Model comparison
Claude Sonnet 5 vs Grok 4.5
Claude Sonnet 5 and Grok 4.5 score almost the same on the Noometry Index (54.6 vs 55.0), so choose on price, context window or the category you care about most.
Last verified . 45 shared benchmarks.
Summary
- They share 45 benchmarks with published results for both. Claude Sonnet 5 scores higher in 6 categories and Grok 4.5 in 4 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.5 leads 56.1 to 49.1.
- The biggest single-benchmark swing is ProofBench: 77% for Claude Sonnet 5 and 31% for Grok 4.5.
- Grok 4.5 is cheaper at $2 / $6 per million input/output tokens, against $2 / $10 for Claude Sonnet 5.
- Claude Sonnet 5 accepts more context: 1M tokens versus 500K.
Side by side
| Claude Sonnet 5 | Grok 4.5 | |
|---|---|---|
| Provider | Anthropic | xAI |
| Noometry Index | 54.6 | 55.0 |
| Released | 2026-06-29 | 2026-07-08 |
| Weights | Proprietary | Proprietary |
| Context window | 1M | 500K |
| Max output | 128K | 500K |
| Input $ / M tokens | $2 | $2 |
| Output $ / M tokens | $10 | $6 |
| Results tracked | 51 | 52 |
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Category by category
Coding Claude Sonnet 5 leads
Claude Sonnet 5: 55.5 (#26), Grok 4.5: 52.2 (#35)
| Benchmark | Claude Sonnet 5 | Grok 4.5 |
|---|---|---|
| DeepSWE | 53.8% | 53.8% |
| FrontierCode | 42.7% | 42.4% |
| LMArena WebDev | 1541 | 1553 |
| SciCode | 54.3% | 54.1% |
| WeirdML | 68.8% | 46.4% |
| LMArena Coding | 1483 | 1474 |
| ALE-Bench | 1,463 | 1,309 |
| CursorBench | 34.1% | — |
| GSO | 37.3% | — |
Agentic & Tool Use Grok 4.5 leads
Claude Sonnet 5: 42.8 (#18), Grok 4.5: 44.4 (#17)
| Benchmark | Claude Sonnet 5 | Grok 4.5 |
|---|---|---|
| APEX-Agents | 54.5% | 56.2% |
| GBAEval | 65.3% | 65.4% |
| LMArena Search | 1194 | 1213 |
| Vending-Bench 2 | 6,378 | 3,887 |
| τ²-bench Banking | — | 47.9% |
| PostTrainBench | — | 23.4% |
| GDP.pdf | — | 14% |
Reasoning Grok 4.5 leads
Claude Sonnet 5: 49.1 (#39), Grok 4.5: 56.1 (#25)
| Benchmark | Claude Sonnet 5 | Grok 4.5 |
|---|---|---|
| SimpleBench | 60.6% | 70% |
| NYT Connections (extended) | 75.1% | 79.9% |
| CritPt | 16.9% | 15.4% |
| Chess Puzzles | 35% | 36% |
| LMArena Hard Prompts | 1461 | 1462 |
| DTBench | 92.5% | 96.5% |
| LMCA | 50% | 45.2% |
| Surface Evolver Bench | 60% | 74.4% |
| Epoch Capabilities Index | 156.21 | 153.92 |
| ARC-AGI-2 | — | 52.6% |
| Kagi LLM Benchmark | — | 83.5% |
| ARC-AGI-1 | — | 87.2% |
| Mystery Game Puzzles | 35% | — |
| Bench to the Future 3 | 0.14 | — |
| ForecastBench | 61.1 | — |
Math Claude Sonnet 5 leads
Claude Sonnet 5: 66.2 (#27), Grok 4.5: 60.9 (#35)
| Benchmark | Claude Sonnet 5 | Grok 4.5 |
|---|---|---|
| FrontierMath (Tiers 1-3) | 65.6% | 57.2% |
| FrontierMath Tier 4 | 29.3% | 24.4% |
| OTIS Mock AIME 2024-2025 | 94.7% | 97.8% |
| ProofBench | 77% | 31% |
| LMArena Math | 1467 | 1459 |
Knowledge Grok 4.5 leads
Claude Sonnet 5: 55.6 (#47), Grok 4.5: 62.3 (#24)
| Benchmark | Claude Sonnet 5 | Grok 4.5 |
|---|---|---|
| GPQA Diamond | 90.5% | 93.4% |
| SimpleQA Verified | 33.7% | 48.3% |
| LMArena Expert | 1490 | 1466 |
Multimodal Claude Sonnet 5 leads
Claude Sonnet 5: 42.4 (#31), Grok 4.5: 37.6 (#72)
| Benchmark | Claude Sonnet 5 | Grok 4.5 |
|---|---|---|
| LMArena Vision | 1274 | 1288 |
| Blueprint-Bench 2 | 24.9% | 27.3% |
| LMArena Document | 1466 | 1452 |
| Furniture Assembly | — | 22.5% |
Multilingual Too close to call
Claude Sonnet 5: 53.8 (#55), Grok 4.5: 54.4 (#42)
| Benchmark | Claude Sonnet 5 | Grok 4.5 |
|---|---|---|
| LMArena Non-English | 1431 | 1440 |
| LMArena Chinese | 1477 | 1496 |
| LMArena French | 1460 | 1456 |
| LMArena German | 1440 | 1446 |
| LMArena Japanese | 1422 | 1428 |
| LMArena Korean | 1411 | 1404 |
| LMArena Russian | 1451 | 1448 |
| LMArena Spanish | 1437 | 1450 |
Instruction Following Too close to call
Claude Sonnet 5: 76.3 (#41), Grok 4.5: 76.0 (#48)
| Benchmark | Claude Sonnet 5 | Grok 4.5 |
|---|---|---|
| LMArena Instruction Following | 1452 | 1446 |
Long Context Too close to call
Claude Sonnet 5: 44.8 (#55), Grok 4.5: 44.8 (#56)
| Benchmark | Claude Sonnet 5 | Grok 4.5 |
|---|---|---|
| LMArena Longer Query | 1463 | 1463 |
Writing & Preference Claude Sonnet 5 leads
Claude Sonnet 5: 69.2 (#25), Grok 4.5: 65.8 (#42)
| Benchmark | Claude Sonnet 5 | Grok 4.5 |
|---|---|---|
| LMArena Text | 1442 | 1448 |
| LMArena Creative Writing | 1416 | 1442 |
| EQ-Bench Creative Writing | 1794 | 1579 |
| LMArena Multi-Turn | 1454 | 1456 |
| EQ-Bench 4 | 1236 | — |
Frequently asked questions
Is Claude Sonnet 5 better than Grok 4.5?
Claude Sonnet 5 and Grok 4.5 score almost the same on the Noometry Index (54.6 vs 55.0), so choose on price, context window or the category you care about most.
Which is cheaper, Claude Sonnet 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 5 lists at $2 and $10.
Is Claude Sonnet 5 or Grok 4.5 better for coding?
Claude Sonnet 5 scores higher on coding benchmarks: 55.5 versus 52.2 in the Noometry coding category.
Which has the bigger context window?
Claude Sonnet 5 does, with 1M tokens against 500K.
How many benchmarks do Claude Sonnet 5 and Grok 4.5 share?
45 benchmarks have published results for both models. Claude Sonnet 5 has 51 scored results on Noometry and Grok 4.5 has 52.