Model comparison
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.
Last verified . 1 shared benchmarks.
UpstageSummary
- 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.
Side by side
| GPT-5.3 Codex | Solar Pro4 | |
|---|---|---|
| Provider | OpenAI | Upstage |
| Noometry Index | 45.5 | 41.5 |
| Released | 2026-02-05 | 2026-08-06 |
| Weights | Proprietary | Proprietary |
| Context window | 400K | 524K |
| Max output | 128K | 131K |
| Input $ / M tokens | $1.75 | $0.30 |
| Output $ / M tokens | $14 | $1.20 |
| Results tracked | 8 | 18 |
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Category by category
Coding GPT-5.3 Codex leads
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 Not comparable
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 Not comparable
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 Not comparable
GPT-5.3 Codex: —, Solar Pro4: 36.1 (#129)
| Benchmark | GPT-5.3 Codex | Solar Pro4 |
|---|---|---|
| LMArena Math | — | 1418 |
Knowledge Not comparable
GPT-5.3 Codex: —, Solar Pro4: 39.0 (#128)
| Benchmark | GPT-5.3 Codex | Solar Pro4 |
|---|---|---|
| LMArena Expert | — | 1421 |
Multilingual Not comparable
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 Not comparable
GPT-5.3 Codex: —, Solar Pro4: 72.8 (#128)
| Benchmark | GPT-5.3 Codex | Solar Pro4 |
|---|---|---|
| LMArena Instruction Following | — | 1376 |
Long Context Not comparable
GPT-5.3 Codex: —, Solar Pro4: 42.0 (#125)
| Benchmark | GPT-5.3 Codex | Solar Pro4 |
|---|---|---|
| LMArena Longer Query | — | 1379 |
Writing & Preference Not comparable
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 |
Frequently asked questions
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.