | 1430.3 ↗ | -17.9 | Grok 4.1 Fast Reasoning |
| LMArena Vision (LMArena) | 1242.8 ↗ | 1196.3 ↗ | +46.5 | GPT-5.2 |
| LMArena WebDev (LMArena) | 1415.5 ↗ | 1241.3 ↗ | +174.2 | GPT-5.2 |
| SAGE (Vals AI) | 49.3% ↗ | 31.3% ↗ | +18 pt | GPT-5.2 |
| Vending-Bench 2 (Andon Labs) | 3591.33 ↗ | 1106.63 ↗ | +2484.7 | GPT-5.2 |
| Only GPT-5.2 reports · 31 | ||||
| SWE-bench Verified | 80% ↗ | not reported | — | — |
| GPQA Diamond | 92.4% ↗ | not reported | — | — |
| AIME 2025 | 100% ↗ | not reported | — | — |
| AIME 2026 | 98.3% ↗matharena | not reported | — | — |
| ARC-AGI-1 (Verified) | 86.2% ↗ | not reported | — | — |
| ARC-AGI-2 (Verified) | 52.9% ↗ | not reported | — | — |
| Chess Puzzles (Epoch AI run) | 49% ↗epoch run | not reported | — | — |
| EBR-bench (Epoch AI run) | 23% ↗epoch run | not reported | — | — |
| FrontierMath Tier 4 v2 (Epoch AI run) | 31.7% ↗epoch run | not reported | — | — |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | 67.4% ↗epoch run | not reported | — | — |
| Furniture Assembly (Epoch AI run) | 38.3% ↗epoch run | not reported | — | — |
| GDPval (wins or ties) | 70.9% ↗ | not reported | — | — |
| GSO Opt@1 (GSO) | 26.5% ↗ | not reported | — | — |
| LiveBench Agentic Coding (LiveBench) | 50.3% ↗ | not reported | — | — |
| LiveBench Coding (LiveBench) | 76.1% ↗ | not reported | — | — |
| LiveBench Data Analysis (LiveBench) | 78.2% ↗ | not reported | — | — |
| LiveBench Instruction Following (LiveBench) | 61.8% ↗ | not reported | — | — |
| LiveBench Language (LiveBench) | 79.8% ↗ | not reported | — | — |
| LiveBench Mathematics (LiveBench) | 93.2% ↗ | not reported | — | — |
| LiveBench Reasoning (LiveBench) | 83.2% ↗ | not reported | — | — |
| Mystery Game Puzzles (Epoch AI run) | 23% ↗epoch run | not reported | — | — |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 96.1% ↗epoch run | not reported | — | — |
| SimpleBench (SimpleBench) | 45.8% ↗ | not reported | — | — |
| SimpleQA Verified | 37.1% ↗epoch run | not reported | — | — |
| SWE-Bench Pro | 55.6% ↗ | not reported | — | — |
| SWE-bench Verified (Epoch AI run) | 73.8% ↗epoch run | not reported | — | — |
| tau2-bench Airline (Sierra) | 83% ↗ | not reported | — | — |
| tau2-bench Banking Knowledge (Sierra) | 32.2% ↗ | not reported | — | — |
| tau2-bench Retail (Sierra) | 81.6% ↗ | not reported | — | — |
| tau2-bench Telecom (Sierra) | 89.7% ↗ | not reported | — | — |
| WeirdML (Håvard Tveit Ihle) | 72.2% ↗ | not reported | — | — |
| Only Grok 4.1 Fast Reasoning reports · 2 | ||||
| FRAMES (Agent Tools API) | not reported | 87.6% ↗ | — | — |
| Research-Eval Reka (Agent Tools API) | not reported | 63.9% ↗ | — | — |
Scores tagged "epoch" or "matharena" are independent runs, used only where the lab has not published its own; ⚠ marks rows MathArena flags as released after the competition. Higher is better on every row. Δ is GPT-5.2 minus Grok 4.1 Fast Reasoning in the benchmark's own unit. "Not reported" means the lab has not published that figure; it is not a zero. ↗ opens the source.
Specs & pricing
Side by side
Official pricing pages and model cards| Spec | GPT-5.2 | Grok 4.1 Fast Reasoning | Edge |
|---|---|---|---|
| Context window | 400K tokens | 2M tokens | Grok 4.1 Fast Reasoning |
| Max output | 128K tokens | — | — |
| Input price / 1M | $1.75 ↗ | $0.2 ↗ | Grok 4.1 Fast Reasoning |
| Output price / 1M | $14 ↗ | $0.5 ↗ | Grok 4.1 Fast Reasoning |
| Cached input / 1M | $0.175 ↗ | $0.05 ↗ | Grok 4.1 Fast Reasoning |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $15.75 | $0.7 | Grok 4.1 Fast Reasoning |
| Modalities | text · vision | text | GPT-5.2 |
| Released | 2025-12-11 | 2025-11-19 | — |
| Cited benchmark scores | 45 | 7 | — |
Reliability
Provider status
Live from /statusMore matchups
GPT-5.2 vs …
Models sharing the most benchmarksMore matchups
Grok 4.1 Fast Reasoning vs …
Models sharing the most benchmarksBuilt by Respan
Which one wins on your data?
Public benchmarks are a starting point. Run GPT-5.2 and Grok 4.1 Fast Reasoning on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.