# Claude Sonnet 5.5 vs o1-pro

> Claude Sonnet 5.5 is the stronger model overall, scoring 60.5 to 31.2 on the Noometry Index.

- Canonical page: https://noometry.com/compare/claude-sonnet-5-5-vs-o1-pro
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- The widest gap is in knowledge, where Claude Sonnet 5.5 leads 66.0 to 29.3.
- Claude Sonnet 5.5 is cheaper at $2 / $10 per million input/output tokens, against $150 / $600 for o1-pro.
- Claude Sonnet 5.5 accepts more context: 1M tokens versus 200K.

## Snapshot

| | Claude Sonnet 5.5 | o1-pro |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Noometry Index | 60.5 | 31.2 |
| Rank | 10 | 264 |
| Context | 1M | 200K |
| Input $/M | $2 | $150 |
| Output $/M | $10 | $600 |
| Weights | Proprietary | Proprietary |

## Coding

- Claude Sonnet 5.5: 65.5 (#6)
- o1-pro: —

| Benchmark | Claude Sonnet 5.5 | o1-pro |
|---|---|---|
| FrontierCode | 52.1% | — |
| CursorBench | 55.5% | — |
| LMArena WebDev | 1699 | — |
| FrontierSWE | 61.9% | — |
| SciCode | 61% | — |
| ALE-Bench | 1,819 | — |

## Agentic & Tool Use

- Claude Sonnet 5.5: 44.9 (#14)
- o1-pro: —

| Benchmark | Claude Sonnet 5.5 | o1-pro |
|---|---|---|
| APEX-Agents | 75.5% | — |

## Reasoning

- Claude Sonnet 5.5: 52.4 (#29)
- o1-pro: 20.2 (#223)

| Benchmark | Claude Sonnet 5.5 | o1-pro |
|---|---|---|
| ARC-AGI-1 | — | 23.3% |
| CritPt | 31.4% | — |
| EnigmaEval | — | 6.1% |
| Mystery Game Puzzles | 65% | — |

## Math

- Claude Sonnet 5.5: 88.7 (#4)
- o1-pro: —

| Benchmark | Claude Sonnet 5.5 | o1-pro |
|---|---|---|
| FrontierMath (Tiers 1-3) | 88.8% | — |
| FrontierMath Tier 4 | 80.5% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| ProofBench | 100% | — |

## Knowledge

- Claude Sonnet 5.5: 66.0 (#11)
- o1-pro: 29.3 (#227)

| Benchmark | Claude Sonnet 5.5 | o1-pro |
|---|---|---|
| GPQA Diamond | 95.6% | — |
| Humanity's Last Exam | — | 8.1% |
| SimpleQA Verified | 46.5% | — |

## Multimodal

- Claude Sonnet 5.5: 53.2 (#5)
- o1-pro: —

| Benchmark | Claude Sonnet 5.5 | o1-pro |
|---|---|---|
| Furniture Assembly | 75% | — |

## FAQ

### Is Claude Sonnet 5.5 better than o1-pro?

Claude Sonnet 5.5 is the stronger model overall, scoring 60.5 to 31.2 on the Noometry Index.

### Which is cheaper, Claude Sonnet 5.5 or o1-pro?

Claude Sonnet 5.5 is cheaper. It lists at $2 per million input tokens and $10 per million output tokens; o1-pro lists at $150 and $600.

### Which has the bigger context window?

Claude Sonnet 5.5 does, with 1M tokens against 200K.

### How many benchmarks do Claude Sonnet 5.5 and o1-pro share?

0 benchmarks have published results for both models. Claude Sonnet 5.5 has 16 scored results on Noometry and o1-pro has 3.