# GPT-5.5 Pro vs Sonar

> GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 37.8 on the Noometry Index. Sonar costs 68× less per token, which makes it the better buy when GPT-5.5 Pro's lead doesn't matter for your workload.

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

## Summary

- The widest gap is in reasoning, where GPT-5.5 Pro leads 73.6 to 20.3.
- Sonar is cheaper at $1 / $1 per million input/output tokens, against $30 / $180 for GPT-5.5 Pro.
- GPT-5.5 Pro accepts more context: 1.05M tokens versus 128K.

## Snapshot

| | GPT-5.5 Pro | Sonar |
|---|---|---|
| Provider | OpenAI | Perplexity |
| Noometry Index | 64.3 | 37.8 |
| Rank | 7 | 184 |
| Context | 1.05M | 128K |
| Input $/M | $30 | $1 |
| Output $/M | $180 | $1 |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-5.5 Pro: —
- Sonar: 35.1 (#217)

| Benchmark | GPT-5.5 Pro | Sonar |
|---|---|---|
| LiveBench Coding | — | 35.1% |

## Reasoning

- GPT-5.5 Pro: 73.6 (#7)
- Sonar: 20.3 (#221)

| Benchmark | GPT-5.5 Pro | Sonar |
|---|---|---|
| ARC-AGI-2 | 84.6% | — |
| SimpleBench | 76.9% | — |
| ARC-AGI-1 | 96.5% | — |
| CritPt | 30.6% | — |
| Chess Puzzles | 64% | — |
| LiveBench Reasoning | — | 46.3% |
| DTBench | 96% | — |
| LiveBench Data Analysis | — | 37.9% |
| LMCA | 53.9% | — |
| Epoch Capabilities Index | 162.45 | — |
| LiveBench | — | 46.9% |

## Math

- GPT-5.5 Pro: 83.8 (#8)
- Sonar: 31.3 (#197)

| Benchmark | GPT-5.5 Pro | Sonar |
|---|---|---|
| FrontierMath (Tiers 1-3) | 87.7% | — |
| FrontierMath Tier 4 | 78% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| LiveBench Math | — | 41.6% |
| FrontierMath (Feb 2025 set) | 52.4% | — |
| FrontierMath Tier 4 (v1) | 39.6% | — |

## Knowledge

- GPT-5.5 Pro: 64.2 (#17)
- Sonar: —

| Benchmark | GPT-5.5 Pro | Sonar |
|---|---|---|
| GPQA Diamond | 93.9% | — |

## Instruction Following

- GPT-5.5 Pro: —
- Sonar: 71.5 (#146)

| Benchmark | GPT-5.5 Pro | Sonar |
|---|---|---|
| LiveBench Instruction Following | — | 76.2% |

## Writing & Preference

- GPT-5.5 Pro: —
- Sonar: 52.6 (#166)

| Benchmark | GPT-5.5 Pro | Sonar |
|---|---|---|
| LiveBench Language | — | 44.1% |

## FAQ

### Is GPT-5.5 Pro better than Sonar?

GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 37.8 on the Noometry Index. Sonar costs 68× less per token, which makes it the better buy when GPT-5.5 Pro's lead doesn't matter for your workload.

### Which is cheaper, GPT-5.5 Pro or Sonar?

Sonar is cheaper. It lists at $1 per million input tokens and $1 per million output tokens; GPT-5.5 Pro lists at $30 and $180.

### Which has the bigger context window?

GPT-5.5 Pro does, with 1.05M tokens against 128K.

### How many benchmarks do GPT-5.5 Pro and Sonar share?

0 benchmarks have published results for both models. GPT-5.5 Pro has 14 scored results on Noometry and Sonar has 7.