Noometry

Model comparison

Gemini 3 Flash Preview vs GPT-5.6 Terra

GPT-5.6 Terra is the stronger model overall, scoring 59.2 to 52.3 on the Noometry Index. Gemini 3 Flash Preview costs 4.0× less per token, which makes it the better buy when GPT-5.6 Terra's lead doesn't matter for your workload.

Last verified . 41 shared benchmarks.

Gemini 3 Flash Preview Google

52.3

Rank #40 Confirmed

GPT-5.6 Terra OpenAI

59.2

Rank #17 Confirmed

Summary

  • They share 41 benchmarks with published results for both. Gemini 3 Flash Preview scores higher in 2 categories and GPT-5.6 Terra in 8 categories; 8 gaps are clear of the uncertainty.
  • The widest gap is in math, where GPT-5.6 Terra leads 81.6 to 51.7.
  • The biggest single-benchmark swing is ProofBench: 15% for Gemini 3 Flash Preview and 74% for GPT-5.6 Terra.
  • Gemini 3 Flash Preview is cheaper at $0.50 / $3 per million input/output tokens, against $2 / $12 for GPT-5.6 Terra.
  • GPT-5.6 Terra accepts more context: 1.05M tokens versus 1.05M.

Side by side

Gemini 3 Flash PreviewGPT-5.6 Terra
ProviderGoogleOpenAI
Noometry Index52.359.2
Released2025-12-172026-07-09
WeightsProprietaryProprietary
Context window1.05M1.05M
Max output66K128K
Input $ / M tokens$0.50$2
Output $ / M tokens$3$12
Results tracked5952

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Category by category

Coding GPT-5.6 Terra leads

Gemini 3 Flash Preview: 50.9 (#42), GPT-5.6 Terra: 57.7 (#19)

BenchmarkGemini 3 Flash PreviewGPT-5.6 Terra
LMArena WebDev14391522
WeirdML61.6%78.3%
LMArena Coding14601484
ALE-Bench1,3671,951
SWE-bench Verified75.4%—
DeepSWE—69.6%
FrontierCode—41.3%
SWE-bench Verified (bash only)75.8%—
CursorBench—41.3%
SWE-bench Multilingual72.7%—
SciCode—55%
GSO9.8%—

Agentic & Tool Use GPT-5.6 Terra leads

Gemini 3 Flash Preview: 38.7 (#29), GPT-5.6 Terra: 40.1 (#25)

BenchmarkGemini 3 Flash PreviewGPT-5.6 Terra
BALROG48.1%53.2%
GDP.pdf10%24.7%
Vending-Bench 23,6357,343
Terminal-Bench64.3%—
APEX-Agents—58.2%
τ²-bench Airline82.5%—
τ²-bench Banking27.3%—
τ²-bench Retail76.8%—
τ²-bench Telecom91.2%—
DeepResearch Bench49.8%—
LMArena Search1198—

Reasoning GPT-5.6 Terra leads

Gemini 3 Flash Preview: 49.2 (#37), GPT-5.6 Terra: 60.7 (#21)

BenchmarkGemini 3 Flash PreviewGPT-5.6 Terra
ARC-AGI-233.6%83.9%
SimpleBench61.1%48.9%
NYT Connections (extended)83.1%78.4%
ARC-AGI-184.7%96.5%
Chess Puzzles40%54%
LMArena Hard Prompts14651468
Mystery Game Puzzles26%35%
DTBench89.1%93.3%
LMCA43.1%55%
Epoch Capabilities Index151.8159.62
Kagi LLM Benchmark—51.3%
CritPt—30%
Surface Evolver Bench—83.8%
ForecastBench58.5—

Math GPT-5.6 Terra leads

Gemini 3 Flash Preview: 51.7 (#55), GPT-5.6 Terra: 81.6 (#12)

BenchmarkGemini 3 Flash PreviewGPT-5.6 Terra
FrontierMath (Tiers 1-3)51.2%86%
FrontierMath Tier 417.1%70.7%
OTIS Mock AIME 2024-202595.6%99.7%
ProofBench15%74%
LMArena Math14731466
MathArena Final-Answer Competitions67.6%—
FrontierMath (Feb 2025 set)35.6%—
FrontierMath Tier 4 (v1)4.2%—

Knowledge GPT-5.6 Terra leads

Gemini 3 Flash Preview: 58.8 (#33), GPT-5.6 Terra: 61.2 (#30)

BenchmarkGemini 3 Flash PreviewGPT-5.6 Terra
GPQA Diamond89.4%93.3%
SimpleQA Verified66.8%43.2%
LMArena Expert14621492
Vectara Hallucination Rate13.5%—

Multimodal GPT-5.6 Terra leads

Gemini 3 Flash Preview: 45.5 (#16), GPT-5.6 Terra: 47.3 (#11)

BenchmarkGemini 3 Flash PreviewGPT-5.6 Terra
LMArena Vision12851271
Blueprint-Bench 20%30.8%
LMArena Document14131472
GeoBench88%—
VPCT72.6%—
Furniture Assembly—54.2%

Multilingual Gemini 3 Flash Preview leads

Gemini 3 Flash Preview: 55.7 (#27), GPT-5.6 Terra: 54.4 (#44)

BenchmarkGemini 3 Flash PreviewGPT-5.6 Terra
LMArena Non-English14581439
LMArena Chinese15111513
LMArena French14771471
LMArena German14971460
LMArena Japanese14891457
LMArena Korean14431425
LMArena Russian14801450
LMArena Spanish14691448

Instruction Following Too close to call

Gemini 3 Flash Preview: 75.7 (#56), GPT-5.6 Terra: 76.4 (#40)

BenchmarkGemini 3 Flash PreviewGPT-5.6 Terra
LMArena Instruction Following14371454

Long Context Too close to call

Gemini 3 Flash Preview: 44.4 (#67), GPT-5.6 Terra: 44.4 (#68)

BenchmarkGemini 3 Flash PreviewGPT-5.6 Terra
LMArena Longer Query14521451

Writing & Preference GPT-5.6 Terra leads

Gemini 3 Flash Preview: 65.5 (#45), GPT-5.6 Terra: 70.2 (#23)

BenchmarkGemini 3 Flash PreviewGPT-5.6 Terra
LMArena Text14661447
LMArena Creative Writing14571410
LMArena Multi-Turn14711449
EQ-Bench Creative Writing—1855
EQ-Bench 4—1234

Frequently asked questions

Is Gemini 3 Flash Preview better than GPT-5.6 Terra?

GPT-5.6 Terra is the stronger model overall, scoring 59.2 to 52.3 on the Noometry Index. Gemini 3 Flash Preview costs 4.0× less per token, which makes it the better buy when GPT-5.6 Terra's lead doesn't matter for your workload.

Which is cheaper, Gemini 3 Flash Preview or GPT-5.6 Terra?

Gemini 3 Flash Preview is cheaper. It lists at $0.50 per million input tokens and $3 per million output tokens; GPT-5.6 Terra lists at $2 and $12.

Is Gemini 3 Flash Preview or GPT-5.6 Terra better for coding?

GPT-5.6 Terra scores higher on coding benchmarks: 57.7 versus 50.9 in the Noometry coding category.

Which has the bigger context window?

GPT-5.6 Terra does, with 1.05M tokens against 1.05M.

How many benchmarks do Gemini 3 Flash Preview and GPT-5.6 Terra share?

41 benchmarks have published results for both models. Gemini 3 Flash Preview has 59 scored results on Noometry and GPT-5.6 Terra has 52.

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