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Gemini 3 Flash Preview vs GPT-5.6 Terra

GPT-5.6 Terra leads Gemini 3 Flash Preview on coding, 63.9 to 43.7 on the Vibe Coding Index, and Gemini 3 Flash Preview costs 4.0x less per output token ($3.00 vs $12.00 per million). Updated October 22, 2026; 56 benchmarks have a result for both.

Replace Gemini 3 Flash Preview Replace GPT-5.6 Terra
Gemini 3 Flash PreviewGoogle
Coding
43.7
Overall
55.0
Output $/M
$3.00
14
GPT-5.6 TerraOpenAI
Coding
63.9
Overall
68.1
Output $/M
$12.00
42
vs boards won of 56 shared

Gemini 3 Flash Preview or GPT-5.6 Terra: which to pick

Pick GPT-5.6 Terra for coding: it scores 63.9 on the Vibe Coding Index against 43.7 for Gemini 3 Flash Preview.

Pick Gemini 3 Flash Preview for output tokens 4.0x cheaper ($3.00 vs $12.00 per million) and a lower cost per solved task ($0.37 against $0.42).

Model AGemini 3 Flash PreviewGoogle43.7/1002 independent benchmarks$0.37 per solved taskModel BGPT-5.6 TerraOpenAI63.9/1006 independent benchmarks$0.42 per solved task
Shared results
56
Gemini 3 Flash Preview only
15
GPT-5.6 Terra only
71
Like-for-like categories
8 of 9

Only benchmarks that tested both models count toward a pick; a result only one model has is shown but not compared.

Which one for your work

Each card is decided by one number both models carry. Where only one has it, the card says so and makes no call.

At a glance

Coding index
Gemini 3 Flash Preview 43.7 from 2 benchmarks, GPT-5.6 Terra 63.9 from 6 benchmarks.
Widest category
Math, 37.9 points apart on average over 4 shared benchmarks.
Widest single gap
ProofBench: Gemini 3 Flash Preview 15.0% against GPT-5.6 Terra 74.0%, 59.0 points apart on a 0 to 100 scale.
Output price
Gemini 3 Flash Preview $3.00 against GPT-5.6 Terra $12.00 per million output tokens, 4.0x apart.
Context window
Gemini 3 Flash Preview takes 1.05M tokens, GPT-5.6 Terra 1.05M.

Benchmark by benchmark

First the score: boards each model leads, per category, where both have a result. Then every board, a category to a fold; bars are each result on a 0 to 100 scale, so compare the two in a row, not one row with another.

Boards won, where both have a result
CategoryGemini 3 Flash PreviewBarsGPT-5.6 TerraTies
Coding19
Intelligence01
Agentic work111
Reasoning28
Math04
Knowledge71
Web design13
General25
All shared boards1442
CodingLike-for-likeSix of these boards feed the Vibe Coding Index19
Coding benchmarks for Gemini 3 Flash Preview and GPT-5.6 Terra
BenchmarkGemini 3 Flash PreviewGPT-5.6 TerraLeader
SWE-bench Verified75.8%Not measuredOnly Gemini 3 Flash Preview measured
LiveBench codingNot measured86.2%Only GPT-5.6 Terra measured
LMArena WebDevNot measured1522Only GPT-5.6 Terra measured
AA Coding IndexNot measured76.7Only GPT-5.6 Terra measured
LiveCodeBench (Vals AI)85.6%85.9%GPT-5.6 Terra
SWE-bench Verified (Vals AI)75.0%95.4%GPT-5.6 Terra
Terminal-Bench 4 (Vals AI)Not measured22.7%Only GPT-5.6 Terra measured
Vibe Code Bench (Vals AI)20.2%74.6%GPT-5.6 Terra
Code migration (Vals AI)6.4%47.8%GPT-5.6 Terra
ProgramBench (Vals AI)0.0%0.5%GPT-5.6 Terra
IOI (Vals AI)Not measured87.6%Only GPT-5.6 Terra measured
Terminal-Bench 2.1 (Vals AI)53.9%77.5%GPT-5.6 Terra
Vibe Code Bench 1-100 (Vals AI)Not measured14.8%Only GPT-5.6 Terra measured
SkillsBench (Vals AI)Not measured58.9%Only GPT-5.6 Terra measured
CyberBench (Vals AI)Not measured72.1%Only GPT-5.6 Terra measured
LiveCodeBench (Artificial Analysis run)90.8%Not measuredOnly Gemini 3 Flash Preview measured
SciCodeNot measured55.0%Only GPT-5.6 Terra measured
Terminal-Bench Hard (Artificial Analysis run)38.6%62.9%GPT-5.6 Terra
Terminal-Bench64.3%Not measuredOnly Gemini 3 Flash Preview measured
FrontierCodeNot measured41.3%Only GPT-5.6 Terra measured
GSO-Bench9.8%Not measuredOnly Gemini 3 Flash Preview measured
WeirdML61.6%78.3%GPT-5.6 Terra
ALE-Bench1367.21951.4GPT-5.6 Terra
LMArena Text: codingNot measured1485Only GPT-5.6 Terra measured
LMArena Text: software and ITNot measured1482Only GPT-5.6 Terra measured
LMArena WebDev: ReactNot measured1513Only GPT-5.6 Terra measured
LMArena WebDev: HTMLNot measured1526Only GPT-5.6 Terra measured
LMArena WebDev: from an imageNot measured1541Only GPT-5.6 Terra measured
SciCode12.7%10.8%Gemini 3 Flash Preview
Neither model has a result on the other 10 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01
Intelligence benchmarks for Gemini 3 Flash Preview and GPT-5.6 Terra
BenchmarkGemini 3 Flash PreviewGPT-5.6 TerraLeader
AA Intelligence Index26.342.1GPT-5.6 Terra
Epoch Capabilities IndexNot measured160.1Only GPT-5.6 Terra measured
Agentic workLike-for-likePublic boards, shown as published, kept out of the index111
Agentic work benchmarks for Gemini 3 Flash Preview and GPT-5.6 Terra
BenchmarkGemini 3 Flash PreviewGPT-5.6 TerraLeader
AA Agentic IndexNot measured43.2Only GPT-5.6 Terra measured
Design Arena: agents building web apps11111120GPT-5.6 Terra
Design Arena: agents building full-stack apps10631061Gemini 3 Flash Preview
Design Arena: agents building mobile apps10901111GPT-5.6 Terra
Design Arena: agents building Android apps10511062GPT-5.6 Terra
Design Arena: agents building Godot games1161Not measuredOnly Gemini 3 Flash Preview measured
Design Arena: agents building gamesNot measured1083Only GPT-5.6 Terra measured
Design Arena: HTML slidesNot measured1058Only GPT-5.6 Terra measured
Design Arena: PowerPoint slides10361105GPT-5.6 Terra
LiveBench researchNot measured60.4%Only GPT-5.6 Terra measured
LiveBench browserNot measured84.0%Only GPT-5.6 Terra measured
LiveBench long agenticNot measured48.4%Only GPT-5.6 Terra measured
SREBench (Vals AI)Not measured9.5%Only GPT-5.6 Terra measured
Finance Agent (Vals AI)42.5%54.4%GPT-5.6 Terra
Tax Agent Bench (Vals AI)11.8%30.0%GPT-5.6 Terra
Legal Research Bench (Vals AI)18.3%41.4%GPT-5.6 Terra
Excel Modeling Benchmark (Vals AI)26.0%66.2%GPT-5.6 Terra
Terminal-Bench-Science (Vals AI)Not measured10.0%Only GPT-5.6 Terra measured
τ²-Bench Telecom80.4%86.3%GPT-5.6 Terra
APEX-AgentsNot measured58.2%Only GPT-5.6 Terra measured
BALROG48.1%53.2%GPT-5.6 Terra
DeepResearch Bench49.8%Not measuredOnly Gemini 3 Flash Preview measured
Vending-Bench 2$3,635$7,343GPT-5.6 Terra
Neither model has a result on the other 18 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index28
Reasoning benchmarks for Gemini 3 Flash Preview and GPT-5.6 Terra
BenchmarkGemini 3 Flash PreviewGPT-5.6 TerraLeader
GPQA Diamond87.9%90.9%GPT-5.6 Terra
LiveBench reasoningNot measured90.6%Only GPT-5.6 Terra measured
MMMU Pro (Vals AI)87.6%86.5%Gemini 3 Flash Preview
GPQA Diamond (Artificial Analysis run)89.8%92.5%GPT-5.6 Terra
Humanity's Last Exam (Artificial Analysis run)36.6%42.9%GPT-5.6 Terra
GPQA Diamond (Epoch AI run)89.4%93.3%GPT-5.6 Terra
ARC-AGI84.7%96.5%GPT-5.6 Terra
ARC-AGI-233.6%83.9%GPT-5.6 Terra
SimpleBench61.1%48.9%Gemini 3 Flash Preview
Chess puzzles39.0%47.0%GPT-5.6 Terra
Mystery game puzzles26.0%35.0%GPT-5.6 Terra
VPCT72.6%Not measuredOnly Gemini 3 Flash Preview measured
LMArena Text: hard promptsNot measured1469Only GPT-5.6 Terra measured
LMArena Text: expertNot measured1496Only GPT-5.6 Terra measured
LMArena Text: hard prompts in EnglishNot measured1465Only GPT-5.6 Terra measured
LMArena Vision: diagramsNot measured1295Only GPT-5.6 Terra measured
LMArena Vision: homeworkNot measured1312Only GPT-5.6 Terra measured
Kagi LLM BenchmarkNot measured51.3%Only GPT-5.6 Terra measured
Neither model has a result on the other 4 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index04
Math benchmarks for Gemini 3 Flash Preview and GPT-5.6 Terra
BenchmarkGemini 3 Flash PreviewGPT-5.6 TerraLeader
AIME95.6%Not measuredOnly Gemini 3 Flash Preview measured
MGSM (Vals AI)93.3%Not measuredOnly Gemini 3 Flash Preview measured
AA Math Index97.0Not measuredOnly Gemini 3 Flash Preview measured
AIME 2025 (Artificial Analysis run)97.0%Not measuredOnly Gemini 3 Flash Preview measured
OTIS Mock AIME95.6%99.7%GPT-5.6 Terra
FrontierMath, tiers 1 to 351.2%86.0%GPT-5.6 Terra
FrontierMath, tier 417.1%70.7%GPT-5.6 Terra
ProofBench15.0%74.0%GPT-5.6 Terra
LMArena Text: mathNot measured1465Only GPT-5.6 Terra measured
LMArena Text: mathematical workNot measured1478Only GPT-5.6 Terra measured
Neither model has a result on the other 3 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index71
Knowledge benchmarks for Gemini 3 Flash Preview and GPT-5.6 Terra
BenchmarkGemini 3 Flash PreviewGPT-5.6 TerraLeader
MMLU Pro88.6%86.7%Gemini 3 Flash Preview
LegalBench (Vals AI)86.9%85.1%Gemini 3 Flash Preview
CaseLaw (Vals AI)55.8%Not measuredOnly Gemini 3 Flash Preview measured
CorpFin (Vals AI)66.4%65.3%Gemini 3 Flash Preview
TaxEval (Vals AI)73.9%76.2%GPT-5.6 Terra
MortgageTax (Vals AI)68.7%67.3%Gemini 3 Flash Preview
MedQA (Vals AI)95.8%Not measuredOnly Gemini 3 Flash Preview measured
MedCode (Vals AI)55.9%43.4%Gemini 3 Flash Preview
MMLU Pro (Artificial Analysis run)89.0%Not measuredOnly Gemini 3 Flash Preview measured
SimpleQA Verified66.8%43.2%Gemini 3 Flash Preview
GeoBench88.0%Not measuredOnly Gemini 3 Flash Preview measured
LMArena Text: scienceNot measured1452Only GPT-5.6 Terra measured
LMArena Text: medicine and healthcareNot measured1430Only GPT-5.6 Terra measured
LMArena Text: legal and governmentNot measured1461Only GPT-5.6 Terra measured
LMArena Text: business and financeNot measured1448Only GPT-5.6 Terra measured
FACTS Benchmark Suite63.4%52.0%Gemini 3 Flash Preview
Neither model has a result on the other 2 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index13
Web design benchmarks for Gemini 3 Flash Preview and GPT-5.6 Terra
BenchmarkGemini 3 Flash PreviewGPT-5.6 TerraLeader
Design Arena: websites11961268GPT-5.6 Terra
Design Arena: UI componentsNot measured1256Only GPT-5.6 Terra measured
Design Arena: game dev11661229GPT-5.6 Terra
Design Arena: data vizNot measured1240Only GPT-5.6 Terra measured
Design Arena: 3D11831134Gemini 3 Flash Preview
Design Arena: all code categories11891241GPT-5.6 Terra
Design Arena: SVGNot measured1219Only GPT-5.6 Terra measured
Design Arena: ASCII artNot measured1177Only GPT-5.6 Terra measured
LiveBench designNot measured76.0%Only GPT-5.6 Terra measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index25
General benchmarks for Gemini 3 Flash Preview and GPT-5.6 Terra
BenchmarkGemini 3 Flash PreviewGPT-5.6 TerraLeader
LiveBench data analysisNot measured79.3%Only GPT-5.6 Terra measured
Public Benefits Bench (Vals AI)Not measured62.4%Only GPT-5.6 Terra measured
SAGE (Vals AI)51.8%47.0%Gemini 3 Flash Preview
MedScribe (Vals AI)69.9%82.9%GPT-5.6 Terra
Vals Multimodal Index52.2%65.1%GPT-5.6 Terra
IFBench78.0%71.2%Gemini 3 Flash Preview
Long context reasoning (AA-LCR)78.0%83.0%GPT-5.6 Terra
DTBench89.1%93.3%GPT-5.6 Terra
LMCA43.1%54.9%GPT-5.6 Terra
Surface Evolver BenchNot measured83.8%Only GPT-5.6 Terra measured
Furniture assemblyNot measured54.2%Only GPT-5.6 Terra measured
LMArena TextNot measured1448Only GPT-5.6 Terra measured
LMArena Text: instruction followingNot measured1456Only GPT-5.6 Terra measured
LMArena Text: creative writingNot measured1413Only GPT-5.6 Terra measured
LMArena VisionNot measured1271Only GPT-5.6 Terra measured
LMArena Text: EnglishNot measured1449Only GPT-5.6 Terra measured
LMArena Text: non-EnglishNot measured1441Only GPT-5.6 Terra measured
LMArena Text: ChineseNot measured1514Only GPT-5.6 Terra measured
LMArena Text: GermanNot measured1460Only GPT-5.6 Terra measured
LMArena Text: JapaneseNot measured1454Only GPT-5.6 Terra measured
LMArena Text: KoreanNot measured1427Only GPT-5.6 Terra measured
LMArena Text: FrenchNot measured1466Only GPT-5.6 Terra measured
LMArena Text: SpanishNot measured1451Only GPT-5.6 Terra measured
LMArena Text: RussianNot measured1452Only GPT-5.6 Terra measured
LMArena Text: PolishNot measured1446Only GPT-5.6 Terra measured
LMArena Text: multi-turnNot measured1453Only GPT-5.6 Terra measured
LMArena Text: longer queriesNot measured1454Only GPT-5.6 Terra measured
LMArena Text: writing and languageNot measured1431Only GPT-5.6 Terra measured
LMArena Text: entertainment and mediaNot measured1418Only GPT-5.6 Terra measured
LMArena Vision: EnglishNot measured1272Only GPT-5.6 Terra measured
LMArena Vision: ChineseNot measured1337Only GPT-5.6 Terra measured
LMArena Vision: reading textNot measured1278Only GPT-5.6 Terra measured
LMArena Vision: humorNot measured1236Only GPT-5.6 Terra measured
LMArena Vision: creative writingNot measured1248Only GPT-5.6 Terra measured
LMArena DocumentNot measured1472Only GPT-5.6 Terra measured
Neither model has a result on the other 11 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Gemini 3 Flash Preview and GPT-5.6 Terra
BenchmarkGemini 3 Flash PreviewGPT-5.6 TerraLeader
Neither model has a result on 5 boards here

What each workload costs

Three fixed token mixes at each model's listed price, so per-token rates become a bill.

Chat turn

1K input + 500 output tokens

Gemini 3 Flash Preview$0.0020Fits in one request
GPT-5.6 Terra$0.0080Fits in one request

Gemini 3 Flash Preview costs less

Repository review

50K input + 3K output tokens

Gemini 3 Flash Preview$0.034Fits in one request
GPT-5.6 Terra$0.136Fits in one request

Gemini 3 Flash Preview costs less

Agent loop

200K input + 10K output tokens

Gemini 3 Flash Preview$0.130Fits in one request
GPT-5.6 Terra$0.520Fits in one request

Gemini 3 Flash Preview costs less

Listed OpenRouter rates, without cache or batch discounts. A workload that does not fit a model's context window would need splitting.

Specification differences

The leading value in a row is marked; a row with a missing value names no leader. Our two rows are marked in red.

Specifications of Gemini 3 Flash Preview and GPT-5.6 Terra
SpecificationGoogle Gemini 3 Flash PreviewOpenAI GPT-5.6 Terra
MakerGoogleOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedDecember 17, 2025July 9, 2026
Context window1.05M1.05M
Input $/Mtok$0.50$2.00
Output $/Mtok$3.00$12.00
Coding index43.763.9
Independent measurements behind it26
Cost per solved task$0.37$0.42
SourceOpenRouter listingOpenRouter listing

Questions

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

Pick GPT-5.6 Terra for coding: it scores 63.9 on the Vibe Coding Index against 43.7 for Gemini 3 Flash Preview. Pick Gemini 3 Flash Preview for output tokens 4.0x cheaper ($3.00 vs $12.00 per million) and a lower cost per solved task ($0.37 against $0.42).

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

Gemini 3 Flash Preview costs $0.50 per million input tokens and $3.00 per million output tokens; GPT-5.6 Terra costs $2.00 and $12.00. Per solved SWE-bench Verified task, Gemini 3 Flash Preview costs $0.37 and GPT-5.6 Terra $0.42.

Which has the bigger context window, Gemini 3 Flash Preview or GPT-5.6 Terra?

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

How many benchmarks is the Gemini 3 Flash Preview vs GPT-5.6 Terra comparison based on?

56 benchmarks have a result for both models as of October 22, 2026. Gemini 3 Flash Preview's coding index rests on 2 independent benchmarks and GPT-5.6 Terra's on 6. Where only one model has a result, the page says so instead of naming a winner.

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<p style="font:13px/1.4 sans-serif;margin:6px 0 0">Source: <a href="https://llmbenchmark.ai/compare/gemini-3-flash-preview-vs-gpt-5-6-terra">LLMBenchmark.ai, Gemini 3 Flash Preview vs GPT-5.6 Terra</a></p>