Enter opens the highlighted result. Esc closes.

Gemini 4 Carbon vs GPT-5.6 Terra

Gemini 4 Carbon leads GPT-5.6 Terra on coding, 86.6 to 63.5 on the Vibe Coding Index, and Gemini 4 Carbon costs 1.2x less per output token ($10.00 vs $12.00 per million). Updated November 14, 2026; 67 benchmarks have a result for both.

Replace Gemini 4 Carbon Replace GPT-5.6 Terra
Gemini 4 CarbonGoogle
Coding
86.6
Overall
88.3
Output $/M
$10.00
65
GPT-5.6 TerraOpenAI
Coding
63.5
Overall
65.1
Output $/M
$12.00
1
vs boards won of 67 shared, 1 tied

Gemini 4 Carbon or GPT-5.6 Terra: which to pick

Pick Gemini 4 Carbon for coding: it scores 86.6 on the Vibe Coding Index against 63.5 for GPT-5.6 Terra, though on 4 benchmarks against 6.

Pick GPT-5.6 Terra for a larger context window (1.05M against 1.05M tokens) and work measured by Long context reasoning (AA-LCR), where it leads.

Model AGemini 4 CarbonGoogle86.6/1004 independent benchmarksNo cost per solved taskModel BGPT-5.6 TerraOpenAI63.5/1006 independent benchmarks$0.42 per solved task
Shared results
67
Gemini 4 Carbon only
6
GPT-5.6 Terra only
75
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 4 Carbon 86.6 from 4 benchmarks, GPT-5.6 Terra 63.5 from 6 benchmarks.
Widest category
Agentic work, 26.3 points apart on average over 9 shared benchmarks.
Widest single gap
Vending-Bench 2: Gemini 4 Carbon $16,484 against GPT-5.6 Terra $7,343, 54.1 points apart on a 0 to 100 scale.
Output price
Gemini 4 Carbon $10.00 against GPT-5.6 Terra $12.00 per million output tokens, 1.2x apart.
Context window
Gemini 4 Carbon 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 4 CarbonBarsGPT-5.6 TerraTies
Coding120
Intelligence20
Agentic work90
Reasoning1101 tie
Math40
Knowledge70
Web design60
General141
All shared boards6511 tie
CodingLike-for-likeSix of these boards feed the Vibe Coding Index120
Coding benchmarks for Gemini 4 Carbon and GPT-5.6 Terra
BenchmarkGemini 4 CarbonGPT-5.6 TerraLeader
LiveBench coding91.0%84.2%Gemini 4 Carbon
LMArena WebDev17681520Gemini 4 Carbon
AA Coding IndexNot measured76.7Only GPT-5.6 Terra measured
LiveCodeBench (Vals AI)Not measured85.9%Only GPT-5.6 Terra measured
SWE-bench Verified (Vals AI)Not measured95.4%Only GPT-5.6 Terra measured
Terminal-Bench 4 (Vals AI)63.1%22.7%Gemini 4 Carbon
Vibe Code Bench (Vals AI)89.1%74.6%Gemini 4 Carbon
Code migration (Vals AI)Not measured47.8%Only GPT-5.6 Terra measured
ProgramBench (Vals AI)Not measured0.5%Only GPT-5.6 Terra measured
IOI (Vals AI)Not measured87.6%Only GPT-5.6 Terra measured
Terminal-Bench 2.1 (Vals AI)Not measured77.5%Only GPT-5.6 Terra measured
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
SciCodeNot measured55.0%Only GPT-5.6 Terra measured
Terminal-Bench Hard (Artificial Analysis run)Not measured62.9%Only GPT-5.6 Terra measured
Terminal-Bench 4.0 (Artificial Analysis run)65.2%35.4%Gemini 4 Carbon
FrontierCode 2.040.6%23.9%Gemini 4 Carbon
FrontierCodeNot measured41.3%Only GPT-5.6 Terra measured
FrontierSWE61.2%Not measuredOnly Gemini 4 Carbon measured
WeirdMLNot measured78.3%Only GPT-5.6 Terra measured
MirrorCodeNot measured41.1%Only GPT-5.6 Terra measured
ALE-Bench2374.71951.4Gemini 4 Carbon
LMArena Text: coding15641485Gemini 4 Carbon
LMArena Text: software and IT15521481Gemini 4 Carbon
LMArena WebDev: React17921511Gemini 4 Carbon
LMArena WebDev: HTML17701523Gemini 4 Carbon
LMArena WebDev: from an imageNot measured1539Only GPT-5.6 Terra measured
SciCodeNot measured10.8%Only GPT-5.6 Terra measured
SWE-Bench Pro V2Not measured92.4%Only GPT-5.6 Terra measured
GameBench 2Not measured53.5Only GPT-5.6 Terra measured
Terminal-Bench 2.1Not measured78.4%Only GPT-5.6 Terra measured
Terminal-Bench 3.0Not measured20.8%Only GPT-5.6 Terra measured
Terminal-Bench 4.0Not measured21.5%Only GPT-5.6 Terra measured
CursorBench 4.060.4%41.3%Gemini 4 Carbon
Neither model has a result on the other 17 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Gemini 4 Carbon and GPT-5.6 Terra
BenchmarkGemini 4 CarbonGPT-5.6 TerraLeader
AA Intelligence Index60.032.3Gemini 4 Carbon
Epoch Capabilities Index169.8160.7Gemini 4 Carbon
Agentic workLike-for-likePublic boards, shown as published, kept out of the index90
Agentic work benchmarks for Gemini 4 Carbon and GPT-5.6 Terra
BenchmarkGemini 4 CarbonGPT-5.6 TerraLeader
AA Agentic IndexNot measured43.2Only GPT-5.6 Terra measured
Design Arena: agents building web appsNot measured1095Only GPT-5.6 Terra measured
Design Arena: agents building full-stack appsNot measured1036Only GPT-5.6 Terra measured
Design Arena: agents building mobile apps12841097Gemini 4 Carbon
Design Arena: agents building Android appsNot measured1057Only GPT-5.6 Terra measured
Design Arena: agents building gamesNot measured1027Only GPT-5.6 Terra measured
Design Arena: HTML slidesNot measured999Only GPT-5.6 Terra measured
Design Arena: PowerPoint slidesNot measured1095Only GPT-5.6 Terra measured
Design Arena: spreadsheets1224999Gemini 4 Carbon
LiveBench research92.5%79.7%Gemini 4 Carbon
LiveBench browser80.0%70.3%Gemini 4 Carbon
LiveBench long agentic72.7%25.9%Gemini 4 Carbon
SREBench (Vals AI)Not measured9.5%Only GPT-5.6 Terra measured
Finance Agent (Vals AI)Not measured54.4%Only GPT-5.6 Terra measured
Tax Agent Bench (Vals AI)51.8%30.0%Gemini 4 Carbon
Legal Research Bench (Vals AI)55.8%41.4%Gemini 4 Carbon
Harvey's Legal Agent Benchmark (Vals AI)17.5%Not measuredOnly Gemini 4 Carbon measured
Excel Modeling Benchmark (Vals AI)Not measured66.2%Only GPT-5.6 Terra measured
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-Agents84.2%58.2%Gemini 4 Carbon
BALROGNot measured53.2%Only GPT-5.6 Terra measured
Vending-Bench 2$16,484$7,343Gemini 4 Carbon
Neither model has a result on the other 21 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index110
Reasoning benchmarks for Gemini 4 Carbon and GPT-5.6 Terra
BenchmarkGemini 4 CarbonGPT-5.6 TerraLeader
GPQA DiamondNot measured90.9%Only GPT-5.6 Terra measured
LiveBench reasoning90.6%90.6%Tie
MMMU Pro (Vals AI)Not measured86.5%Only GPT-5.6 Terra measured
GPQA Diamond (Artificial Analysis run)Not measured92.5%Only GPT-5.6 Terra measured
Humanity's Last Exam (Artificial Analysis run)Not measured42.9%Only GPT-5.6 Terra measured
HLE-Diamond (Artificial Analysis run)69.1%28.8%Gemini 4 Carbon
CritPt v2, hard subset (Artificial Analysis run)69.0%50.5%Gemini 4 Carbon
GPQA Diamond (Epoch AI run)96.5%93.3%Gemini 4 Carbon
ARC-AGI98.5%96.5%Gemini 4 Carbon
ARC-AGI-294.2%83.9%Gemini 4 Carbon
SimpleBench92.6%48.9%Gemini 4 Carbon
Chess puzzles78.0%47.0%Gemini 4 Carbon
Mystery game puzzles73.0%35.0%Gemini 4 Carbon
EBR-bench87.6%Not measuredOnly Gemini 4 Carbon measured
LMArena Text: hard prompts15511470Gemini 4 Carbon
LMArena Text: expert15821495Gemini 4 Carbon
LMArena Text: hard prompts in English15451465Gemini 4 Carbon
LMArena Vision: diagramsNot measured1291Only GPT-5.6 Terra measured
LMArena Vision: homeworkNot measured1308Only GPT-5.6 Terra measured
Kagi LLM BenchmarkNot measured51.3%Only GPT-5.6 Terra measured
Neither model has a result on the other 6 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index40
Math benchmarks for Gemini 4 Carbon and GPT-5.6 Terra
BenchmarkGemini 4 CarbonGPT-5.6 TerraLeader
OTIS Mock AIME100.0%99.7%Gemini 4 Carbon
FrontierMath, tiers 1 to 390.5%86.0%Gemini 4 Carbon
FrontierMath, tier 495.1%70.7%Gemini 4 Carbon
ProofBenchNot measured74.0%Only GPT-5.6 Terra measured
LMArena Text: mathNot measured1462Only GPT-5.6 Terra measured
LMArena Text: mathematical work15381476Gemini 4 Carbon
MathArena85.4%Not measuredOnly Gemini 4 Carbon measured
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index70
Knowledge benchmarks for Gemini 4 Carbon and GPT-5.6 Terra
BenchmarkGemini 4 CarbonGPT-5.6 TerraLeader
MMLU ProNot measured86.7%Only GPT-5.6 Terra measured
LegalBench (Vals AI)Not measured85.1%Only GPT-5.6 Terra measured
CorpFin (Vals AI)Not measured65.3%Only GPT-5.6 Terra measured
TaxEval (Vals AI)Not measured76.2%Only GPT-5.6 Terra measured
MortgageTax (Vals AI)Not measured67.3%Only GPT-5.6 Terra measured
MedCode (Vals AI)Not measured43.4%Only GPT-5.6 Terra measured
AA-Omniscience53.5-9.3Gemini 4 Carbon
SimpleQA Verified77.7%43.2%Gemini 4 Carbon
LMArena Text: science15351453Gemini 4 Carbon
LMArena Text: medicine and healthcare15251430Gemini 4 Carbon
LMArena Text: legal and government15421461Gemini 4 Carbon
LMArena Text: business and finance15201446Gemini 4 Carbon
FACTS Benchmark Suite78.4%61.3%Gemini 4 Carbon
PRBench Legal53.3%Not measuredOnly Gemini 4 Carbon measured
Neither model has a result on the other 7 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index60
Web design benchmarks for Gemini 4 Carbon and GPT-5.6 Terra
BenchmarkGemini 4 CarbonGPT-5.6 TerraLeader
Design Arena: websites13191260Gemini 4 Carbon
Design Arena: UI components13571250Gemini 4 Carbon
Design Arena: game dev13261220Gemini 4 Carbon
Design Arena: data vizNot measured1236Only GPT-5.6 Terra measured
Design Arena: 3D14341109Gemini 4 Carbon
Design Arena: all code categories13481229Gemini 4 Carbon
Design Arena: SVGNot measured1207Only GPT-5.6 Terra measured
Design Arena: ASCII artNot measured1171Only GPT-5.6 Terra measured
LiveBench design80.2%70.9%Gemini 4 Carbon
GeneralLike-for-likePublic boards, shown as published, kept out of the index141
General benchmarks for Gemini 4 Carbon and GPT-5.6 Terra
BenchmarkGemini 4 CarbonGPT-5.6 TerraLeader
Vals Index70.5%Not measuredOnly Gemini 4 Carbon measured
LiveBench data analysis86.5%79.3%Gemini 4 Carbon
Public Benefits Bench (Vals AI)Not measured62.4%Only GPT-5.6 Terra measured
SAGE (Vals AI)Not measured87.0%Only GPT-5.6 Terra measured
MedScribe (Vals AI)Not measured82.9%Only GPT-5.6 Terra measured
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)79.3%83.0%GPT-5.6 Terra
GDPval-AA17331461Gemini 4 Carbon
DTBenchNot measured93.3%Only GPT-5.6 Terra measured
LMCANot measured54.9%Only GPT-5.6 Terra measured
Surface Evolver BenchNot measured83.8%Only GPT-5.6 Terra measured
Furniture assembly77.5%54.2%Gemini 4 Carbon
LMArena Text15381449Gemini 4 Carbon
LMArena Text: instruction following15391455Gemini 4 Carbon
LMArena Text: creative writing15331414Gemini 4 Carbon
LMArena VisionNot measured1269Only GPT-5.6 Terra measured
LMArena Text: English15301448Gemini 4 Carbon
LMArena Text: non-English15341442Gemini 4 Carbon
LMArena Text: Chinese16131513Gemini 4 Carbon
LMArena Text: GermanNot measured1461Only GPT-5.6 Terra measured
LMArena Text: JapaneseNot measured1445Only GPT-5.6 Terra measured
LMArena Text: KoreanNot measured1423Only GPT-5.6 Terra measured
LMArena Text: FrenchNot measured1470Only GPT-5.6 Terra measured
LMArena Text: SpanishNot measured1449Only GPT-5.6 Terra measured
LMArena Text: Russian15601453Gemini 4 Carbon
LMArena Text: PolishNot measured1443Only GPT-5.6 Terra measured
LMArena Text: multi-turn15691455Gemini 4 Carbon
LMArena Text: longer queries15491454Gemini 4 Carbon
LMArena Text: writing and language15421431Gemini 4 Carbon
LMArena Text: entertainment and media15271418Gemini 4 Carbon
LMArena Vision: EnglishNot measured1268Only GPT-5.6 Terra measured
LMArena Vision: ChineseNot measured1326Only GPT-5.6 Terra measured
LMArena Vision: reading textNot measured1277Only GPT-5.6 Terra measured
LMArena Vision: humorNot measured1241Only GPT-5.6 Terra measured
LMArena Vision: creative writingNot measured1245Only GPT-5.6 Terra measured
LMArena DocumentNot measured1468Only GPT-5.6 Terra measured
EQ-Bench 4Not measured1220Only 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 4 Carbon and GPT-5.6 Terra
BenchmarkGemini 4 CarbonGPT-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 4 Carbon$0.0070Fits in one request
GPT-5.6 Terra$0.0080Fits in one request

Gemini 4 Carbon costs less

Repository review

50K input + 3K output tokens

Gemini 4 Carbon$0.130Fits in one request
GPT-5.6 Terra$0.136Fits in one request

Gemini 4 Carbon costs less

Agent loop

200K input + 10K output tokens

Gemini 4 Carbon$0.500Fits in one request
GPT-5.6 Terra$0.520Fits in one request

Gemini 4 Carbon 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 4 Carbon and GPT-5.6 Terra
SpecificationGoogle Gemini 4 CarbonOpenAI GPT-5.6 Terra
MakerGoogleOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedNovember 10, 2026July 9, 2026
Context window1.05M1.05M
Input $/Mtok$2.00$2.00
Output $/Mtok$10.00$12.00
Coding index86.663.5
Independent measurements behind it46
Cost per solved taskNot computable$0.42
SourceOpenRouter listingOpenRouter listing

Questions

Is Gemini 4 Carbon better than GPT-5.6 Terra for coding?

Pick Gemini 4 Carbon for coding: it scores 86.6 on the Vibe Coding Index against 63.5 for GPT-5.6 Terra, though on 4 benchmarks against 6. Pick GPT-5.6 Terra for a larger context window (1.05M against 1.05M tokens) and work measured by Long context reasoning (AA-LCR), where it leads.

Which is cheaper, Gemini 4 Carbon or GPT-5.6 Terra?

Gemini 4 Carbon costs $2.00 per million input tokens and $10.00 per million output tokens; GPT-5.6 Terra costs $2.00 and $12.00. Cost per solved task is known for GPT-5.6 Terra only.

Which has the bigger context window, Gemini 4 Carbon or GPT-5.6 Terra?

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

How many benchmarks is the Gemini 4 Carbon vs GPT-5.6 Terra comparison based on?

67 benchmarks have a result for both models as of November 14, 2026. Gemini 4 Carbon's coding index rests on 4 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.

Compare next

Embed this comparison on your site

Free under CC BY 4.0, while the source link stays visible. Preview the frame · Terms and other embeds

<iframe src="https://llmbenchmark.ai/embed/compare/gemini-4-carbon-vs-gpt-5-6-terra" title="Gemini 4 Carbon vs GPT-5.6 Terra, LLMBenchmark.ai" width="100%" height="360" style="border:0;max-width:100%" loading="lazy"></iframe>
<p style="font:13px/1.4 sans-serif;margin:6px 0 0">Source: <a href="https://llmbenchmark.ai/compare/gemini-4-carbon-vs-gpt-5-6-terra">LLMBenchmark.ai, Gemini 4 Carbon vs GPT-5.6 Terra</a></p>