Model comparison
Claude 2.1 vs Grok 4.3
Grok 4.3 is the stronger model overall, scoring 43.8 to 25.2 on the Noometry Index.
Last verified . 6 shared benchmarks.
Summary
- They share 6 benchmarks with published results for both. Claude 2.1 scores higher in 0 categories and Grok 4.3 in 4 categories; 4 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Grok 4.3 leads 52.5 to 15.4.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 1.9% for Claude 2.1 and 93.3% for Grok 4.3.
Side by side
| Claude 2.1 | Grok 4.3 | |
|---|---|---|
| Provider | Anthropic | xAI |
| Noometry Index | 25.2 | 43.8 |
| Released | 2023-11-21 | 2026-04-17 |
| Weights | Proprietary | Proprietary |
| Context window | — | 1M |
| Max output | — | 30K |
| Input $ / M tokens | — | $1.25 |
| Output $ / M tokens | — | $2.50 |
| Results tracked | 7 | 40 |
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Category by category
Coding Grok 4.3 leads
Claude 2.1: 26.2 (#327), Grok 4.3: 41.6 (#121)
| Benchmark | Claude 2.1 | Grok 4.3 |
|---|---|---|
| WeirdML | 7.1% | 49.9% |
| LMArena WebDev | — | 1357 |
| SciCode | — | 47.3% |
| LMArena Coding | — | 1415 |
| ALE-Bench | — | 944.17 |
Agentic & Tool Use Not comparable
Claude 2.1: —, Grok 4.3: 27.7 (#99)
| Benchmark | Claude 2.1 | Grok 4.3 |
|---|---|---|
| GDP.pdf | — | 8% |
| LMArena Search | — | 1165 |
| Vending-Bench 2 | — | 35.26 |
Reasoning Grok 4.3 leads
Claude 2.1: 21.4 (#221), Grok 4.3: 35.9 (#68)
| Benchmark | Claude 2.1 | Grok 4.3 |
|---|---|---|
| DTBench | 51% | 90.7% |
| Epoch Capabilities Index | 119.27 | 149.16 |
| ForecastBench | 54.2 | 60.3 |
| NYT Connections (extended) | — | 55.2% |
| CritPt | — | 8% |
| Chess Puzzles | — | 25% |
| LMArena Hard Prompts | — | 1396 |
| LMCA | — | 38.3% |
Math Grok 4.3 leads
Claude 2.1: 10.2 (#315), Grok 4.3: 46.0 (#74)
| Benchmark | Claude 2.1 | Grok 4.3 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 1.9% | 93.3% |
| FrontierMath (Tiers 1-3) | — | 42.8% |
| FrontierMath Tier 4 | — | 14.6% |
| ProofBench | — | 11% |
| LMArena Math | — | 1388 |
Knowledge Grok 4.3 leads
Claude 2.1: 15.4 (#292), Grok 4.3: 52.5 (#62)
| Benchmark | Claude 2.1 | Grok 4.3 |
|---|---|---|
| GPQA Diamond | 33% | 88.8% |
| SimpleQA Verified | — | 33.2% |
| LMArena Expert | — | 1385 |
| MMLU | 73.5% | — |
Multimodal Not comparable
Claude 2.1: —, Grok 4.3: 31.6 (#104)
| Benchmark | Claude 2.1 | Grok 4.3 |
|---|---|---|
| LMArena Vision | — | 1229 |
| Blueprint-Bench 2 | — | 0% |
Multilingual Not comparable
Claude 2.1: —, Grok 4.3: 50.5 (#120)
| Benchmark | Claude 2.1 | Grok 4.3 |
|---|---|---|
| LMArena Non-English | — | 1385 |
| LMArena Chinese | — | 1422 |
| LMArena French | — | 1412 |
| LMArena German | — | 1395 |
| LMArena Japanese | — | 1379 |
| LMArena Korean | — | 1356 |
| LMArena Russian | — | 1399 |
| LMArena Spanish | — | 1398 |
Instruction Following Not comparable
Claude 2.1: —, Grok 4.3: 72.1 (#140)
| Benchmark | Claude 2.1 | Grok 4.3 |
|---|---|---|
| LMArena Instruction Following | — | 1366 |
Long Context Not comparable
Claude 2.1: —, Grok 4.3: 42.5 (#123)
| Benchmark | Claude 2.1 | Grok 4.3 |
|---|---|---|
| LMArena Longer Query | — | 1393 |
Writing & Preference Not comparable
Claude 2.1: —, Grok 4.3: 58.5 (#118)
| Benchmark | Claude 2.1 | Grok 4.3 |
|---|---|---|
| LMArena Text | — | 1397 |
| LMArena Creative Writing | — | 1380 |
| EQ-Bench 4 | — | 1075 |
| LMArena Multi-Turn | — | 1406 |
Frequently asked questions
Is Claude 2.1 better than Grok 4.3?
Grok 4.3 is the stronger model overall, scoring 43.8 to 25.2 on the Noometry Index.
Is Claude 2.1 or Grok 4.3 better for coding?
Grok 4.3 scores higher on coding benchmarks: 41.6 versus 26.2 in the Noometry coding category.
How many benchmarks do Claude 2.1 and Grok 4.3 share?
6 benchmarks have published results for both models. Claude 2.1 has 7 scored results on Noometry and Grok 4.3 has 40.