# GPT-5.3 Chat vs Sonar

> GPT-5.3 Chat is the stronger model overall, scoring 42.1 to 37.8 on the Noometry Index. Sonar costs 4.8× less per token, which makes it the better buy when GPT-5.3 Chat's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/gpt-5-3-chat-vs-sonar
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- The widest gap is in writing & preference, where GPT-5.3 Chat leads 63.3 to 52.6.
- Sonar is cheaper at $1 / $1 per million input/output tokens, against $1.75 / $14 for GPT-5.3 Chat.

## Snapshot

| | GPT-5.3 Chat | Sonar |
|---|---|---|
| Provider | OpenAI | Perplexity |
| Noometry Index | 42.1 | 37.8 |
| Rank | 109 | 184 |
| Context | 128K | 128K |
| Input $/M | $1.75 | $1 |
| Output $/M | $14 | $1 |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-5.3 Chat: 40.8 (#124)
- Sonar: 35.1 (#217)

| Benchmark | GPT-5.3 Chat | Sonar |
|---|---|---|
| LiveBench Coding | — | 35.1% |
| LMArena Coding | 1408 | — |

## Reasoning

- GPT-5.3 Chat: 27.3 (#105)
- Sonar: 20.3 (#221)

| Benchmark | GPT-5.3 Chat | Sonar |
|---|---|---|
| LiveBench Reasoning | — | 46.3% |
| LMArena Hard Prompts | 1399 | — |
| LiveBench Data Analysis | — | 37.9% |
| LiveBench | — | 46.9% |

## Math

- GPT-5.3 Chat: 35.4 (#146)
- Sonar: 31.3 (#197)

| Benchmark | GPT-5.3 Chat | Sonar |
|---|---|---|
| LiveBench Math | — | 41.6% |
| LMArena Math | 1389 | — |

## Knowledge

- GPT-5.3 Chat: 38.2 (#137)
- Sonar: —

| Benchmark | GPT-5.3 Chat | Sonar |
|---|---|---|
| LMArena Expert | 1397 | — |

## Multilingual

- GPT-5.3 Chat: 50.5 (#119)
- Sonar: —

| Benchmark | GPT-5.3 Chat | Sonar |
|---|---|---|
| LMArena Non-English | 1383 | — |
| LMArena Chinese | 1433 | — |
| LMArena French | 1398 | — |
| LMArena German | 1384 | — |
| LMArena Japanese | 1351 | — |
| LMArena Korean | 1347 | — |
| LMArena Russian | 1400 | — |
| LMArena Spanish | 1371 | — |

## Instruction Following

- GPT-5.3 Chat: 73.0 (#124)
- Sonar: 71.5 (#146)

| Benchmark | GPT-5.3 Chat | Sonar |
|---|---|---|
| LiveBench Instruction Following | — | 76.2% |
| LMArena Instruction Following | 1378 | — |

## Long Context

- GPT-5.3 Chat: 42.6 (#115)
- Sonar: —

| Benchmark | GPT-5.3 Chat | Sonar |
|---|---|---|
| LMArena Longer Query | 1396 | — |

## Writing & Preference

- GPT-5.3 Chat: 63.3 (#65)
- Sonar: 52.6 (#166)

| Benchmark | GPT-5.3 Chat | Sonar |
|---|---|---|
| LMArena Text | 1389 | — |
| LMArena Creative Writing | 1356 | — |
| EQ-Bench Creative Writing | 1690 | — |
| LMArena Multi-Turn | 1413 | — |
| LiveBench Language | — | 44.1% |

## FAQ

### Is GPT-5.3 Chat better than Sonar?

GPT-5.3 Chat is the stronger model overall, scoring 42.1 to 37.8 on the Noometry Index. Sonar costs 4.8× less per token, which makes it the better buy when GPT-5.3 Chat's lead doesn't matter for your workload.

### Which is cheaper, GPT-5.3 Chat or Sonar?

Sonar is cheaper. It lists at $1 per million input tokens and $1 per million output tokens; GPT-5.3 Chat lists at $1.75 and $14.

### Is GPT-5.3 Chat or Sonar better for coding?

GPT-5.3 Chat scores higher on coding benchmarks: 40.8 versus 35.1 in the Noometry coding category.

### Which has the bigger context window?

Both accept 128K tokens.

### How many benchmarks do GPT-5.3 Chat and Sonar share?

0 benchmarks have published results for both models. GPT-5.3 Chat has 18 scored results on Noometry and Sonar has 7.