# GPT-5.3 Chat vs Grok 4

> Grok 4 is the stronger model overall, scoring 48.1 to 42.8 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-5-3-chat-vs-grok-4
- Last updated: 2026-10-10
- Shared benchmarks: 17

## Summary

- They share 17 benchmarks with published results for both. GPT-5.3 Chat scores higher in 1 category and Grok 4 in 7 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in long context, where Grok 4 leads 63.1 to 42.6.

## Snapshot

| | GPT-5.3 Chat | Grok 4 |
|---|---|---|
| Provider | OpenAI | xAI |
| Noometry Index | 42.8 | 48.1 |
| Rank | 109 | 56 |
| Context | 128K | — |
| Input $/M | $1.75 | — |
| Output $/M | $14 | — |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-5.3 Chat: 41.4 (#124)
- Grok 4: 50.3 (#46)

| Benchmark | GPT-5.3 Chat | Grok 4 |
|---|---|---|
| LMArena Coding | 1408 | 1408 |
| Aider Polyglot | — | 79.6% |
| WeirdML | — | 45.7% |

## Agentic & Tool Use

- GPT-5.3 Chat: —
- Grok 4: 32.3 (#68)

| Benchmark | GPT-5.3 Chat | Grok 4 |
|---|---|---|
| Terminal-Bench | — | 27.2% |
| Berkeley Function Calling Leaderboard | — | 63% |
| GDPval | — | 21.1% |
| Cybench | — | 43% |
| DeepResearch Bench | — | 47.3% |
| BALROG | — | 43.6% |
| LMArena Search | — | 1142 |
| METR Time Horizons | — | 66.6% |

## Reasoning

- GPT-5.3 Chat: 28.5 (#102)
- Grok 4: 36.7 (#65)

| Benchmark | GPT-5.3 Chat | Grok 4 |
|---|---|---|
| LMArena Hard Prompts | 1399 | 1409 |
| ARC-AGI-2 | — | 16% |
| SimpleBench | — | 60.5% |
| Kagi LLM Benchmark | — | 73.6% |
| ARC-AGI-1 | — | 66.7% |
| Chess Puzzles | — | 28% |
| Epoch Capabilities Index | — | 146.44 |
| ForecastBench | — | 60.9 |

## Math

- GPT-5.3 Chat: 38.2 (#142)
- Grok 4: 48.4 (#64)

| Benchmark | GPT-5.3 Chat | Grok 4 |
|---|---|---|
| LMArena Math | 1389 | 1422 |
| OTIS Mock AIME 2024-2025 | — | 84% |
| Omni-MATH | — | 60.3% |
| FrontierMath (Feb 2025 set) | — | 19.7% |
| FrontierMath Tier 4 (v1) | — | 2.1% |

## Knowledge

- GPT-5.3 Chat: 38.8 (#140)
- Grok 4: 53.8 (#55)

| Benchmark | GPT-5.3 Chat | Grok 4 |
|---|---|---|
| LMArena Expert | 1397 | 1415 |
| GPQA Diamond | — | 87% |
| MMLU-Pro | — | 85.1% |
| Confabulations | — | 12.4% |
| GPQA (HELM) | — | 72.7% |

## Multimodal

- GPT-5.3 Chat: —
- Grok 4: 33.7 (#94)

| Benchmark | GPT-5.3 Chat | Grok 4 |
|---|---|---|
| LMArena Vision | — | 1210 |
| GeoBench | — | 45% |

## Multilingual

- GPT-5.3 Chat: 50.3 (#124)
- Grok 4: 51.8 (#103)

| Benchmark | GPT-5.3 Chat | Grok 4 |
|---|---|---|
| LMArena Non-English | 1382 | 1403 |
| LMArena Chinese | 1432 | 1427 |
| LMArena French | 1397 | 1418 |
| LMArena German | 1384 | 1429 |
| LMArena Japanese | 1352 | 1394 |
| LMArena Korean | 1346 | 1377 |
| LMArena Russian | 1400 | 1410 |
| LMArena Spanish | 1371 | 1420 |

## Instruction Following

- GPT-5.3 Chat: 72.8 (#129)
- Grok 4: 79.2 (#5)

| Benchmark | GPT-5.3 Chat | Grok 4 |
|---|---|---|
| LMArena Instruction Following | 1378 | 1387 |
| IFEval | — | 94.9% |

## Long Context

- GPT-5.3 Chat: 42.6 (#120)
- Grok 4: 63.1 (#4)

| Benchmark | GPT-5.3 Chat | Grok 4 |
|---|---|---|
| LMArena Longer Query | 1396 | 1409 |
| Fiction.LiveBench | — | 94.4% |

## Writing & Preference

- GPT-5.3 Chat: 63.1 (#68)
- Grok 4: 58.5 (#116)

| Benchmark | GPT-5.3 Chat | Grok 4 |
|---|---|---|
| LMArena Text | 1389 | 1411 |
| LMArena Creative Writing | 1355 | 1397 |
| LMArena Multi-Turn | 1412 | 1416 |
| Short-Story Creative Writing | — | 76.9% |
| EQ-Bench Creative Writing | 1690 | — |
| WildBench | — | 79.7% |

## FAQ

### Is GPT-5.3 Chat better than Grok 4?

Grok 4 is the stronger model overall, scoring 48.1 to 42.8 on the Noometry Index.

### Is GPT-5.3 Chat or Grok 4 better for coding?

Grok 4 scores higher on coding benchmarks: 50.3 versus 41.4 in the Noometry coding category.

### How many benchmarks do GPT-5.3 Chat and Grok 4 share?

17 benchmarks have published results for both models. GPT-5.3 Chat has 18 scored results on Noometry and Grok 4 has 48.