Model comparison
Claude Sonnet 4.5 vs Grok 4.5
Grok 4.5 is the stronger model overall, scoring 55.0 to 44.0 on the Noometry Index.
Last verified . 42 shared benchmarks.
Summary
- They share 42 benchmarks with published results for both. Claude Sonnet 4.5 scores higher in 2 categories and Grok 4.5 in 8 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.5 leads 56.0 to 26.9.
- The biggest single-benchmark swing is NYT Connections (extended): 37.3% for Claude Sonnet 4.5 and 79.9% for Grok 4.5.
- Grok 4.5 is cheaper at $2 / $6 per million input/output tokens, against $3 / $15 for Claude Sonnet 4.5.
- Claude Sonnet 4.5 accepts more context: 1M tokens versus 500K.
Side by side
| Claude Sonnet 4.5 | Grok 4.5 | |
|---|---|---|
| Provider | Anthropic | xAI |
| Noometry Index | 44.0 | 55.0 |
| Released | 2025-09-29 | 2026-07-08 |
| Weights | Proprietary | Proprietary |
| Context window | 1M | 500K |
| Max output | 64K | 500K |
| Input $ / M tokens | $3 | $2 |
| Output $ / M tokens | $15 | $6 |
| Results tracked | 73 | 52 |
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Category by category
Coding Grok 4.5 leads
Claude Sonnet 4.5: 47.8 (#54), Grok 4.5: 51.7 (#34)
| Benchmark | Claude Sonnet 4.5 | Grok 4.5 |
|---|---|---|
| LMArena WebDev | 1393 | 1552 |
| SciCode | 44.7% | 54.1% |
| WeirdML | 47.7% | 46.4% |
| LMArena Coding | 1489 | 1473 |
| ALE-Bench | 796.15 | 1,309 |
| SWE-bench Verified | 71.3% | — |
| DeepSWE | — | 53.8% |
| FrontierCode | — | 42.4% |
| SWE-bench Verified (bash only) | 71.4% | — |
| SWE-bench Multilingual | 67% | — |
| GSO | 14.7% | — |
| AlgoTune | 1.52 | — |
Agentic & Tool Use Grok 4.5 leads
Claude Sonnet 4.5: 38.1 (#30), Grok 4.5: 44.4 (#15)
| Benchmark | Claude Sonnet 4.5 | Grok 4.5 |
|---|---|---|
| τ²-bench Banking | 25.3% | 47.9% |
| LMArena Search | 1159 | 1213 |
| Vending-Bench 2 | 3,839 | 3,887 |
| Terminal-Bench | 46.5% | — |
| APEX-Agents | — | 56.2% |
| Berkeley Function Calling Leaderboard | 73.2% | — |
| GDPval | 42.5% | — |
| Remote Labor Index | 2.1% | — |
| τ²-bench Airline | 72% | — |
| τ²-bench Retail | 72.4% | — |
| τ²-bench Telecom | 84.9% | — |
| Cybench | 60% | — |
| DeepResearch Bench | 52.6% | — |
| OSWorld | 62.9% | — |
| PostTrainBench | — | 23.4% |
| GBAEval | — | 65.4% |
| GDP.pdf | — | 14% |
| METR Time Horizons | 67.4% | — |
Reasoning Grok 4.5 leads
Claude Sonnet 4.5: 26.9 (#113), Grok 4.5: 56.0 (#23)
| Benchmark | Claude Sonnet 4.5 | Grok 4.5 |
|---|---|---|
| ARC-AGI-2 | 13.6% | 52.6% |
| SimpleBench | 54.3% | 70% |
| Kagi LLM Benchmark | 57.9% | 83.5% |
| NYT Connections (extended) | 37.3% | 79.9% |
| ARC-AGI-1 | 63.7% | 87.2% |
| CritPt | 1.1% | 15.4% |
| Chess Puzzles | 12% | 36% |
| LMArena Hard Prompts | 1462 | 1462 |
| DTBench | 83.2% | 96.5% |
| LMCA | 38.8% | 45.2% |
| Epoch Capabilities Index | 146.84 | 154.02 |
| EnigmaEval | 6% | — |
| EBR-Bench | 2.4% | — |
| Mystery Game Puzzles | 17% | — |
| Surface Evolver Bench | — | 74.4% |
| ForecastBench | 61.9 | — |
Math Grok 4.5 leads
Claude Sonnet 4.5: 31.9 (#190), Grok 4.5: 60.7 (#29)
| Benchmark | Claude Sonnet 4.5 | Grok 4.5 |
|---|---|---|
| FrontierMath (Tiers 1-3) | 23.9% | 57.2% |
| FrontierMath Tier 4 | 2.4% | 24.4% |
| OTIS Mock AIME 2024-2025 | 77.8% | 97.8% |
| ProofBench | 19% | 31% |
| LMArena Math | 1448 | 1457 |
| Omni-MATH | 55.3% | — |
| MATH Level 5 | 97.7% | — |
| FrontierMath (Feb 2025 set) | 15.2% | — |
| FrontierMath Tier 4 (v1) | 4.2% | — |
Knowledge Grok 4.5 leads
Claude Sonnet 4.5: 48.4 (#70), Grok 4.5: 62.3 (#21)
| Benchmark | Claude Sonnet 4.5 | Grok 4.5 |
|---|---|---|
| GPQA Diamond | 82.3% | 93.4% |
| SimpleQA Verified | 30.7% | 48.3% |
| LMArena Expert | 1483 | 1466 |
| Humanity's Last Exam | 13.7% | — |
| MMLU-Pro | 86.9% | — |
| Vectara Hallucination Rate | 12% | — |
| GPQA (HELM) | 68.6% | — |
Multimodal Grok 4.5 leads
Claude Sonnet 4.5: 34.1 (#84), Grok 4.5: 37.8 (#63)
| Benchmark | Claude Sonnet 4.5 | Grok 4.5 |
|---|---|---|
| LMArena Document | 1450 | 1452 |
| LMArena Vision | — | 1287 |
| VPCT | 39.8% | — |
| Blueprint-Bench 2 | — | 27.3% |
| Furniture Assembly | — | 22.5% |
Multilingual Too close to call
Claude Sonnet 4.5: 53.6 (#65), Grok 4.5: 54.5 (#43)
| Benchmark | Claude Sonnet 4.5 | Grok 4.5 |
|---|---|---|
| LMArena Non-English | 1425 | 1439 |
| LMArena Chinese | 1459 | 1497 |
| LMArena French | 1459 | 1458 |
| LMArena German | 1427 | 1448 |
| LMArena Japanese | 1390 | 1425 |
| LMArena Korean | 1403 | 1402 |
| LMArena Russian | 1436 | 1447 |
| LMArena Spanish | 1457 | 1452 |
Instruction Following Grok 4.5 leads
Claude Sonnet 4.5: 75.2 (#74), Grok 4.5: 76.3 (#45)
| Benchmark | Claude Sonnet 4.5 | Grok 4.5 |
|---|---|---|
| LMArena Instruction Following | 1459 | 1446 |
| IFEval | 85% | — |
Long Context Too close to call
Claude Sonnet 4.5: 45.2 (#45), Grok 4.5: 44.8 (#54)
| Benchmark | Claude Sonnet 4.5 | Grok 4.5 |
|---|---|---|
| LMArena Longer Query | 1476 | 1463 |
Writing & Preference Too close to call
Claude Sonnet 4.5: 66.7 (#33), Grok 4.5: 65.9 (#40)
| Benchmark | Claude Sonnet 4.5 | Grok 4.5 |
|---|---|---|
| LMArena Text | 1439 | 1448 |
| LMArena Creative Writing | 1442 | 1442 |
| EQ-Bench Creative Writing | 1678 | 1579 |
| LMArena Multi-Turn | 1465 | 1457 |
| WildBench | 85.4% | — |
Frequently asked questions
Is Claude Sonnet 4.5 better than Grok 4.5?
Grok 4.5 is the stronger model overall, scoring 55.0 to 44.0 on the Noometry Index.
Which is cheaper, Claude Sonnet 4.5 or Grok 4.5?
Grok 4.5 is cheaper. It lists at $2 per million input tokens and $6 per million output tokens; Claude Sonnet 4.5 lists at $3 and $15.
Is Claude Sonnet 4.5 or Grok 4.5 better for coding?
Grok 4.5 scores higher on coding benchmarks: 51.7 versus 47.8 in the Noometry coding category.
Which has the bigger context window?
Claude Sonnet 4.5 does, with 1M tokens against 500K.
How many benchmarks do Claude Sonnet 4.5 and Grok 4.5 share?
42 benchmarks have published results for both models. Claude Sonnet 4.5 has 73 scored results on Noometry and Grok 4.5 has 52.