# Grok 4.3 vs Grok 4.5

> Grok 4.5 is the stronger model overall, scoring 55.0 to 43.6 on the Noometry Index. Grok 4.3 costs 1.9× less per token, which makes it the better buy when Grok 4.5's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/grok-4-3-vs-grok-4-5
- Last updated: 2026-10-10
- Shared benchmarks: 38

## Summary

- They share 38 benchmarks with published results for both. Grok 4.3 scores higher in 0 categories and Grok 4.5 in 10 categories; 10 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.5 leads 56.0 to 34.9.
- The biggest single-benchmark swing is Blueprint-Bench 2: 0% for Grok 4.3 and 27.3% for Grok 4.5.
- Grok 4.3 is cheaper at $1.25 / $2.50 per million input/output tokens, against $2 / $6 for Grok 4.5.
- Grok 4.3 accepts more context: 1M tokens versus 500K.

## Snapshot

| | Grok 4.3 | Grok 4.5 |
|---|---|---|
| Provider | xAI | xAI |
| Noometry Index | 43.6 | 55.0 |
| Rank | 80 | 22 |
| Context | 1M | 500K |
| Input $/M | $1.25 | $2 |
| Output $/M | $2.50 | $6 |
| Weights | Proprietary | Proprietary |

## Coding

- Grok 4.3: 41.3 (#117)
- Grok 4.5: 51.7 (#34)

| Benchmark | Grok 4.3 | Grok 4.5 |
|---|---|---|
| LMArena WebDev | 1357 | 1552 |
| SciCode | 47.3% | 54.1% |
| WeirdML | 49.9% | 46.4% |
| LMArena Coding | 1415 | 1473 |
| ALE-Bench | 944.17 | 1,309 |
| DeepSWE | — | 53.8% |
| FrontierCode | — | 42.4% |

## Agentic & Tool Use

- Grok 4.3: 27.6 (#93)
- Grok 4.5: 44.4 (#15)

| Benchmark | Grok 4.3 | Grok 4.5 |
|---|---|---|
| GDP.pdf | 8% | 14% |
| LMArena Search | 1165 | 1213 |
| Vending-Bench 2 | 35.26 | 3,887 |
| APEX-Agents | — | 56.2% |
| τ²-bench Banking | — | 47.9% |
| PostTrainBench | — | 23.4% |
| GBAEval | — | 65.4% |

## Reasoning

- Grok 4.3: 34.9 (#60)
- Grok 4.5: 56.0 (#23)

| Benchmark | Grok 4.3 | Grok 4.5 |
|---|---|---|
| NYT Connections (extended) | 55.2% | 79.9% |
| CritPt | 8% | 15.4% |
| Chess Puzzles | 25% | 36% |
| LMArena Hard Prompts | 1397 | 1462 |
| DTBench | 90.7% | 96.5% |
| LMCA | 38.3% | 45.2% |
| Epoch Capabilities Index | 149.13 | 154.02 |
| ARC-AGI-2 | — | 52.6% |
| SimpleBench | — | 70% |
| Kagi LLM Benchmark | — | 83.5% |
| ARC-AGI-1 | — | 87.2% |
| Surface Evolver Bench | — | 74.4% |
| ForecastBench | 60.3 | — |

## Math

- Grok 4.3: 45.8 (#60)
- Grok 4.5: 60.7 (#29)

| Benchmark | Grok 4.3 | Grok 4.5 |
|---|---|---|
| FrontierMath (Tiers 1-3) | 42.8% | 57.2% |
| FrontierMath Tier 4 | 14.6% | 24.4% |
| OTIS Mock AIME 2024-2025 | 93.3% | 97.8% |
| ProofBench | 11% | 31% |
| LMArena Math | 1388 | 1457 |

## Knowledge

- Grok 4.3: 52.5 (#57)
- Grok 4.5: 62.3 (#21)

| Benchmark | Grok 4.3 | Grok 4.5 |
|---|---|---|
| GPQA Diamond | 88.8% | 93.4% |
| SimpleQA Verified | 33.2% | 48.3% |
| LMArena Expert | 1385 | 1466 |

## Multimodal

- Grok 4.3: 31.6 (#96)
- Grok 4.5: 37.8 (#63)

| Benchmark | Grok 4.3 | Grok 4.5 |
|---|---|---|
| LMArena Vision | 1231 | 1287 |
| Blueprint-Bench 2 | 0% | 27.3% |
| Furniture Assembly | — | 22.5% |
| LMArena Document | — | 1452 |

## Multilingual

- Grok 4.3: 50.7 (#114)
- Grok 4.5: 54.5 (#43)

| Benchmark | Grok 4.3 | Grok 4.5 |
|---|---|---|
| LMArena Non-English | 1385 | 1439 |
| LMArena Chinese | 1423 | 1497 |
| LMArena French | 1412 | 1458 |
| LMArena German | 1395 | 1448 |
| LMArena Japanese | 1379 | 1425 |
| LMArena Korean | 1357 | 1402 |
| LMArena Russian | 1399 | 1447 |
| LMArena Spanish | 1402 | 1452 |

## Instruction Following

- Grok 4.3: 72.3 (#135)
- Grok 4.5: 76.3 (#45)

| Benchmark | Grok 4.3 | Grok 4.5 |
|---|---|---|
| LMArena Instruction Following | 1366 | 1446 |

## Long Context

- Grok 4.3: 42.5 (#118)
- Grok 4.5: 44.8 (#54)

| Benchmark | Grok 4.3 | Grok 4.5 |
|---|---|---|
| LMArena Longer Query | 1393 | 1463 |

## Writing & Preference

- Grok 4.3: 58.6 (#112)
- Grok 4.5: 65.9 (#40)

| Benchmark | Grok 4.3 | Grok 4.5 |
|---|---|---|
| LMArena Text | 1397 | 1448 |
| LMArena Creative Writing | 1380 | 1442 |
| LMArena Multi-Turn | 1406 | 1457 |
| EQ-Bench Creative Writing | — | 1579 |
| EQ-Bench 4 | 1075 | — |

## FAQ

### Is Grok 4.3 better than Grok 4.5?

Grok 4.5 is the stronger model overall, scoring 55.0 to 43.6 on the Noometry Index. Grok 4.3 costs 1.9× less per token, which makes it the better buy when Grok 4.5's lead doesn't matter for your workload.

### Which is cheaper, Grok 4.3 or Grok 4.5?

Grok 4.3 is cheaper. It lists at $1.25 per million input tokens and $2.50 per million output tokens; Grok 4.5 lists at $2 and $6.

### Is Grok 4.3 or Grok 4.5 better for coding?

Grok 4.5 scores higher on coding benchmarks: 51.7 versus 41.3 in the Noometry coding category.

### Which has the bigger context window?

Grok 4.3 does, with 1M tokens against 500K.

### How many benchmarks do Grok 4.3 and Grok 4.5 share?

38 benchmarks have published results for both models. Grok 4.3 has 40 scored results on Noometry and Grok 4.5 has 52.