Noometry

Model comparison

GPT-6.1 Sol vs Solar Pro4

GPT-6.1 Sol is the stronger model overall, scoring 65.6 to 42.1 on the Noometry Index. Solar Pro4 costs 7.6× less per token, which makes it the better buy when GPT-6.1 Sol's lead doesn't matter for your workload.

Last verified . 13 shared benchmarks.

GPT-6.1 Sol OpenAI

65.6

Rank #6 Confirmed

Solar Pro4 Upstage

42.1

Rank #121 Confirmed

Summary

  • They share 13 benchmarks with published results for both. GPT-6.1 Sol scores higher in 8 categories and Solar Pro4 in 0 categories; 8 gaps are clear of the uncertainty.
  • The widest gap is in math, where GPT-6.1 Sol leads 93.7 to 38.8.
  • Solar Pro4 is cheaper at $0.30 / $1.20 per million input/output tokens, against $2 / $10 for GPT-6.1 Sol.
  • GPT-6.1 Sol accepts more context: 1.05M tokens versus 524K.

Side by side

GPT-6.1 SolSolar Pro4
ProviderOpenAIUpstage
Noometry Index65.642.1
Released2026-09-292026-08-06
WeightsProprietaryProprietary
Context window1.05M524K
Max output128K131K
Input $ / M tokens$2$0.30
Output $ / M tokens$10$1.20
Results tracked3418

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Category by category

Coding GPT-6.1 Sol leads

GPT-6.1 Sol: 63.2 (#8), Solar Pro4: 40.1 (#149)

BenchmarkGPT-6.1 SolSolar Pro4
LMArena WebDev17551371
LMArena Coding14871437
DeepSWE75.2%—
FrontierCode50.2%—
SciCode55.8%—

Agentic & Tool Use Not comparable

GPT-6.1 Sol: 39.6 (#26), Solar Pro4: —

BenchmarkGPT-6.1 SolSolar Pro4
APEX-Agents60%—
GDP.pdf32%—

Reasoning GPT-6.1 Sol leads

GPT-6.1 Sol: 81.9 (#2), Solar Pro4: 28.5 (#104)

BenchmarkGPT-6.1 SolSolar Pro4
LMArena Hard Prompts14661399
ARC-AGI-294.2%—
NYT Connections (extended)95.5%—
ARC-AGI-198.5%—
CritPt31.7%—
Chess Puzzles61%—
EBR-Bench54.3%—
Mystery Game Puzzles80%—
Epoch Capabilities Index166.09—

Math GPT-6.1 Sol leads

GPT-6.1 Sol: 93.7 (#1), Solar Pro4: 38.8 (#128)

BenchmarkGPT-6.1 SolSolar Pro4
LMArena Math14641416
FrontierMath (Tiers 1-3)93.7%—
FrontierMath Tier 4100%—
OTIS Mock AIME 2024-2025100%—
ProofBench99%—

Knowledge GPT-6.1 Sol leads

GPT-6.1 Sol: 71.8 (#4), Solar Pro4: 39.8 (#129)

BenchmarkGPT-6.1 SolSolar Pro4
LMArena Expert15021427
GPQA Diamond95.4%—
SimpleQA Verified73.9%—

Multimodal Not comparable

GPT-6.1 Sol: 52.7 (#5), Solar Pro4: —

BenchmarkGPT-6.1 SolSolar Pro4
LMArena Vision1288—
Furniture Assembly80%—

Multilingual GPT-6.1 Sol leads

GPT-6.1 Sol: 54.3 (#46), Solar Pro4: 48.7 (#139)

BenchmarkGPT-6.1 SolSolar Pro4
LMArena Non-English14381361
LMArena Chinese14771415
LMArena Russian14551360
LMArena French—1397
LMArena German—1364
LMArena Japanese—1309
LMArena Korean—1382
LMArena Spanish—1401

Instruction Following GPT-6.1 Sol leads

GPT-6.1 Sol: 77.0 (#29), Solar Pro4: 72.7 (#132)

BenchmarkGPT-6.1 SolSolar Pro4
LMArena Instruction Following14681377

Long Context GPT-6.1 Sol leads

GPT-6.1 Sol: 44.9 (#54), Solar Pro4: 42.1 (#130)

BenchmarkGPT-6.1 SolSolar Pro4
LMArena Longer Query14651381

Writing & Preference GPT-6.1 Sol leads

GPT-6.1 Sol: 63.6 (#63), Solar Pro4: 56.5 (#138)

BenchmarkGPT-6.1 SolSolar Pro4
LMArena Text14471386
LMArena Creative Writing14321316
LMArena Multi-Turn14491385

Frequently asked questions

Is GPT-6.1 Sol better than Solar Pro4?

GPT-6.1 Sol is the stronger model overall, scoring 65.6 to 42.1 on the Noometry Index. Solar Pro4 costs 7.6× less per token, which makes it the better buy when GPT-6.1 Sol's lead doesn't matter for your workload.

Which is cheaper, GPT-6.1 Sol or Solar Pro4?

Solar Pro4 is cheaper. It lists at $0.30 per million input tokens and $1.20 per million output tokens; GPT-6.1 Sol lists at $2 and $10.

Is GPT-6.1 Sol or Solar Pro4 better for coding?

GPT-6.1 Sol scores higher on coding benchmarks: 63.2 versus 40.1 in the Noometry coding category.

Which has the bigger context window?

GPT-6.1 Sol does, with 1.05M tokens against 524K.

How many benchmarks do GPT-6.1 Sol and Solar Pro4 share?

13 benchmarks have published results for both models. GPT-6.1 Sol has 34 scored results on Noometry and Solar Pro4 has 18.

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