Noometry

Model comparison

Gemini 3.5 Flash vs GPT-6.1 Sol

Gemini 3.5 Flash has enough public results to be ranked (#29); GPT-6.1 Sol does not yet, so treat this comparison as directional.

Last verified . 2 shared benchmarks.

Gemini 3.5 Flash Google

54.1

Rank #29 Confirmed

GPT-6.1 Sol OpenAI

42.1

Unranked Sparse

Summary

  • They share 2 benchmarks with published results for both. Gemini 3.5 Flash scores higher in 0 categories and GPT-6.1 Sol in 2 categories; 2 gaps are clear of the uncertainty.
  • The widest gap is in agentic & tool use, where GPT-6.1 Sol leads 34.3 to 24.8.
  • The biggest single-benchmark swing is DeepSWE: 37.4% for Gemini 3.5 Flash and 75.2% for GPT-6.1 Sol.
  • Gemini 3.5 Flash is cheaper at $1.50 / $9 per million input/output tokens, against $2 / $10 for GPT-6.1 Sol.
  • GPT-6.1 Sol accepts more context: 1.05M tokens versus 1.05M.

Side by side

Gemini 3.5 FlashGPT-6.1 Sol
ProviderGoogleOpenAI
Noometry Index54.142.1
Released2026-05-192026-09-29
WeightsProprietaryProprietary
Context window1.05M1.05M
Max output66K128K
Input $ / M tokens$1.50$2
Output $ / M tokens$9$10
Results tracked542

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Category by category

Coding GPT-6.1 Sol leads

Gemini 3.5 Flash: 49.1 (#46), GPT-6.1 Sol: 51.4

BenchmarkGemini 3.5 FlashGPT-6.1 Sol
DeepSWE37.4%75.2%
SWE-bench Verified79.3%—
LMArena WebDev1499—
SciCode53.1%—
WeirdML62.6%—
LMArena Coding1492—
ALE-Bench911.02—

Agentic & Tool Use GPT-6.1 Sol leads

Gemini 3.5 Flash: 24.8 (#107), GPT-6.1 Sol: 34.3

BenchmarkGemini 3.5 FlashGPT-6.1 Sol
GDP.pdf14%32%
APEX-Agents27.5%—
GBAEval6.7%—
Vending-Bench 25,396—

Reasoning Not comparable

Gemini 3.5 Flash: 62.7 (#16), GPT-6.1 Sol: —

BenchmarkGemini 3.5 FlashGPT-6.1 Sol
ARC-AGI-272.1%—
SimpleBench76.7%—
NYT Connections (extended)92.6%—
ARC-AGI-192.5%—
CritPt13.1%—
Chess Puzzles50%—
EnigmaEval25.4%—
EBR-Bench4.8%—
LMArena Hard Prompts1488—
Mystery Game Puzzles32%—
DTBench94.7%—
LMCA47.1%—
Surface Evolver Bench58.1%—
Epoch Capabilities Index154.55—
ForecastBench59—

Math Not comparable

Gemini 3.5 Flash: 60.5 (#30), GPT-6.1 Sol: —

BenchmarkGemini 3.5 FlashGPT-6.1 Sol
FrontierMath (Tiers 1-3)62.8%—
FrontierMath Tier 426.8%—
MathArena Final-Answer Competitions76.3%—
OTIS Mock AIME 2024-202595.6%—
ProofBench31%—
LMArena Math1502—
FrontierMath (Feb 2025 set)39%—
FrontierMath Tier 4 (v1)14.6%—

Knowledge Not comparable

Gemini 3.5 Flash: 66.3 (#10), GPT-6.1 Sol: —

BenchmarkGemini 3.5 FlashGPT-6.1 Sol
GPQA Diamond92.8%—
SimpleQA Verified66.2%—
LMArena Expert1493—

Multimodal Not comparable

Gemini 3.5 Flash: 45.7 (#13), GPT-6.1 Sol: —

BenchmarkGemini 3.5 FlashGPT-6.1 Sol
LMArena Vision1311—
Blueprint-Bench 233.6%—
LMArena Document1463—

Multilingual Not comparable

Gemini 3.5 Flash: 57.1 (#12), GPT-6.1 Sol: —

BenchmarkGemini 3.5 FlashGPT-6.1 Sol
LMArena Non-English1475—
LMArena Chinese1525—
LMArena French1490—
LMArena German1500—
LMArena Japanese1481—
LMArena Korean1453—
LMArena Russian1491—
LMArena Spanish1478—

Instruction Following Not comparable

Gemini 3.5 Flash: 77.2 (#29), GPT-6.1 Sol: —

BenchmarkGemini 3.5 FlashGPT-6.1 Sol
LMArena Instruction Following1466—

Long Context Not comparable

Gemini 3.5 Flash: 45.3 (#39), GPT-6.1 Sol: —

BenchmarkGemini 3.5 FlashGPT-6.1 Sol
LMArena Longer Query1481—

Writing & Preference Not comparable

Gemini 3.5 Flash: 65.5 (#46), GPT-6.1 Sol: —

BenchmarkGemini 3.5 FlashGPT-6.1 Sol
LMArena Text1481—
LMArena Creative Writing1467—
EQ-Bench 41087—
LMArena Multi-Turn1482—

Frequently asked questions

Is Gemini 3.5 Flash better than GPT-6.1 Sol?

Gemini 3.5 Flash has enough public results to be ranked (#29); GPT-6.1 Sol does not yet, so treat this comparison as directional.

Which is cheaper, Gemini 3.5 Flash or GPT-6.1 Sol?

Gemini 3.5 Flash is cheaper. It lists at $1.50 per million input tokens and $9 per million output tokens; GPT-6.1 Sol lists at $2 and $10.

Is Gemini 3.5 Flash or GPT-6.1 Sol better for coding?

GPT-6.1 Sol scores higher on coding benchmarks: 51.4 versus 49.1 in the Noometry coding category.

Which has the bigger context window?

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

How many benchmarks do Gemini 3.5 Flash and GPT-6.1 Sol share?

2 benchmarks have published results for both models. Gemini 3.5 Flash has 54 scored results on Noometry and GPT-6.1 Sol has 2.

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