Model comparison
GPT-5.3 Chat vs Grok-2 (Dec 2024)
GPT-5.3 Chat is the stronger model overall, scoring 42.8 to 33.7 on the Noometry Index.
Last verified . 17 shared benchmarks.
Summary
- They share 17 benchmarks with published results for both. GPT-5.3 Chat scores higher in 8 categories and Grok-2 (Dec 2024) in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in math, where GPT-5.3 Chat leads 38.2 to 20.8.
Side by side
| GPT-5.3 Chat | Grok-2 (Dec 2024) | |
|---|---|---|
| Provider | OpenAI | xAI |
| Noometry Index | 42.8 | 33.7 |
| Released | 2026-03-03 | 2024-08-13 |
| Weights | Proprietary | Proprietary |
| Context window | 128K | — |
| Max output | 16K | — |
| Input $ / M tokens | $1.75 | — |
| Output $ / M tokens | $14 | — |
| Results tracked | 18 | 34 |
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Category by category
Coding GPT-5.3 Chat leads
GPT-5.3 Chat: 41.4 (#124), Grok-2 (Dec 2024): 33.3 (#258)
| Benchmark | GPT-5.3 Chat | Grok-2 (Dec 2024) |
|---|---|---|
| LMArena Coding | 1408 | 1287 |
| WeirdML | — | 22.2% |
| LiveBench Coding | — | 46.4% |
Reasoning GPT-5.3 Chat leads
GPT-5.3 Chat: 28.5 (#102), Grok-2 (Dec 2024): 16.9 (#299)
| Benchmark | GPT-5.3 Chat | Grok-2 (Dec 2024) |
|---|---|---|
| LMArena Hard Prompts | 1399 | 1272 |
| SimpleBench | — | 22.7% |
| LiveBench Reasoning | — | 54.8% |
| DTBench | — | 65.2% |
| LiveBench Data Analysis | — | 54.5% |
| Epoch Capabilities Index | — | 130.48 |
| LiveBench | — | 54.3% |
Math GPT-5.3 Chat leads
GPT-5.3 Chat: 38.2 (#142), Grok-2 (Dec 2024): 20.8 (#284)
| Benchmark | GPT-5.3 Chat | Grok-2 (Dec 2024) |
|---|---|---|
| LMArena Math | 1389 | 1283 |
| OTIS Mock AIME 2024-2025 | — | 11.5% |
| LiveBench Math | — | 54.9% |
| MATH Level 5 | — | 63.5% |
| FrontierMath (Feb 2025 set) | — | 0.7% |
Knowledge GPT-5.3 Chat leads
GPT-5.3 Chat: 38.8 (#140), Grok-2 (Dec 2024): 29.8 (#233)
| Benchmark | GPT-5.3 Chat | Grok-2 (Dec 2024) |
|---|---|---|
| LMArena Expert | 1397 | 1254 |
| GPQA Diamond | — | 53.8% |
| Confabulations | — | 20.1% |
Multilingual GPT-5.3 Chat leads
GPT-5.3 Chat: 50.3 (#124), Grok-2 (Dec 2024): 43.1 (#188)
| Benchmark | GPT-5.3 Chat | Grok-2 (Dec 2024) |
|---|---|---|
| LMArena Non-English | 1382 | 1282 |
| LMArena Chinese | 1432 | 1289 |
| LMArena French | 1397 | 1318 |
| LMArena German | 1384 | 1287 |
| LMArena Japanese | 1352 | 1244 |
| LMArena Korean | 1346 | 1237 |
| LMArena Russian | 1400 | 1286 |
| LMArena Spanish | 1371 | 1281 |
Instruction Following GPT-5.3 Chat leads
GPT-5.3 Chat: 72.8 (#129), Grok-2 (Dec 2024): 66.9 (#202)
| Benchmark | GPT-5.3 Chat | Grok-2 (Dec 2024) |
|---|---|---|
| LMArena Instruction Following | 1378 | 1270 |
| LiveBench Instruction Following | — | 69.6% |
Long Context GPT-5.3 Chat leads
GPT-5.3 Chat: 42.6 (#120), Grok-2 (Dec 2024): 38.8 (#190)
| Benchmark | GPT-5.3 Chat | Grok-2 (Dec 2024) |
|---|---|---|
| LMArena Longer Query | 1396 | 1276 |
Writing & Preference GPT-5.3 Chat leads
GPT-5.3 Chat: 63.1 (#68), Grok-2 (Dec 2024): 48.6 (#198)
| Benchmark | GPT-5.3 Chat | Grok-2 (Dec 2024) |
|---|---|---|
| LMArena Text | 1389 | 1305 |
| LMArena Creative Writing | 1355 | 1284 |
| LMArena Multi-Turn | 1412 | 1290 |
| Short-Story Creative Writing | — | 63.6% |
| EQ-Bench Creative Writing | 1690 | — |
| LiveBench Language | — | 45.6% |
Frequently asked questions
Is GPT-5.3 Chat better than Grok-2 (Dec 2024)?
GPT-5.3 Chat is the stronger model overall, scoring 42.8 to 33.7 on the Noometry Index.
Is GPT-5.3 Chat or Grok-2 (Dec 2024) better for coding?
GPT-5.3 Chat scores higher on coding benchmarks: 41.4 versus 33.3 in the Noometry coding category.
How many benchmarks do GPT-5.3 Chat and Grok-2 (Dec 2024) share?
17 benchmarks have published results for both models. GPT-5.3 Chat has 18 scored results on Noometry and Grok-2 (Dec 2024) has 34.