# GPT-5 Pro vs Sonar

> GPT-5 Pro is the stronger model overall, scoring 46.4 to 38.5 on the Noometry Index. Sonar costs 41× less per token, which makes it the better buy when GPT-5 Pro's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/gpt-5-pro-vs-sonar
- Last updated: 2026-10-11
- Shared benchmarks: 0

## Summary

- The widest gap is in reasoning, where GPT-5 Pro leads 38.9 to 21.1.
- Sonar is cheaper at $1 / $1 per million input/output tokens, against $15 / $120 for GPT-5 Pro.
- GPT-5 Pro accepts more context: 400K tokens versus 128K.

## Snapshot

| | GPT-5 Pro | Sonar |
|---|---|---|
| Provider | OpenAI | Perplexity |
| Noometry Index | 46.4 | 38.5 |
| Rank | 64 | 187 |
| Context | 400K | 128K |
| Input $/M | $15 | $1 |
| Output $/M | $120 | $1 |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-5 Pro: 44.0 (#80)
- Sonar: 35.7 (#221)

| Benchmark | GPT-5 Pro | Sonar |
|---|---|---|
| WeirdML | 60.4% | — |
| LiveBench Coding | — | 35.1% |
| AlgoTune | 1.31 | — |

## Reasoning

- GPT-5 Pro: 38.9 (#62)
- Sonar: 21.1 (#227)

| Benchmark | GPT-5 Pro | Sonar |
|---|---|---|
| ARC-AGI-2 | 18.3% | — |
| SimpleBench | 61.6% | — |
| Kagi LLM Benchmark | 76.8% | — |
| ARC-AGI-1 | 70.2% | — |
| EnigmaEval | 18.8% | — |
| LiveBench Reasoning | — | 46.3% |
| LiveBench Data Analysis | — | 37.9% |
| Epoch Capabilities Index | 150.28 | — |
| LiveBench | — | 46.9% |

## Math

- GPT-5 Pro: 48.5 (#63)
- Sonar: 33.7 (#200)

| Benchmark | GPT-5 Pro | Sonar |
|---|---|---|
| FrontierMath (Tiers 1-3) | 55.8% | — |
| FrontierMath Tier 4 | 19.5% | — |
| LiveBench Math | — | 41.6% |
| FrontierMath Tier 4 (v1) | 14.6% | — |

## Knowledge

- GPT-5 Pro: 56.7 (#42)
- Sonar: —

| Benchmark | GPT-5 Pro | Sonar |
|---|---|---|
| Humanity's Last Exam | 31.6% | — |

## Instruction Following

- GPT-5 Pro: —
- Sonar: 71.4 (#150)

| Benchmark | GPT-5 Pro | Sonar |
|---|---|---|
| LiveBench Instruction Following | — | 76.2% |

## Writing & Preference

- GPT-5 Pro: —
- Sonar: 52.6 (#167)

| Benchmark | GPT-5 Pro | Sonar |
|---|---|---|
| LiveBench Language | — | 44.1% |

## FAQ

### Is GPT-5 Pro better than Sonar?

GPT-5 Pro is the stronger model overall, scoring 46.4 to 38.5 on the Noometry Index. Sonar costs 41× less per token, which makes it the better buy when GPT-5 Pro's lead doesn't matter for your workload.

### Which is cheaper, GPT-5 Pro or Sonar?

Sonar is cheaper. It lists at $1 per million input tokens and $1 per million output tokens; GPT-5 Pro lists at $15 and $120.

### Is GPT-5 Pro or Sonar better for coding?

GPT-5 Pro scores higher on coding benchmarks: 44.0 versus 35.7 in the Noometry coding category.

### Which has the bigger context window?

GPT-5 Pro does, with 400K tokens against 128K.

### How many benchmarks do GPT-5 Pro and Sonar share?

0 benchmarks have published results for both models. GPT-5 Pro has 12 scored results on Noometry and Sonar has 7.