# Claude Sonnet 5.5 vs Hermes 4 405B

> Claude Sonnet 5.5 has enough public results to be ranked (#10); Hermes 4 405B does not yet, so treat this comparison as directional.

- Canonical page: https://noometry.com/compare/claude-sonnet-5-5-vs-hermes-4-405b
- Last updated: 2026-10-12
- Shared benchmarks: 0

## Summary

- The widest gap is in reasoning, where Claude Sonnet 5.5 leads 54.0 to 26.1.
- Hermes 4 405B is cheaper at $1 / $3 per million input/output tokens, against $2 / $10 for Claude Sonnet 5.5.
- Claude Sonnet 5.5 accepts more context: 1M tokens versus 131K.
- Hermes 4 405B has downloadable open weights; the other is API-only.

## Snapshot

| | Claude Sonnet 5.5 | Hermes 4 405B |
|---|---|---|
| Provider | Anthropic | Nous Research |
| Noometry Index | 61.9 | 37.6 |
| Rank | 10 | — |
| Context | 1M | 131K |
| Input $/M | $2 | $1 |
| Output $/M | $10 | $3 |
| Weights | Proprietary | Open |

## Coding

- Claude Sonnet 5.5: 67.3 (#6)
- Hermes 4 405B: —

| Benchmark | Claude Sonnet 5.5 | Hermes 4 405B |
|---|---|---|
| FrontierCode | 52.1% | — |
| CursorBench | 55.5% | — |
| LMArena WebDev | 1774 | — |
| FrontierSWE | 61.9% | — |
| SciCode | 61% | — |
| LMArena Coding | 1513 | — |
| ALE-Bench | 1,819 | — |

## Agentic & Tool Use

- Claude Sonnet 5.5: 45.0 (#16)
- Hermes 4 405B: —

| Benchmark | Claude Sonnet 5.5 | Hermes 4 405B |
|---|---|---|
| APEX-Agents | 75.5% | — |

## Reasoning

- Claude Sonnet 5.5: 54.0 (#28)
- Hermes 4 405B: 26.1

| Benchmark | Claude Sonnet 5.5 | Hermes 4 405B |
|---|---|---|
| Kagi LLM Benchmark | — | 55.8% |
| NYT Connections (extended) | 80.5% | — |
| CritPt | 31.4% | — |
| LMArena Hard Prompts | 1495 | — |
| Mystery Game Puzzles | 65% | — |
| Epoch Capabilities Index | 165.03 | — |

## Math

- Claude Sonnet 5.5: 87.9 (#6)
- Hermes 4 405B: —

| Benchmark | Claude Sonnet 5.5 | Hermes 4 405B |
|---|---|---|
| FrontierMath (Tiers 1-3) | 88.8% | — |
| FrontierMath Tier 4 | 80.5% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| ProofBench | 100% | — |
| LMArena Math | 1510 | — |
| FrontierMath Erdős | 2.9% | — |

## Knowledge

- Claude Sonnet 5.5: 66.0 (#12)
- Hermes 4 405B: —

| Benchmark | Claude Sonnet 5.5 | Hermes 4 405B |
|---|---|---|
| GPQA Diamond | 95.6% | — |
| SimpleQA Verified | 46.5% | — |
| LMArena Expert | 1540 | — |

## Multimodal

- Claude Sonnet 5.5: 51.5 (#6)
- Hermes 4 405B: —

| Benchmark | Claude Sonnet 5.5 | Hermes 4 405B |
|---|---|---|
| LMArena Vision | 1289 | — |
| Furniture Assembly | 75% | — |

## Multilingual

- Claude Sonnet 5.5: 55.3 (#30)
- Hermes 4 405B: —

| Benchmark | Claude Sonnet 5.5 | Hermes 4 405B |
|---|---|---|
| LMArena Non-English | 1452 | — |
| LMArena Chinese | 1522 | — |
| LMArena Russian | 1451 | — |

## Instruction Following

- Claude Sonnet 5.5: 78.3 (#11)
- Hermes 4 405B: —

| Benchmark | Claude Sonnet 5.5 | Hermes 4 405B |
|---|---|---|
| LMArena Instruction Following | 1495 | — |

## Long Context

- Claude Sonnet 5.5: 45.9 (#28)
- Hermes 4 405B: —

| Benchmark | Claude Sonnet 5.5 | Hermes 4 405B |
|---|---|---|
| LMArena Longer Query | 1498 | — |

## Writing & Preference

- Claude Sonnet 5.5: 66.0 (#40)
- Hermes 4 405B: 52.9

| Benchmark | Claude Sonnet 5.5 | Hermes 4 405B |
|---|---|---|
| LMArena Text | 1471 | — |
| LMArena Creative Writing | 1465 | — |
| EQ-Bench Creative Writing | — | 1421 |
| LMArena Multi-Turn | 1474 | — |

## FAQ

### Is Claude Sonnet 5.5 better than Hermes 4 405B?

Claude Sonnet 5.5 has enough public results to be ranked (#10); Hermes 4 405B does not yet, so treat this comparison as directional.

### Which is cheaper, Claude Sonnet 5.5 or Hermes 4 405B?

Hermes 4 405B is cheaper. It lists at $1 per million input tokens and $3 per million output tokens; Claude Sonnet 5.5 lists at $2 and $10.

### Which has the bigger context window?

Claude Sonnet 5.5 does, with 1M tokens against 131K.

### How many benchmarks do Claude Sonnet 5.5 and Hermes 4 405B share?

0 benchmarks have published results for both models. Claude Sonnet 5.5 has 32 scored results on Noometry and Hermes 4 405B has 2.