# GPT-5.3 Chat vs Solar Pro4

> GPT-5.3 Chat and Solar Pro4 score almost the same on the Noometry Index (42.8 vs 42.1), so choose on price, context window or the category you care about most.

- Canonical page: https://noometry.com/compare/gpt-5-3-chat-vs-solar-pro4
- Last updated: 2026-10-10
- Shared benchmarks: 17

## Summary

- They share 17 benchmarks with published results for both. GPT-5.3 Chat scores higher in 6 categories and Solar Pro4 in 2 categories; 3 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where GPT-5.3 Chat leads 63.1 to 56.5.
- Solar Pro4 is cheaper at $0.30 / $1.20 per million input/output tokens, against $1.75 / $14 for GPT-5.3 Chat.
- Solar Pro4 accepts more context: 524K tokens versus 128K.

## Snapshot

| | GPT-5.3 Chat | Solar Pro4 |
|---|---|---|
| Provider | OpenAI | Upstage |
| Noometry Index | 42.8 | 42.1 |
| Rank | 109 | 121 |
| Context | 128K | 524K |
| Input $/M | $1.75 | $0.30 |
| Output $/M | $14 | $1.20 |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-5.3 Chat: 41.4 (#124)
- Solar Pro4: 40.1 (#149)

| Benchmark | GPT-5.3 Chat | Solar Pro4 |
|---|---|---|
| LMArena Coding | 1408 | 1437 |
| LMArena WebDev | — | 1371 |

## Reasoning

- GPT-5.3 Chat: 28.5 (#102)
- Solar Pro4: 28.5 (#104)

| Benchmark | GPT-5.3 Chat | Solar Pro4 |
|---|---|---|
| LMArena Hard Prompts | 1399 | 1399 |

## Math

- GPT-5.3 Chat: 38.2 (#142)
- Solar Pro4: 38.8 (#128)

| Benchmark | GPT-5.3 Chat | Solar Pro4 |
|---|---|---|
| LMArena Math | 1389 | 1416 |

## Knowledge

- GPT-5.3 Chat: 38.8 (#140)
- Solar Pro4: 39.8 (#129)

| Benchmark | GPT-5.3 Chat | Solar Pro4 |
|---|---|---|
| LMArena Expert | 1397 | 1427 |

## Multilingual

- GPT-5.3 Chat: 50.3 (#124)
- Solar Pro4: 48.7 (#139)

| Benchmark | GPT-5.3 Chat | Solar Pro4 |
|---|---|---|
| LMArena Non-English | 1382 | 1361 |
| LMArena Chinese | 1432 | 1415 |
| LMArena French | 1397 | 1397 |
| LMArena German | 1384 | 1364 |
| LMArena Japanese | 1352 | 1309 |
| LMArena Korean | 1346 | 1382 |
| LMArena Russian | 1400 | 1360 |
| LMArena Spanish | 1371 | 1401 |

## Instruction Following

- GPT-5.3 Chat: 72.8 (#129)
- Solar Pro4: 72.7 (#132)

| Benchmark | GPT-5.3 Chat | Solar Pro4 |
|---|---|---|
| LMArena Instruction Following | 1378 | 1377 |

## Long Context

- GPT-5.3 Chat: 42.6 (#120)
- Solar Pro4: 42.1 (#130)

| Benchmark | GPT-5.3 Chat | Solar Pro4 |
|---|---|---|
| LMArena Longer Query | 1396 | 1381 |

## Writing & Preference

- GPT-5.3 Chat: 63.1 (#68)
- Solar Pro4: 56.5 (#138)

| Benchmark | GPT-5.3 Chat | Solar Pro4 |
|---|---|---|
| LMArena Text | 1389 | 1386 |
| LMArena Creative Writing | 1355 | 1316 |
| LMArena Multi-Turn | 1412 | 1385 |
| EQ-Bench Creative Writing | 1690 | — |

## FAQ

### Is GPT-5.3 Chat better than Solar Pro4?

GPT-5.3 Chat and Solar Pro4 score almost the same on the Noometry Index (42.8 vs 42.1), so choose on price, context window or the category you care about most.

### Which is cheaper, GPT-5.3 Chat or Solar Pro4?

Solar Pro4 is cheaper. It lists at $0.30 per million input tokens and $1.20 per million output tokens; GPT-5.3 Chat lists at $1.75 and $14.

### Is GPT-5.3 Chat or Solar Pro4 better for coding?

GPT-5.3 Chat scores higher on coding benchmarks: 41.4 versus 40.1 in the Noometry coding category.

### Which has the bigger context window?

Solar Pro4 does, with 524K tokens against 128K.

### How many benchmarks do GPT-5.3 Chat and Solar Pro4 share?

17 benchmarks have published results for both models. GPT-5.3 Chat has 18 scored results on Noometry and Solar Pro4 has 18.