# Claude Sonnet 4.5 vs Claude Sonnet 5

> Claude Sonnet 5 is the stronger model overall, scoring 54.6 to 44.1 on the Noometry Index.

- Canonical page: https://noometry.com/compare/claude-sonnet-4-5-vs-claude-sonnet-5
- Last updated: 2026-10-12
- Shared benchmarks: 41

## Summary

- They share 41 benchmarks with published results for both. Claude Sonnet 4.5 scores higher in 1 category and Claude Sonnet 5 in 9 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Sonnet 5 leads 66.2 to 32.3.
- The biggest single-benchmark swing is ProofBench: 19% for Claude Sonnet 4.5 and 77% for Claude Sonnet 5.
- Claude Sonnet 5 is cheaper at $2 / $10 per million input/output tokens, against $3 / $15 for Claude Sonnet 4.5.
- Claude Sonnet 5 accepts more context: 1M tokens versus 200K.

## Snapshot

| | Claude Sonnet 4.5 | Claude Sonnet 5 |
|---|---|---|
| Provider | Anthropic | Anthropic |
| Noometry Index | 44.1 | 54.6 |
| Rank | 81 | 29 |
| Context | 200K | 1M |
| Input $/M | $3 | $2 |
| Output $/M | $15 | $10 |
| Weights | Proprietary | Proprietary |

## Coding

- Claude Sonnet 4.5: 47.3 (#61)
- Claude Sonnet 5: 55.5 (#26)

| Benchmark | Claude Sonnet 4.5 | Claude Sonnet 5 |
|---|---|---|
| LMArena WebDev | 1393 | 1541 |
| SciCode | 44.7% | 54.3% |
| GSO | 14.7% | 37.3% |
| WeirdML | 47.7% | 68.8% |
| LMArena Coding | 1489 | 1483 |
| ALE-Bench | 796.15 | 1,463 |
| SWE-bench Verified | 71.3% | — |
| DeepSWE | — | 53.8% |
| FrontierCode | — | 42.7% |
| SWE-bench Verified (bash only) | 71.4% | — |
| CursorBench | — | 34.1% |
| SWE-bench Multilingual | 67% | — |
| AlgoTune | 1.52 | — |

## Agentic & Tool Use

- Claude Sonnet 4.5: 38.3 (#32)
- Claude Sonnet 5: 42.8 (#18)

| Benchmark | Claude Sonnet 4.5 | Claude Sonnet 5 |
|---|---|---|
| LMArena Search | 1159 | 1194 |
| Vending-Bench 2 | 3,839 | 6,378 |
| Terminal-Bench | 46.5% | — |
| APEX-Agents | — | 54.5% |
| Berkeley Function Calling Leaderboard | 73.2% | — |
| GDPval | 42.5% | — |
| Remote Labor Index | 2.1% | — |
| τ²-bench Airline | 72% | — |
| τ²-bench Banking | 25.3% | — |
| τ²-bench Retail | 72.4% | — |
| τ²-bench Telecom | 84.9% | — |
| Cybench | 60% | — |
| DeepResearch Bench | 52.6% | — |
| OSWorld | 62.9% | — |
| GBAEval | — | 65.3% |
| METR Time Horizons | 67.4% | — |

## Reasoning

- Claude Sonnet 4.5: 26.9 (#125)
- Claude Sonnet 5: 49.1 (#39)

| Benchmark | Claude Sonnet 4.5 | Claude Sonnet 5 |
|---|---|---|
| SimpleBench | 54.3% | 60.6% |
| NYT Connections (extended) | 37.3% | 75.1% |
| CritPt | 1.1% | 16.9% |
| Chess Puzzles | 12% | 35% |
| LMArena Hard Prompts | 1462 | 1461 |
| Mystery Game Puzzles | 17% | 35% |
| DTBench | 83.2% | 92.5% |
| LMCA | 38.8% | 50% |
| Epoch Capabilities Index | 146.84 | 156.21 |
| ForecastBench | 61.9 | 61.1 |
| ARC-AGI-2 | 13.6% | — |
| Kagi LLM Benchmark | 57.9% | — |
| ARC-AGI-1 | 63.7% | — |
| EnigmaEval | 6% | — |
| EBR-Bench | 2.4% | — |
| Surface Evolver Bench | — | 60% |
| Bench to the Future 3 | — | 0.14 |

## Math

- Claude Sonnet 4.5: 32.3 (#216)
- Claude Sonnet 5: 66.2 (#27)

| Benchmark | Claude Sonnet 4.5 | Claude Sonnet 5 |
|---|---|---|
| FrontierMath (Tiers 1-3) | 23.9% | 65.6% |
| FrontierMath Tier 4 | 2.4% | 29.3% |
| OTIS Mock AIME 2024-2025 | 77.8% | 94.7% |
| ProofBench | 19% | 77% |
| LMArena Math | 1449 | 1467 |
| Omni-MATH | 55.3% | — |
| MATH Level 5 | 97.7% | — |
| FrontierMath (Feb 2025 set) | 15.2% | — |
| FrontierMath Tier 4 (v1) | 4.2% | — |

## Knowledge

- Claude Sonnet 4.5: 48.4 (#76)
- Claude Sonnet 5: 55.6 (#47)

| Benchmark | Claude Sonnet 4.5 | Claude Sonnet 5 |
|---|---|---|
| GPQA Diamond | 82.3% | 90.5% |
| SimpleQA Verified | 30.7% | 33.7% |
| LMArena Expert | 1482 | 1490 |
| Humanity's Last Exam | 13.7% | — |
| MMLU-Pro | 86.9% | — |
| Vectara Hallucination Rate | 12% | — |
| GPQA (HELM) | 68.6% | — |

## Multimodal

- Claude Sonnet 4.5: 34.8 (#89)
- Claude Sonnet 5: 42.4 (#31)

| Benchmark | Claude Sonnet 4.5 | Claude Sonnet 5 |
|---|---|---|
| LMArena Document | 1450 | 1466 |
| LMArena Vision | — | 1274 |
| VPCT | 39.8% | — |
| Blueprint-Bench 2 | — | 24.9% |

## Multilingual

- Claude Sonnet 4.5: 53.4 (#69)
- Claude Sonnet 5: 53.8 (#55)

| Benchmark | Claude Sonnet 4.5 | Claude Sonnet 5 |
|---|---|---|
| LMArena Non-English | 1425 | 1431 |
| LMArena Chinese | 1459 | 1477 |
| LMArena French | 1458 | 1460 |
| LMArena German | 1427 | 1440 |
| LMArena Japanese | 1390 | 1422 |
| LMArena Korean | 1403 | 1411 |
| LMArena Russian | 1437 | 1451 |
| LMArena Spanish | 1457 | 1437 |

## Instruction Following

- Claude Sonnet 4.5: 75.0 (#78)
- Claude Sonnet 5: 76.3 (#41)

| Benchmark | Claude Sonnet 4.5 | Claude Sonnet 5 |
|---|---|---|
| LMArena Instruction Following | 1459 | 1452 |
| IFEval | 85% | — |

## Long Context

- Claude Sonnet 4.5: 45.2 (#46)
- Claude Sonnet 5: 44.8 (#55)

| Benchmark | Claude Sonnet 4.5 | Claude Sonnet 5 |
|---|---|---|
| LMArena Longer Query | 1476 | 1463 |

## Writing & Preference

- Claude Sonnet 4.5: 66.5 (#34)
- Claude Sonnet 5: 69.2 (#25)

| Benchmark | Claude Sonnet 4.5 | Claude Sonnet 5 |
|---|---|---|
| LMArena Text | 1439 | 1442 |
| LMArena Creative Writing | 1442 | 1416 |
| EQ-Bench Creative Writing | 1678 | 1794 |
| LMArena Multi-Turn | 1465 | 1454 |
| WildBench | 85.4% | — |
| EQ-Bench 4 | — | 1236 |

## FAQ

### Is Claude Sonnet 4.5 better than Claude Sonnet 5?

Claude Sonnet 5 is the stronger model overall, scoring 54.6 to 44.1 on the Noometry Index.

### Which is cheaper, Claude Sonnet 4.5 or Claude Sonnet 5?

Claude Sonnet 5 is cheaper. It lists at $2 per million input tokens and $10 per million output tokens; Claude Sonnet 4.5 lists at $3 and $15.

### Is Claude Sonnet 4.5 or Claude Sonnet 5 better for coding?

Claude Sonnet 5 scores higher on coding benchmarks: 55.5 versus 47.3 in the Noometry coding category.

### Which has the bigger context window?

Claude Sonnet 5 does, with 1M tokens against 200K.

### How many benchmarks do Claude Sonnet 4.5 and Claude Sonnet 5 share?

41 benchmarks have published results for both models. Claude Sonnet 4.5 has 73 scored results on Noometry and Claude Sonnet 5 has 51.