Model comparison
Claude Sonnet 5.5 vs Grok-2 (Dec 2024)
Claude Sonnet 5.5 is the stronger model overall, scoring 61.9 to 33.7 on the Noometry Index.
Last verified . 15 shared benchmarks.
Summary
- They share 15 benchmarks with published results for both. Claude Sonnet 5.5 scores higher in 8 categories and Grok-2 (Dec 2024) in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Sonnet 5.5 leads 87.9 to 20.8.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 100% for Claude Sonnet 5.5 and 11.5% for Grok-2 (Dec 2024).
Side by side
| Claude Sonnet 5.5 | Grok-2 (Dec 2024) | |
|---|---|---|
| Provider | Anthropic | xAI |
| Noometry Index | 61.9 | 33.7 |
| Released | 2026-09-28 | 2024-08-13 |
| Weights | Proprietary | Proprietary |
| Context window | 1M | — |
| Max output | 128K | — |
| Input $ / M tokens | $2 | — |
| Output $ / M tokens | $10 | — |
| Results tracked | 32 | 34 |
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Category by category
Coding Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 67.3 (#6), Grok-2 (Dec 2024): 33.3 (#258)
| Benchmark | Claude Sonnet 5.5 | Grok-2 (Dec 2024) |
|---|---|---|
| LMArena Coding | 1513 | 1287 |
| FrontierCode | 52.1% | — |
| CursorBench | 55.5% | — |
| LMArena WebDev | 1774 | — |
| FrontierSWE | 61.9% | — |
| SciCode | 61% | — |
| WeirdML | — | 22.2% |
| LiveBench Coding | — | 46.4% |
| ALE-Bench | 1,819 | — |
Agentic & Tool Use Not comparable
Claude Sonnet 5.5: 45.0 (#16), Grok-2 (Dec 2024): —
| Benchmark | Claude Sonnet 5.5 | Grok-2 (Dec 2024) |
|---|---|---|
| APEX-Agents | 75.5% | — |
Reasoning Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 54.0 (#28), Grok-2 (Dec 2024): 16.9 (#299)
| Benchmark | Claude Sonnet 5.5 | Grok-2 (Dec 2024) |
|---|---|---|
| LMArena Hard Prompts | 1495 | 1272 |
| Epoch Capabilities Index | 165.03 | 130.48 |
| SimpleBench | — | 22.7% |
| NYT Connections (extended) | 80.5% | — |
| CritPt | 31.4% | — |
| LiveBench Reasoning | — | 54.8% |
| Mystery Game Puzzles | 65% | — |
| DTBench | — | 65.2% |
| LiveBench Data Analysis | — | 54.5% |
| LiveBench | — | 54.3% |
Math Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 87.9 (#6), Grok-2 (Dec 2024): 20.8 (#284)
| Benchmark | Claude Sonnet 5.5 | Grok-2 (Dec 2024) |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 100% | 11.5% |
| LMArena Math | 1510 | 1283 |
| FrontierMath (Tiers 1-3) | 88.8% | — |
| FrontierMath Tier 4 | 80.5% | — |
| ProofBench | 100% | — |
| LiveBench Math | — | 54.9% |
| MATH Level 5 | — | 63.5% |
| FrontierMath (Feb 2025 set) | — | 0.7% |
| FrontierMath Erdős | 2.9% | — |
Knowledge Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 66.0 (#12), Grok-2 (Dec 2024): 29.8 (#233)
| Benchmark | Claude Sonnet 5.5 | Grok-2 (Dec 2024) |
|---|---|---|
| GPQA Diamond | 95.6% | 53.8% |
| LMArena Expert | 1540 | 1254 |
| SimpleQA Verified | 46.5% | — |
| Confabulations | — | 20.1% |
Multimodal Not comparable
Claude Sonnet 5.5: 51.5 (#6), Grok-2 (Dec 2024): —
| Benchmark | Claude Sonnet 5.5 | Grok-2 (Dec 2024) |
|---|---|---|
| LMArena Vision | 1289 | — |
| Furniture Assembly | 75% | — |
Multilingual Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 55.3 (#30), Grok-2 (Dec 2024): 43.1 (#188)
| Benchmark | Claude Sonnet 5.5 | Grok-2 (Dec 2024) |
|---|---|---|
| LMArena Non-English | 1452 | 1282 |
| LMArena Chinese | 1522 | 1289 |
| LMArena Russian | 1451 | 1286 |
| LMArena French | — | 1318 |
| LMArena German | — | 1287 |
| LMArena Japanese | — | 1244 |
| LMArena Korean | — | 1237 |
| LMArena Spanish | — | 1281 |
Instruction Following Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 78.3 (#11), Grok-2 (Dec 2024): 66.9 (#202)
| Benchmark | Claude Sonnet 5.5 | Grok-2 (Dec 2024) |
|---|---|---|
| LMArena Instruction Following | 1495 | 1270 |
| LiveBench Instruction Following | — | 69.6% |
Long Context Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 45.9 (#28), Grok-2 (Dec 2024): 38.8 (#190)
| Benchmark | Claude Sonnet 5.5 | Grok-2 (Dec 2024) |
|---|---|---|
| LMArena Longer Query | 1498 | 1276 |
Writing & Preference Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 66.0 (#40), Grok-2 (Dec 2024): 48.6 (#198)
| Benchmark | Claude Sonnet 5.5 | Grok-2 (Dec 2024) |
|---|---|---|
| LMArena Text | 1471 | 1305 |
| LMArena Creative Writing | 1465 | 1284 |
| LMArena Multi-Turn | 1474 | 1290 |
| Short-Story Creative Writing | — | 63.6% |
| LiveBench Language | — | 45.6% |
Frequently asked questions
Is Claude Sonnet 5.5 better than Grok-2 (Dec 2024)?
Claude Sonnet 5.5 is the stronger model overall, scoring 61.9 to 33.7 on the Noometry Index.
Is Claude Sonnet 5.5 or Grok-2 (Dec 2024) better for coding?
Claude Sonnet 5.5 scores higher on coding benchmarks: 67.3 versus 33.3 in the Noometry coding category.
How many benchmarks do Claude Sonnet 5.5 and Grok-2 (Dec 2024) share?
15 benchmarks have published results for both models. Claude Sonnet 5.5 has 32 scored results on Noometry and Grok-2 (Dec 2024) has 34.