# GPT-5.3 Codex vs Solar Pro4

> GPT-5.3 Codex is the stronger model overall, scoring 45.5 to 41.5 on the Noometry Index. Solar Pro4 costs 9.2× less per token, which makes it the better buy when GPT-5.3 Codex's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/gpt-5-3-codex-vs-solar-pro4
- Last updated: 2026-10-10
- Shared benchmarks: 1

## Summary

- They share 1 benchmark with published results for both. GPT-5.3 Codex scores higher in 1 category and Solar Pro4 in 0 categories; one gap is clear of the uncertainty.
- The widest gap is in coding, where GPT-5.3 Codex leads 48.5 to 39.9.
- Solar Pro4 is cheaper at $0.30 / $1.20 per million input/output tokens, against $1.75 / $14 for GPT-5.3 Codex.
- Solar Pro4 accepts more context: 524K tokens versus 400K.

## Snapshot

| | GPT-5.3 Codex | Solar Pro4 |
|---|---|---|
| Provider | OpenAI | Upstage |
| Noometry Index | 45.5 | 41.5 |
| Rank | 61 | 123 |
| Context | 400K | 524K |
| Input $/M | $1.75 | $0.30 |
| Output $/M | $14 | $1.20 |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-5.3 Codex: 48.5 (#51)
- Solar Pro4: 39.9 (#135)

| Benchmark | GPT-5.3 Codex | Solar Pro4 |
|---|---|---|
| LMArena WebDev | 1408 | 1371 |
| SWE-bench Verified | 74.8% | — |
| WeirdML | 79.3% | — |
| LMArena Coding | — | 1439 |
| ALE-Bench | 1,655 | — |

## Agentic & Tool Use

- GPT-5.3 Codex: 47.8 (#9)
- Solar Pro4: —

| Benchmark | GPT-5.3 Codex | Solar Pro4 |
|---|---|---|
| Terminal-Bench | 78.4% | — |
| METR Time Horizons | 74.5% | — |
| Vending-Bench 2 | 5,940 | — |

## Reasoning

- GPT-5.3 Codex: —
- Solar Pro4: 27.3 (#107)

| Benchmark | GPT-5.3 Codex | Solar Pro4 |
|---|---|---|
| LMArena Hard Prompts | — | 1398 |
| Epoch Capabilities Index | 156.84 | — |

## Math

- GPT-5.3 Codex: —
- Solar Pro4: 36.1 (#129)

| Benchmark | GPT-5.3 Codex | Solar Pro4 |
|---|---|---|
| LMArena Math | — | 1418 |

## Knowledge

- GPT-5.3 Codex: —
- Solar Pro4: 39.0 (#128)

| Benchmark | GPT-5.3 Codex | Solar Pro4 |
|---|---|---|
| LMArena Expert | — | 1421 |

## Multilingual

- GPT-5.3 Codex: —
- Solar Pro4: 49.0 (#134)

| Benchmark | GPT-5.3 Codex | Solar Pro4 |
|---|---|---|
| LMArena Non-English | — | 1362 |
| LMArena Chinese | — | 1417 |
| LMArena French | — | 1403 |
| LMArena German | — | 1351 |
| LMArena Japanese | — | 1300 |
| LMArena Korean | — | 1383 |
| LMArena Russian | — | 1360 |
| LMArena Spanish | — | 1408 |

## Instruction Following

- GPT-5.3 Codex: —
- Solar Pro4: 72.8 (#128)

| Benchmark | GPT-5.3 Codex | Solar Pro4 |
|---|---|---|
| LMArena Instruction Following | — | 1376 |

## Long Context

- GPT-5.3 Codex: —
- Solar Pro4: 42.0 (#125)

| Benchmark | GPT-5.3 Codex | Solar Pro4 |
|---|---|---|
| LMArena Longer Query | — | 1379 |

## Writing & Preference

- GPT-5.3 Codex: —
- Solar Pro4: 56.7 (#133)

| Benchmark | GPT-5.3 Codex | Solar Pro4 |
|---|---|---|
| LMArena Text | — | 1386 |
| LMArena Creative Writing | — | 1313 |
| LMArena Multi-Turn | — | 1391 |

## FAQ

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

GPT-5.3 Codex is the stronger model overall, scoring 45.5 to 41.5 on the Noometry Index. Solar Pro4 costs 9.2× less per token, which makes it the better buy when GPT-5.3 Codex's lead doesn't matter for your workload.

### Which is cheaper, GPT-5.3 Codex 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 Codex lists at $1.75 and $14.

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

GPT-5.3 Codex scores higher on coding benchmarks: 48.5 versus 39.9 in the Noometry coding category.

### Which has the bigger context window?

Solar Pro4 does, with 524K tokens against 400K.

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

1 benchmark has published results for both models. GPT-5.3 Codex has 8 scored results on Noometry and Solar Pro4 has 18.