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Gemini 3.5 Flash Lite vs GPT-5.6 Terra

GPT-5.6 Terra leads Gemini 3.5 Flash Lite on coding, 63.9 to 49.0 on the Vibe Coding Index, and Gemini 3.5 Flash Lite costs 4.8x less per output token ($2.50 vs $12.00 per million). Updated October 22, 2026; 85 benchmarks have a result for both.

Replace Gemini 3.5 Flash Lite Replace GPT-5.6 Terra
Gemini 3.5 Flash LiteGoogle
Coding
49.0
Overall
49.8
Output $/M
$2.50
9
GPT-5.6 TerraOpenAI
Coding
63.9
Overall
68.1
Output $/M
$12.00
76
vs boards won of 85 shared

Gemini 3.5 Flash Lite 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 49.0 for Gemini 3.5 Flash Lite.

Pick Gemini 3.5 Flash Lite for output tokens 4.8x cheaper ($2.50 vs $12.00 per million) and a lower cost per solved task ($0.41 against $0.42).

Model AGemini 3.5 Flash LiteGoogle49.0/1003 independent benchmarks$0.41 per solved taskModel BGPT-5.6 TerraOpenAI63.9/1006 independent benchmarks$0.42 per solved task
Shared results
85
Gemini 3.5 Flash Lite only
0
GPT-5.6 Terra only
42
Like-for-like categories
7 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 3.5 Flash Lite 49.0 from 3 benchmarks, GPT-5.6 Terra 63.9 from 6 benchmarks.
Widest category
Math, 38.8 points apart on average over 6 shared benchmarks.
Widest single gap
ARC-AGI-2: Gemini 3.5 Flash Lite 10.3% against GPT-5.6 Terra 83.9%, 73.6 points apart on a 0 to 100 scale.
Output price
Gemini 3.5 Flash Lite $2.50 against GPT-5.6 Terra $12.00 per million output tokens, 4.8x apart.
Context window
Gemini 3.5 Flash Lite 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 3.5 Flash LiteBarsGPT-5.6 TerraTies
Coding017
Intelligence02
Agentic work06
Reasoning014
Math06
Knowledge47
General524
All shared boards976
CodingLike-for-likeSix of these boards feed the Vibe Coding Index017
Coding benchmarks for Gemini 3.5 Flash Lite and GPT-5.6 Terra
BenchmarkGemini 3.5 Flash LiteGPT-5.6 TerraLeader
LiveBench codingNot measured86.2%Only GPT-5.6 Terra measured
LMArena WebDev14351522GPT-5.6 Terra
AA Coding Index49.376.7GPT-5.6 Terra
LiveCodeBench (Vals AI)79.0%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)37.2%74.6%GPT-5.6 Terra
Code migration (Vals AI)6.2%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)50.2%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)59.1%72.1%GPT-5.6 Terra
SciCode41.3%55.0%GPT-5.6 Terra
Terminal-Bench Hard (Artificial Analysis run)Not measured62.9%Only GPT-5.6 Terra measured
FrontierCodeNot measured41.3%Only GPT-5.6 Terra measured
WeirdML39.0%78.3%GPT-5.6 Terra
ALE-Bench765.31951.4GPT-5.6 Terra
LMArena Text: coding14531485GPT-5.6 Terra
LMArena Text: software and IT14511482GPT-5.6 Terra
LMArena WebDev: React14081513GPT-5.6 Terra
LMArena WebDev: HTMLNot measured1526Only GPT-5.6 Terra measured
LMArena WebDev: from an image14481541GPT-5.6 Terra
SciCode6.2%10.8%GPT-5.6 Terra
Neither model has a result on the other 14 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
Intelligence benchmarks for Gemini 3.5 Flash Lite and GPT-5.6 Terra
BenchmarkGemini 3.5 Flash LiteGPT-5.6 TerraLeader
AA Intelligence Index22.242.1GPT-5.6 Terra
Epoch Capabilities Index144.9160.1GPT-5.6 Terra
Agentic workLike-for-likePublic boards, shown as published, kept out of the index06
Agentic work benchmarks for Gemini 3.5 Flash Lite and GPT-5.6 Terra
BenchmarkGemini 3.5 Flash LiteGPT-5.6 TerraLeader
AA Agentic Index14.343.2GPT-5.6 Terra
Design Arena: agents building web appsNot measured1120Only GPT-5.6 Terra measured
Design Arena: agents building full-stack appsNot measured1061Only GPT-5.6 Terra measured
Design Arena: agents building mobile appsNot measured1111Only GPT-5.6 Terra measured
Design Arena: agents building Android appsNot measured1062Only GPT-5.6 Terra 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 slidesNot measured1105Only GPT-5.6 Terra measured
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)47.4%54.4%GPT-5.6 Terra
Tax Agent Bench (Vals AI)7.2%30.0%GPT-5.6 Terra
Legal Research Bench (Vals AI)13.9%41.4%GPT-5.6 Terra
Excel Modeling Benchmark (Vals AI)43.2%66.2%GPT-5.6 Terra
Terminal-Bench-Science (Vals AI)Not measured10.0%Only GPT-5.6 Terra measured
τ²-Bench TelecomNot measured86.3%Only GPT-5.6 Terra measured
APEX-Agents29.3%58.2%GPT-5.6 Terra
BALROGNot measured53.2%Only GPT-5.6 Terra measured
Vending-Bench 2Not measured$7,343Only GPT-5.6 Terra measured
Neither model has a result on the other 20 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index014
Reasoning benchmarks for Gemini 3.5 Flash Lite and GPT-5.6 Terra
BenchmarkGemini 3.5 Flash LiteGPT-5.6 TerraLeader
GPQA Diamond83.8%90.9%GPT-5.6 Terra
LiveBench reasoningNot measured90.6%Only GPT-5.6 Terra measured
MMMU Pro (Vals AI)83.6%86.5%GPT-5.6 Terra
GPQA Diamond (Artificial Analysis run)83.8%92.5%GPT-5.6 Terra
Humanity's Last Exam (Artificial Analysis run)18.8%42.9%GPT-5.6 Terra
GPQA Diamond (Epoch AI run)83.3%93.3%GPT-5.6 Terra
ARC-AGI53.5%96.5%GPT-5.6 Terra
ARC-AGI-210.3%83.9%GPT-5.6 Terra
SimpleBenchNot measured48.9%Only GPT-5.6 Terra measured
Chess puzzles21.0%47.0%GPT-5.6 Terra
Mystery game puzzles19.0%35.0%GPT-5.6 Terra
LMArena Text: hard prompts14411469GPT-5.6 Terra
LMArena Text: expert14341496GPT-5.6 Terra
LMArena Text: hard prompts in English14401465GPT-5.6 Terra
LMArena Vision: diagrams12841295GPT-5.6 Terra
LMArena Vision: homework12911312GPT-5.6 Terra
Kagi LLM BenchmarkNot measured51.3%Only GPT-5.6 Terra measured
Neither model has a result on the other 5 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index06
Math benchmarks for Gemini 3.5 Flash Lite and GPT-5.6 Terra
BenchmarkGemini 3.5 Flash LiteGPT-5.6 TerraLeader
OTIS Mock AIME71.1%99.7%GPT-5.6 Terra
FrontierMath, tiers 1 to 326.0%86.0%GPT-5.6 Terra
FrontierMath, tier 40.0%70.7%GPT-5.6 Terra
ProofBench13.0%74.0%GPT-5.6 Terra
LMArena Text: math14341465GPT-5.6 Terra
LMArena Text: mathematical work14331478GPT-5.6 Terra
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index47
Knowledge benchmarks for Gemini 3.5 Flash Lite and GPT-5.6 Terra
BenchmarkGemini 3.5 Flash LiteGPT-5.6 TerraLeader
MMLU Pro85.8%86.7%GPT-5.6 Terra
LegalBench (Vals AI)84.1%85.1%GPT-5.6 Terra
CorpFin (Vals AI)60.7%65.3%GPT-5.6 Terra
TaxEval (Vals AI)72.6%76.2%GPT-5.6 Terra
MortgageTax (Vals AI)68.7%67.3%Gemini 3.5 Flash Lite
MedCode (Vals AI)43.5%43.4%Gemini 3.5 Flash Lite
SimpleQA VerifiedNot measured43.2%Only GPT-5.6 Terra measured
LMArena Text: science14511452GPT-5.6 Terra
LMArena Text: medicine and healthcare14381430Gemini 3.5 Flash Lite
LMArena Text: legal and government14311461GPT-5.6 Terra
LMArena Text: business and finance14231448GPT-5.6 Terra
FACTS Benchmark Suite53.5%52.0%Gemini 3.5 Flash Lite
Neither model has a result on the other 6 boards here
Web designDirectional onlyPublic boards, shown as published, kept out of the index9 boards, none shared
Web design benchmarks for Gemini 3.5 Flash Lite and GPT-5.6 Terra
BenchmarkGemini 3.5 Flash LiteGPT-5.6 TerraLeader
Design Arena: websitesNot measured1268Only GPT-5.6 Terra measured
Design Arena: UI componentsNot measured1256Only GPT-5.6 Terra measured
Design Arena: game devNot measured1229Only GPT-5.6 Terra measured
Design Arena: data vizNot measured1240Only GPT-5.6 Terra measured
Design Arena: 3DNot measured1134Only GPT-5.6 Terra measured
Design Arena: all code categoriesNot measured1241Only GPT-5.6 Terra measured
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 index524
General benchmarks for Gemini 3.5 Flash Lite and GPT-5.6 Terra
BenchmarkGemini 3.5 Flash LiteGPT-5.6 TerraLeader
LiveBench data analysisNot measured79.3%Only GPT-5.6 Terra measured
Public Benefits Bench (Vals AI)51.8%62.4%GPT-5.6 Terra
SAGE (Vals AI)47.3%47.0%Gemini 3.5 Flash Lite
MedScribe (Vals AI)70.9%82.9%GPT-5.6 Terra
Vals Multimodal IndexNot measured65.1%Only GPT-5.6 Terra measured
IFBenchNot measured71.2%Only GPT-5.6 Terra measured
Long context reasoning (AA-LCR)76.0%83.0%GPT-5.6 Terra
DTBench83.5%93.3%GPT-5.6 Terra
LMCA37.6%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 Text14351448GPT-5.6 Terra
LMArena Text: instruction following14191456GPT-5.6 Terra
LMArena Text: creative writing14211413Gemini 3.5 Flash Lite
LMArena Vision12691271GPT-5.6 Terra
LMArena Text: English14381449GPT-5.6 Terra
LMArena Text: non-English14271441GPT-5.6 Terra
LMArena Text: Chinese14681514GPT-5.6 Terra
LMArena Text: German14541460GPT-5.6 Terra
LMArena Text: Japanese14261454GPT-5.6 Terra
LMArena Text: Korean14071427GPT-5.6 Terra
LMArena Text: French14511466GPT-5.6 Terra
LMArena Text: Spanish14411451GPT-5.6 Terra
LMArena Text: Russian14431452GPT-5.6 Terra
LMArena Text: Polish14371446GPT-5.6 Terra
LMArena Text: multi-turn14451453GPT-5.6 Terra
LMArena Text: longer queries14351454GPT-5.6 Terra
LMArena Text: writing and language14281431GPT-5.6 Terra
LMArena Text: entertainment and media14141418GPT-5.6 Terra
LMArena Vision: English12691272GPT-5.6 Terra
LMArena Vision: Chinese13111337GPT-5.6 Terra
LMArena Vision: reading text12801278Gemini 3.5 Flash Lite
LMArena Vision: humor12871236Gemini 3.5 Flash Lite
LMArena Vision: creative writing12601248Gemini 3.5 Flash Lite
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 3.5 Flash Lite and GPT-5.6 Terra
BenchmarkGemini 3.5 Flash LiteGPT-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 3.5 Flash Lite$0.0015Fits in one request
GPT-5.6 Terra$0.0080Fits in one request

Gemini 3.5 Flash Lite costs less

Repository review

50K input + 3K output tokens

Gemini 3.5 Flash Lite$0.022Fits in one request
GPT-5.6 Terra$0.136Fits in one request

Gemini 3.5 Flash Lite costs less

Agent loop

200K input + 10K output tokens

Gemini 3.5 Flash Lite$0.085Fits in one request
GPT-5.6 Terra$0.520Fits in one request

Gemini 3.5 Flash Lite 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 3.5 Flash Lite and GPT-5.6 Terra
SpecificationGoogle Gemini 3.5 Flash LiteOpenAI GPT-5.6 Terra
MakerGoogleOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedJuly 21, 2026July 9, 2026
Context window1.05M1.05M
Input $/Mtok$0.30$2.00
Output $/Mtok$2.50$12.00
Coding index49.063.9
Independent measurements behind it36
Cost per solved task$0.41$0.42
SourceOpenRouter listingOpenRouter listing

Questions

Is Gemini 3.5 Flash Lite 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 49.0 for Gemini 3.5 Flash Lite. Pick Gemini 3.5 Flash Lite for output tokens 4.8x cheaper ($2.50 vs $12.00 per million) and a lower cost per solved task ($0.41 against $0.42).

Which is cheaper, Gemini 3.5 Flash Lite or GPT-5.6 Terra?

Gemini 3.5 Flash Lite costs $0.30 per million input tokens and $2.50 per million output tokens; GPT-5.6 Terra costs $2.00 and $12.00. Per solved SWE-bench Verified task, Gemini 3.5 Flash Lite costs $0.41 and GPT-5.6 Terra $0.42.

Which has the bigger context window, Gemini 3.5 Flash Lite or GPT-5.6 Terra?

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

How many benchmarks is the Gemini 3.5 Flash Lite vs GPT-5.6 Terra comparison based on?

85 benchmarks have a result for both models as of October 22, 2026. Gemini 3.5 Flash Lite's coding index rests on 3 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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