Model comparison

GPT-5.2 Codex vs Solar Pro4

GPT-5.2 Codex and Solar Pro4 score almost the same on the Noometry Index (42.2 vs 41.5), so choose on price, context window or the category you care about most.

Last verified October 10, 2026. 1 shared benchmarks.

GPT-5.2 Codex OpenAI

42.2

Rank #107 Reported

Solar Pro4

Upstage

41.5

Rank #123 Confirmed

Summary

They share 1 benchmark with published results for both. GPT-5.2 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-5.2 Codex leads 45.4 to 39.9.
Solar Pro4 is cheaper at $0.30 / $1.20 per million input/output tokens, against $1.75 / $14 for GPT-5.2 Codex.
Solar Pro4 accepts more context: 524K tokens versus 400K.

Side by side

GPT-5.2 Codex and Solar Pro4 specifications
	GPT-5.2 Codex	Solar Pro4
Provider	OpenAI	Upstage
Noometry Index	42.2	41.5
Released	2025-12-18	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	5	18

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Category by category

Coding GPT-5.2 Codex leads

GPT-5.2 Codex: 45.4 (#66), Solar Pro4: 39.9 (#135)

Coding benchmarks
Benchmark	GPT-5.2 Codex	Solar Pro4
LMArena WebDev	1339	1371
SWE-bench Verified (bash only)	72.8%	—
SWE-bench Multilingual	66.3%	—
LMArena Coding	—	1439
ALE-Bench	1,300	—

Agentic & Tool Use Not comparable

GPT-5.2 Codex: 40.7 (#20), Solar Pro4: —

Agentic & Tool Use benchmarks
Benchmark	GPT-5.2 Codex	Solar Pro4
Terminal-Bench	66.5%	—

Reasoning Not comparable

GPT-5.2 Codex: —, Solar Pro4: 27.3 (#107)

Reasoning benchmarks
Benchmark	GPT-5.2 Codex	Solar Pro4
LMArena Hard Prompts	—	1398

Math Not comparable

GPT-5.2 Codex: —, Solar Pro4: 36.1 (#129)

Math benchmarks
Benchmark	GPT-5.2 Codex	Solar Pro4
LMArena Math	—	1418

Knowledge Not comparable

GPT-5.2 Codex: —, Solar Pro4: 39.0 (#128)

Knowledge benchmarks
Benchmark	GPT-5.2 Codex	Solar Pro4
LMArena Expert	—	1421

Multilingual Not comparable

GPT-5.2 Codex: —, Solar Pro4: 49.0 (#134)

Multilingual benchmarks
Benchmark	GPT-5.2 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-5.2 Codex: —, Solar Pro4: 72.8 (#128)

Instruction Following benchmarks
Benchmark	GPT-5.2 Codex	Solar Pro4
LMArena Instruction Following	—	1376

Long Context Not comparable

GPT-5.2 Codex: —, Solar Pro4: 42.0 (#125)

Long Context benchmarks
Benchmark	GPT-5.2 Codex	Solar Pro4
LMArena Longer Query	—	1379

Writing & Preference Not comparable

GPT-5.2 Codex: —, Solar Pro4: 56.7 (#133)

Writing & Preference benchmarks
Benchmark	GPT-5.2 Codex	Solar Pro4
LMArena Text	—	1386
LMArena Creative Writing	—	1313
LMArena Multi-Turn	—	1391

Frequently asked questions

Is GPT-5.2 Codex better than Solar Pro4?

GPT-5.2 Codex and Solar Pro4 score almost the same on the Noometry Index (42.2 vs 41.5), so choose on price, context window or the category you care about most.

Which is cheaper, GPT-5.2 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-5.2 Codex lists at $1.75 and $14.

Is GPT-5.2 Codex or Solar Pro4 better for coding?

GPT-5.2 Codex scores higher on coding benchmarks: 45.4 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-5.2 Codex and Solar Pro4 share?

1 benchmark has published results for both models. GPT-5.2 Codex has 5 scored results on Noometry and Solar Pro4 has 18.