Model comparison
GPT-5.5 Pro vs Grok-2 (Dec 2024)
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 33.7 on the Noometry Index.
Last verified . 6 shared benchmarks.
Summary
- They share 6 benchmarks with published results for both. GPT-5.5 Pro scores higher in 3 categories and Grok-2 (Dec 2024) in 0 categories; 3 gaps are clear of the uncertainty.
- The widest gap is in math, where GPT-5.5 Pro leads 84.0 to 20.8.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 100% for GPT-5.5 Pro and 11.5% for Grok-2 (Dec 2024).
Side by side
| GPT-5.5 Pro | Grok-2 (Dec 2024) | |
|---|---|---|
| Provider | OpenAI | xAI |
| Noometry Index | 64.3 | 33.7 |
| Released | 2026-04-23 | 2024-08-13 |
| Weights | Proprietary | Proprietary |
| Context window | 1.05M | — |
| Max output | 128K | — |
| Input $ / M tokens | $30 | — |
| Output $ / M tokens | $180 | — |
| Results tracked | 14 | 34 |
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Category by category
Coding Not comparable
GPT-5.5 Pro: —, Grok-2 (Dec 2024): 33.3 (#258)
| Benchmark | GPT-5.5 Pro | Grok-2 (Dec 2024) |
|---|---|---|
| WeirdML | — | 22.2% |
| LiveBench Coding | — | 46.4% |
| LMArena Coding | — | 1287 |
Reasoning GPT-5.5 Pro leads
GPT-5.5 Pro: 73.3 (#10), Grok-2 (Dec 2024): 16.9 (#299)
| Benchmark | GPT-5.5 Pro | Grok-2 (Dec 2024) |
|---|---|---|
| SimpleBench | 76.9% | 22.7% |
| DTBench | 96% | 65.2% |
| Epoch Capabilities Index | 162.07 | 130.48 |
| ARC-AGI-2 | 84.6% | — |
| ARC-AGI-1 | 96.5% | — |
| CritPt | 30.6% | — |
| Chess Puzzles | 64% | — |
| LiveBench Reasoning | — | 54.8% |
| LMArena Hard Prompts | — | 1272 |
| LiveBench Data Analysis | — | 54.5% |
| LMCA | 53.9% | — |
| LiveBench | — | 54.3% |
Math GPT-5.5 Pro leads
GPT-5.5 Pro: 84.0 (#10), Grok-2 (Dec 2024): 20.8 (#284)
| Benchmark | GPT-5.5 Pro | Grok-2 (Dec 2024) |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 100% | 11.5% |
| FrontierMath (Feb 2025 set) | 52.4% | 0.7% |
| FrontierMath (Tiers 1-3) | 87.7% | — |
| FrontierMath Tier 4 | 78% | — |
| LiveBench Math | — | 54.9% |
| LMArena Math | — | 1283 |
| MATH Level 5 | — | 63.5% |
| FrontierMath Tier 4 (v1) | 39.6% | — |
Knowledge GPT-5.5 Pro leads
GPT-5.5 Pro: 64.1 (#19), Grok-2 (Dec 2024): 29.8 (#233)
| Benchmark | GPT-5.5 Pro | Grok-2 (Dec 2024) |
|---|---|---|
| GPQA Diamond | 93.9% | 53.8% |
| Confabulations | — | 20.1% |
| LMArena Expert | — | 1254 |
Multilingual Not comparable
GPT-5.5 Pro: —, Grok-2 (Dec 2024): 43.1 (#188)
| Benchmark | GPT-5.5 Pro | Grok-2 (Dec 2024) |
|---|---|---|
| LMArena Non-English | — | 1282 |
| LMArena Chinese | — | 1289 |
| LMArena French | — | 1318 |
| LMArena German | — | 1287 |
| LMArena Japanese | — | 1244 |
| LMArena Korean | — | 1237 |
| LMArena Russian | — | 1286 |
| LMArena Spanish | — | 1281 |
Instruction Following Not comparable
GPT-5.5 Pro: —, Grok-2 (Dec 2024): 66.9 (#202)
| Benchmark | GPT-5.5 Pro | Grok-2 (Dec 2024) |
|---|---|---|
| LiveBench Instruction Following | — | 69.6% |
| LMArena Instruction Following | — | 1270 |
Long Context Not comparable
GPT-5.5 Pro: —, Grok-2 (Dec 2024): 38.8 (#190)
| Benchmark | GPT-5.5 Pro | Grok-2 (Dec 2024) |
|---|---|---|
| LMArena Longer Query | — | 1276 |
Writing & Preference Not comparable
GPT-5.5 Pro: —, Grok-2 (Dec 2024): 48.6 (#198)
| Benchmark | GPT-5.5 Pro | Grok-2 (Dec 2024) |
|---|---|---|
| LMArena Text | — | 1305 |
| LMArena Creative Writing | — | 1284 |
| Short-Story Creative Writing | — | 63.6% |
| LMArena Multi-Turn | — | 1290 |
| LiveBench Language | — | 45.6% |
Frequently asked questions
Is GPT-5.5 Pro better than Grok-2 (Dec 2024)?
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 33.7 on the Noometry Index.
How many benchmarks do GPT-5.5 Pro and Grok-2 (Dec 2024) share?
6 benchmarks have published results for both models. GPT-5.5 Pro has 14 scored results on Noometry and Grok-2 (Dec 2024) has 34.