Model comparison
Claude Sonnet 5.5 vs Grok 4
Claude Sonnet 5.5 is the stronger model overall, scoring 61.9 to 48.1 on the Noometry Index.
Last verified . 16 shared benchmarks.
Summary
- They share 16 benchmarks with published results for both. Claude Sonnet 5.5 scores higher in 8 categories and Grok 4 in 2 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Sonnet 5.5 leads 87.9 to 48.4.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 100% for Claude Sonnet 5.5 and 84% for Grok 4.
Side by side
| Claude Sonnet 5.5 | Grok 4 | |
|---|---|---|
| Provider | Anthropic | xAI |
| Noometry Index | 61.9 | 48.1 |
| Released | 2026-09-28 | 2025-07-09 |
| Weights | Proprietary | Proprietary |
| Context window | 1M | — |
| Max output | 128K | — |
| Input $ / M tokens | $2 | — |
| Output $ / M tokens | $10 | — |
| Results tracked | 32 | 48 |
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Category by category
Coding Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 67.3 (#6), Grok 4: 50.3 (#46)
| Benchmark | Claude Sonnet 5.5 | Grok 4 |
|---|---|---|
| LMArena Coding | 1513 | 1408 |
| FrontierCode | 52.1% | — |
| Aider Polyglot | — | 79.6% |
| CursorBench | 55.5% | — |
| LMArena WebDev | 1774 | — |
| FrontierSWE | 61.9% | — |
| SciCode | 61% | — |
| WeirdML | — | 45.7% |
| ALE-Bench | 1,819 | — |
Agentic & Tool Use Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 45.0 (#16), Grok 4: 32.3 (#68)
| Benchmark | Claude Sonnet 5.5 | Grok 4 |
|---|---|---|
| Terminal-Bench | — | 27.2% |
| APEX-Agents | 75.5% | — |
| Berkeley Function Calling Leaderboard | — | 63% |
| GDPval | — | 21.1% |
| Cybench | — | 43% |
| DeepResearch Bench | — | 47.3% |
| BALROG | — | 43.6% |
| LMArena Search | — | 1142 |
| METR Time Horizons | — | 66.6% |
Reasoning Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 54.0 (#28), Grok 4: 36.7 (#65)
| Benchmark | Claude Sonnet 5.5 | Grok 4 |
|---|---|---|
| LMArena Hard Prompts | 1495 | 1409 |
| Epoch Capabilities Index | 165.03 | 146.44 |
| ARC-AGI-2 | — | 16% |
| SimpleBench | — | 60.5% |
| Kagi LLM Benchmark | — | 73.6% |
| NYT Connections (extended) | 80.5% | — |
| ARC-AGI-1 | — | 66.7% |
| CritPt | 31.4% | — |
| Chess Puzzles | — | 28% |
| Mystery Game Puzzles | 65% | — |
| ForecastBench | — | 60.9 |
Math Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 87.9 (#6), Grok 4: 48.4 (#64)
| Benchmark | Claude Sonnet 5.5 | Grok 4 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 100% | 84% |
| LMArena Math | 1510 | 1422 |
| FrontierMath (Tiers 1-3) | 88.8% | — |
| FrontierMath Tier 4 | 80.5% | — |
| ProofBench | 100% | — |
| Omni-MATH | — | 60.3% |
| FrontierMath (Feb 2025 set) | — | 19.7% |
| FrontierMath Erdős | 2.9% | — |
| FrontierMath Tier 4 (v1) | — | 2.1% |
Knowledge Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 66.0 (#12), Grok 4: 53.8 (#55)
| Benchmark | Claude Sonnet 5.5 | Grok 4 |
|---|---|---|
| GPQA Diamond | 95.6% | 87% |
| LMArena Expert | 1540 | 1415 |
| SimpleQA Verified | 46.5% | — |
| MMLU-Pro | — | 85.1% |
| Confabulations | — | 12.4% |
| GPQA (HELM) | — | 72.7% |
Multimodal Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 51.5 (#6), Grok 4: 33.7 (#94)
| Benchmark | Claude Sonnet 5.5 | Grok 4 |
|---|---|---|
| LMArena Vision | 1289 | 1210 |
| GeoBench | — | 45% |
| Furniture Assembly | 75% | — |
Multilingual Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 55.3 (#30), Grok 4: 51.8 (#103)
| Benchmark | Claude Sonnet 5.5 | Grok 4 |
|---|---|---|
| LMArena Non-English | 1452 | 1403 |
| LMArena Chinese | 1522 | 1427 |
| LMArena Russian | 1451 | 1410 |
| LMArena French | — | 1418 |
| LMArena German | — | 1429 |
| LMArena Japanese | — | 1394 |
| LMArena Korean | — | 1377 |
| LMArena Spanish | — | 1420 |
Instruction Following Too close to call
Claude Sonnet 5.5: 78.3 (#11), Grok 4: 79.2 (#5)
| Benchmark | Claude Sonnet 5.5 | Grok 4 |
|---|---|---|
| LMArena Instruction Following | 1495 | 1387 |
| IFEval | — | 94.9% |
Long Context Grok 4 leads
Claude Sonnet 5.5: 45.9 (#28), Grok 4: 63.1 (#4)
| Benchmark | Claude Sonnet 5.5 | Grok 4 |
|---|---|---|
| LMArena Longer Query | 1498 | 1409 |
| Fiction.LiveBench | — | 94.4% |
Writing & Preference Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 66.0 (#40), Grok 4: 58.5 (#116)
| Benchmark | Claude Sonnet 5.5 | Grok 4 |
|---|---|---|
| LMArena Text | 1471 | 1411 |
| LMArena Creative Writing | 1465 | 1397 |
| LMArena Multi-Turn | 1474 | 1416 |
| Short-Story Creative Writing | — | 76.9% |
| WildBench | — | 79.7% |
Frequently asked questions
Is Claude Sonnet 5.5 better than Grok 4?
Claude Sonnet 5.5 is the stronger model overall, scoring 61.9 to 48.1 on the Noometry Index.
Is Claude Sonnet 5.5 or Grok 4 better for coding?
Claude Sonnet 5.5 scores higher on coding benchmarks: 67.3 versus 50.3 in the Noometry coding category.
How many benchmarks do Claude Sonnet 5.5 and Grok 4 share?
16 benchmarks have published results for both models. Claude Sonnet 5.5 has 32 scored results on Noometry and Grok 4 has 48.