Model comparison
Grok 4.3 vs Grok 4.5
Grok 4.5 is the stronger model overall, scoring 55.0 to 43.8 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.
Last verified . 38 shared benchmarks.
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 56.1 to 35.9.
- 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.
Side by side
| Grok 4.3 | Grok 4.5 | |
|---|---|---|
| Provider | xAI | xAI |
| Noometry Index | 43.8 | 55.0 |
| Released | 2026-04-17 | 2026-07-08 |
| Weights | Proprietary | Proprietary |
| Context window | 1M | 500K |
| Max output | 30K | 500K |
| Input $ / M tokens | $1.25 | $2 |
| Output $ / M tokens | $2.50 | $6 |
| Results tracked | 40 | 52 |
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Category by category
Coding Grok 4.5 leads
Grok 4.3: 41.6 (#121), Grok 4.5: 52.2 (#35)
| Benchmark | Grok 4.3 | Grok 4.5 |
|---|---|---|
| LMArena WebDev | 1357 | 1553 |
| SciCode | 47.3% | 54.1% |
| WeirdML | 49.9% | 46.4% |
| LMArena Coding | 1415 | 1474 |
| ALE-Bench | 944.17 | 1,309 |
| DeepSWE | — | 53.8% |
| FrontierCode | — | 42.4% |
Agentic & Tool Use Grok 4.5 leads
Grok 4.3: 27.7 (#99), Grok 4.5: 44.4 (#17)
| 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 4.5 leads
Grok 4.3: 35.9 (#68), Grok 4.5: 56.1 (#25)
| 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 | 1396 | 1462 |
| DTBench | 90.7% | 96.5% |
| LMCA | 38.3% | 45.2% |
| Epoch Capabilities Index | 149.16 | 153.92 |
| 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 4.5 leads
Grok 4.3: 46.0 (#74), Grok 4.5: 60.9 (#35)
| 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 | 1459 |
Knowledge Grok 4.5 leads
Grok 4.3: 52.5 (#62), Grok 4.5: 62.3 (#24)
| 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 4.5 leads
Grok 4.3: 31.6 (#104), Grok 4.5: 37.6 (#72)
| Benchmark | Grok 4.3 | Grok 4.5 |
|---|---|---|
| LMArena Vision | 1229 | 1288 |
| Blueprint-Bench 2 | 0% | 27.3% |
| Furniture Assembly | — | 22.5% |
| LMArena Document | — | 1452 |
Multilingual Grok 4.5 leads
Grok 4.3: 50.5 (#120), Grok 4.5: 54.4 (#42)
| Benchmark | Grok 4.3 | Grok 4.5 |
|---|---|---|
| LMArena Non-English | 1385 | 1440 |
| LMArena Chinese | 1422 | 1496 |
| LMArena French | 1412 | 1456 |
| LMArena German | 1395 | 1446 |
| LMArena Japanese | 1379 | 1428 |
| LMArena Korean | 1356 | 1404 |
| LMArena Russian | 1399 | 1448 |
| LMArena Spanish | 1398 | 1450 |
Instruction Following Grok 4.5 leads
Grok 4.3: 72.1 (#140), Grok 4.5: 76.0 (#48)
| Benchmark | Grok 4.3 | Grok 4.5 |
|---|---|---|
| LMArena Instruction Following | 1366 | 1446 |
Long Context Grok 4.5 leads
Grok 4.3: 42.5 (#123), Grok 4.5: 44.8 (#56)
| Benchmark | Grok 4.3 | Grok 4.5 |
|---|---|---|
| LMArena Longer Query | 1393 | 1463 |
Writing & Preference Grok 4.5 leads
Grok 4.3: 58.5 (#118), Grok 4.5: 65.8 (#42)
| Benchmark | Grok 4.3 | Grok 4.5 |
|---|---|---|
| LMArena Text | 1397 | 1448 |
| LMArena Creative Writing | 1380 | 1442 |
| LMArena Multi-Turn | 1406 | 1456 |
| EQ-Bench Creative Writing | — | 1579 |
| EQ-Bench 4 | 1075 | — |
Frequently asked questions
Is Grok 4.3 better than Grok 4.5?
Grok 4.5 is the stronger model overall, scoring 55.0 to 43.8 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: 52.2 versus 41.6 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.