Model comparison
Grok 4.3 vs Mercury
Grok 4.3 is the stronger model overall, scoring 43.8 to 37.6 on the Noometry Index.
Last verified . 8 shared benchmarks.
Summary
- They share 8 benchmarks with published results for both. Grok 4.3 scores higher in 6 categories and Mercury in 0 categories; 6 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.3 leads 35.9 to 17.5.
Side by side
| Grok 4.3 | Mercury | |
|---|---|---|
| Provider | xAI | Inception |
| Noometry Index | 43.8 | 37.6 |
| Released | 2026-04-17 | — |
| Weights | Proprietary | Proprietary |
| Context window | 1M | — |
| Max output | 30K | — |
| Input $ / M tokens | $1.25 | — |
| Output $ / M tokens | $2.50 | — |
| Results tracked | 40 | 9 |
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Category by category
Coding Grok 4.3 leads
Grok 4.3: 41.6 (#121), Mercury: 38.7 (#170)
| Benchmark | Grok 4.3 | Mercury |
|---|---|---|
| LMArena Coding | 1415 | 1322 |
| LMArena WebDev | 1357 | — |
| SciCode | 47.3% | — |
| WeirdML | 49.9% | — |
| ALE-Bench | 944.17 | — |
Agentic & Tool Use Not comparable
Grok 4.3: 27.7 (#99), Mercury: —
| Benchmark | Grok 4.3 | Mercury |
|---|---|---|
| GDP.pdf | 8% | — |
| LMArena Search | 1165 | — |
| Vending-Bench 2 | 35.26 | — |
Reasoning Grok 4.3 leads
Grok 4.3: 35.9 (#68), Mercury: 17.5 (#293)
| Benchmark | Grok 4.3 | Mercury |
|---|---|---|
| LMArena Hard Prompts | 1396 | 1285 |
| Kagi LLM Benchmark | — | 21.6% |
| NYT Connections (extended) | 55.2% | — |
| CritPt | 8% | — |
| Chess Puzzles | 25% | — |
| DTBench | 90.7% | — |
| LMCA | 38.3% | — |
| Epoch Capabilities Index | 149.16 | — |
| ForecastBench | 60.3 | — |
Math Not comparable
Grok 4.3: 46.0 (#74), Mercury: —
| Benchmark | Grok 4.3 | Mercury |
|---|---|---|
| FrontierMath (Tiers 1-3) | 42.8% | — |
| FrontierMath Tier 4 | 14.6% | — |
| OTIS Mock AIME 2024-2025 | 93.3% | — |
| ProofBench | 11% | — |
| LMArena Math | 1388 | — |
Knowledge Not comparable
Grok 4.3: 52.5 (#62), Mercury: —
| Benchmark | Grok 4.3 | Mercury |
|---|---|---|
| GPQA Diamond | 88.8% | — |
| SimpleQA Verified | 33.2% | — |
| LMArena Expert | 1385 | — |
Multimodal Not comparable
Grok 4.3: 31.6 (#104), Mercury: —
| Benchmark | Grok 4.3 | Mercury |
|---|---|---|
| LMArena Vision | 1229 | — |
| Blueprint-Bench 2 | 0% | — |
Multilingual Grok 4.3 leads
Grok 4.3: 50.5 (#120), Mercury: 41.6 (#206)
| Benchmark | Grok 4.3 | Mercury |
|---|---|---|
| LMArena Non-English | 1385 | 1260 |
| LMArena Chinese | 1422 | — |
| LMArena French | 1412 | — |
| LMArena German | 1395 | — |
| LMArena Japanese | 1379 | — |
| LMArena Korean | 1356 | — |
| LMArena Russian | 1399 | — |
| LMArena Spanish | 1398 | — |
Instruction Following Grok 4.3 leads
Grok 4.3: 72.1 (#140), Mercury: 65.2 (#224)
| Benchmark | Grok 4.3 | Mercury |
|---|---|---|
| LMArena Instruction Following | 1366 | 1239 |
Long Context Grok 4.3 leads
Grok 4.3: 42.5 (#123), Mercury: 38.4 (#198)
| Benchmark | Grok 4.3 | Mercury |
|---|---|---|
| LMArena Longer Query | 1393 | 1266 |
Writing & Preference Grok 4.3 leads
Grok 4.3: 58.5 (#118), Mercury: 46.2 (#221)
| Benchmark | Grok 4.3 | Mercury |
|---|---|---|
| LMArena Text | 1397 | 1282 |
| LMArena Creative Writing | 1380 | 1191 |
| LMArena Multi-Turn | 1406 | 1282 |
| EQ-Bench 4 | 1075 | — |
Frequently asked questions
Is Grok 4.3 better than Mercury?
Grok 4.3 is the stronger model overall, scoring 43.8 to 37.6 on the Noometry Index.
Is Grok 4.3 or Mercury better for coding?
Grok 4.3 scores higher on coding benchmarks: 41.6 versus 38.7 in the Noometry coding category.
How many benchmarks do Grok 4.3 and Mercury share?
8 benchmarks have published results for both models. Grok 4.3 has 40 scored results on Noometry and Mercury has 9.