# Claude Sonnet 5.5 vs Sonar Reasoning Pro

> Claude Sonnet 5.5 has enough public results to be ranked (#10); Sonar Reasoning Pro does not yet, so treat this comparison as directional.

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

## Summary

- Sonar Reasoning Pro is cheaper at $2 / $8 per million input/output tokens, against $2 / $10 for Claude Sonnet 5.5.
- Claude Sonnet 5.5 accepts more context: 1M tokens versus 128K.

## Snapshot

| | Claude Sonnet 5.5 | Sonar Reasoning Pro |
|---|---|---|
| Provider | Anthropic | Perplexity |
| Noometry Index | 60.5 | — |
| Rank | 10 | — |
| Context | 1M | 128K |
| Input $/M | $2 | $2 |
| Output $/M | $10 | $8 |
| Weights | Proprietary | Proprietary |

## Coding

- Claude Sonnet 5.5: 65.5 (#6)
- Sonar Reasoning Pro: —

| Benchmark | Claude Sonnet 5.5 | Sonar Reasoning 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)
- Sonar Reasoning Pro: —

| Benchmark | Claude Sonnet 5.5 | Sonar Reasoning Pro |
|---|---|---|
| APEX-Agents | 75.5% | — |
| LMArena Search | — | 1139 |

## Reasoning

- Claude Sonnet 5.5: 52.4 (#29)
- Sonar Reasoning Pro: —

| Benchmark | Claude Sonnet 5.5 | Sonar Reasoning Pro |
|---|---|---|
| CritPt | 31.4% | — |
| Mystery Game Puzzles | 65% | — |

## Math

- Claude Sonnet 5.5: 88.7 (#4)
- Sonar Reasoning Pro: —

| Benchmark | Claude Sonnet 5.5 | Sonar Reasoning 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)
- Sonar Reasoning Pro: —

| Benchmark | Claude Sonnet 5.5 | Sonar Reasoning Pro |
|---|---|---|
| GPQA Diamond | 95.6% | — |
| SimpleQA Verified | 46.5% | — |

## Multimodal

- Claude Sonnet 5.5: 53.2 (#5)
- Sonar Reasoning Pro: —

| Benchmark | Claude Sonnet 5.5 | Sonar Reasoning Pro |
|---|---|---|
| Furniture Assembly | 75% | — |

## FAQ

### Is Claude Sonnet 5.5 better than Sonar Reasoning Pro?

Claude Sonnet 5.5 has enough public results to be ranked (#10); Sonar Reasoning Pro does not yet, so treat this comparison as directional.

### Which is cheaper, Claude Sonnet 5.5 or Sonar Reasoning Pro?

Sonar Reasoning Pro is cheaper. It lists at $2 per million input tokens and $8 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 128K.

### How many benchmarks do Claude Sonnet 5.5 and Sonar Reasoning Pro share?

0 benchmarks have published results for both models. Claude Sonnet 5.5 has 16 scored results on Noometry and Sonar Reasoning Pro has 1.