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Gemini 4 Carbon vs GPT-6.1 Terra

Gemini 4 Carbon leads GPT-6.1 Terra on coding, 86.6 to 76.4 on the Vibe Coding Index, and GPT-6.1 Terra costs 2.0x less per output token ($5.00 vs $10.00 per million). Updated November 14, 2026; 45 benchmarks have a result for both.

Replace Gemini 4 Carbon Replace GPT-6.1 Terra
Gemini 4 CarbonGoogle
Coding
86.6
Overall
88.3
Output $/M
$10.00
36
GPT-6.1 TerraOpenAI
Coding
76.4
Overall
77.4
Output $/M
$5.00
8
vs boards won of 45 shared, 1 tied

Gemini 4 Carbon or GPT-6.1 Terra: which to pick

Pick Gemini 4 Carbon for coding: it scores 86.6 on the Vibe Coding Index against 76.4 for GPT-6.1 Terra.

Pick GPT-6.1 Terra for output tokens 2.0x cheaper ($5.00 vs $10.00 per million) and a larger context window (1.05M against 1.05M tokens).

Model AGemini 4 CarbonGoogle86.6/1004 independent benchmarksNo cost per solved taskModel BGPT-6.1 TerraOpenAI76.4/1004 independent benchmarksNo cost per solved task
Shared results
45
Gemini 4 Carbon only
28
GPT-6.1 Terra only
10
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-6.1 Terra 76.4 from 4 benchmarks.
Widest category
Agentic work, 22.1 points apart on average over 10 shared benchmarks.
Widest single gap
Vending-Bench 2: Gemini 4 Carbon $16,484 against GPT-6.1 Terra $9,107, 43.1 points apart on a 0 to 100 scale.
Output price
Gemini 4 Carbon $10.00 against GPT-6.1 Terra $5.00 per million output tokens, 2.0x apart.
Context window
Gemini 4 Carbon takes 1.05M tokens, GPT-6.1 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-6.1 TerraTies
Coding72
Intelligence20
Agentic work91
Reasoning61
Math111 tie
Knowledge30
Web design51
General32
All shared boards3681 tie
CodingLike-for-likeSix of these boards feed the Vibe Coding Index72
Coding benchmarks for Gemini 4 Carbon and GPT-6.1 Terra
BenchmarkGemini 4 CarbonGPT-6.1 TerraLeader
LiveBench coding91.0%89.2%Gemini 4 Carbon
LMArena WebDev17681678Gemini 4 Carbon
Terminal-Bench 4 (Vals AI)63.1%49.5%Gemini 4 Carbon
Vibe Code Bench (Vals AI)89.1%84.0%Gemini 4 Carbon
SciCodeNot measured55.1%Only GPT-6.1 Terra measured
Terminal-Bench 4.0 (Artificial Analysis run)65.2%55.6%Gemini 4 Carbon
FrontierCode 2.040.6%42.3%GPT-6.1 Terra
FrontierSWE61.2%Not measuredOnly Gemini 4 Carbon measured
MirrorCodeNot measured76.7%Only GPT-6.1 Terra measured
ALE-Bench2374.72608.8GPT-6.1 Terra
LMArena Text: coding1564Not measuredOnly Gemini 4 Carbon measured
LMArena Text: software and IT1552Not measuredOnly Gemini 4 Carbon measured
LMArena WebDev: React17921664Gemini 4 Carbon
LMArena WebDev: HTML17701740Gemini 4 Carbon
GameBench 2Not measured85.8Only GPT-6.1 Terra measured
Terminal-Bench 4.0Not measured51.8%Only GPT-6.1 Terra measured
CursorBench 4.060.4%Not measuredOnly Gemini 4 Carbon measured
Neither model has a result on the other 35 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Gemini 4 Carbon and GPT-6.1 Terra
BenchmarkGemini 4 CarbonGPT-6.1 TerraLeader
AA Intelligence Index60.051.3Gemini 4 Carbon
Epoch Capabilities Index169.8167.7Gemini 4 Carbon
Agentic workLike-for-likePublic boards, shown as published, kept out of the index91
Agentic work benchmarks for Gemini 4 Carbon and GPT-6.1 Terra
BenchmarkGemini 4 CarbonGPT-6.1 TerraLeader
Design Arena: agents building mobile apps12841169Gemini 4 Carbon
Design Arena: spreadsheets12241027Gemini 4 Carbon
LiveBench research92.5%79.1%Gemini 4 Carbon
LiveBench browser80.0%93.1%GPT-6.1 Terra
LiveBench long agentic72.7%56.2%Gemini 4 Carbon
Tax Agent Bench (Vals AI)51.8%17.1%Gemini 4 Carbon
Legal Research Bench (Vals AI)55.8%26.0%Gemini 4 Carbon
Harvey's Legal Agent Benchmark (Vals AI)17.5%1.7%Gemini 4 Carbon
APEX-Agents84.2%68.3%Gemini 4 Carbon
SpireClimbNot measured22.3%Only GPT-6.1 Terra measured
Vending-Bench 2$16,484$9,107Gemini 4 Carbon
Neither model has a result on the other 33 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index61
Reasoning benchmarks for Gemini 4 Carbon and GPT-6.1 Terra
BenchmarkGemini 4 CarbonGPT-6.1 TerraLeader
LiveBench reasoning90.6%88.7%Gemini 4 Carbon
Humanity's Last Exam (Artificial Analysis run)Not measured46.2%Only GPT-6.1 Terra measured
HLE-Diamond (Artificial Analysis run)69.1%47.3%Gemini 4 Carbon
CritPt v2, hard subset (Artificial Analysis run)69.0%68.0%Gemini 4 Carbon
GPQA Diamond (Epoch AI run)96.5%94.3%Gemini 4 Carbon
ARC-AGI98.5%Not measuredOnly Gemini 4 Carbon measured
ARC-AGI-294.2%Not measuredOnly Gemini 4 Carbon measured
SimpleBench92.6%72.2%Gemini 4 Carbon
Chess puzzles78.0%Not measuredOnly Gemini 4 Carbon measured
Mystery game puzzles73.0%74.0%GPT-6.1 Terra
EBR-bench87.6%78.1%Gemini 4 Carbon
LMArena Text: hard prompts1551Not measuredOnly Gemini 4 Carbon measured
LMArena Text: expert1582Not measuredOnly Gemini 4 Carbon measured
LMArena Text: hard prompts in English1545Not measuredOnly Gemini 4 Carbon measured
Humanity's Last Exam (Scale run)Not measured35.7%Only GPT-6.1 Terra measured
Neither model has a result on the other 11 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index11
Math benchmarks for Gemini 4 Carbon and GPT-6.1 Terra
BenchmarkGemini 4 CarbonGPT-6.1 TerraLeader
OTIS Mock AIME100.0%100.0%Tie
FrontierMath, tiers 1 to 390.5%90.9%GPT-6.1 Terra
FrontierMath, tier 495.1%92.7%Gemini 4 Carbon
LMArena Text: mathematical work1538Not measuredOnly Gemini 4 Carbon measured
MathArena85.4%Not measuredOnly Gemini 4 Carbon measured
Neither model has a result on the other 9 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index30
Knowledge benchmarks for Gemini 4 Carbon and GPT-6.1 Terra
BenchmarkGemini 4 CarbonGPT-6.1 TerraLeader
AA-Omniscience53.529.6Gemini 4 Carbon
SimpleQA Verified77.7%57.3%Gemini 4 Carbon
LMArena Text: science1535Not measuredOnly Gemini 4 Carbon measured
LMArena Text: medicine and healthcare1525Not measuredOnly Gemini 4 Carbon measured
LMArena Text: legal and government1542Not measuredOnly Gemini 4 Carbon measured
LMArena Text: business and finance1520Not measuredOnly Gemini 4 Carbon measured
FACTS Benchmark Suite78.4%74.1%Gemini 4 Carbon
PRBench Legal53.3%Not measuredOnly Gemini 4 Carbon measured
Neither model has a result on the other 13 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index51
Web design benchmarks for Gemini 4 Carbon and GPT-6.1 Terra
BenchmarkGemini 4 CarbonGPT-6.1 TerraLeader
Design Arena: websites13191287Gemini 4 Carbon
Design Arena: UI components13571289Gemini 4 Carbon
Design Arena: game dev13261332GPT-6.1 Terra
Design Arena: data vizNot measured1164Only GPT-6.1 Terra measured
Design Arena: 3D14341295Gemini 4 Carbon
Design Arena: all code categories13481299Gemini 4 Carbon
Design Arena: SVGNot measured1290Only GPT-6.1 Terra measured
LiveBench design80.2%79.7%Gemini 4 Carbon
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index32
General benchmarks for Gemini 4 Carbon and GPT-6.1 Terra
BenchmarkGemini 4 CarbonGPT-6.1 TerraLeader
Vals Index70.5%60.5%Gemini 4 Carbon
LiveBench data analysis86.5%82.3%Gemini 4 Carbon
Long context reasoning (AA-LCR)79.3%82.7%GPT-6.1 Terra
GDPval-AA17331476Gemini 4 Carbon
Furniture assembly77.5%79.2%GPT-6.1 Terra
LMArena Text1538Not measuredOnly Gemini 4 Carbon measured
LMArena Text: instruction following1539Not measuredOnly Gemini 4 Carbon measured
LMArena Text: creative writing1533Not measuredOnly Gemini 4 Carbon measured
LMArena Text: English1530Not measuredOnly Gemini 4 Carbon measured
LMArena Text: non-English1534Not measuredOnly Gemini 4 Carbon measured
LMArena Text: Chinese1613Not measuredOnly Gemini 4 Carbon measured
LMArena Text: Russian1560Not measuredOnly Gemini 4 Carbon measured
LMArena Text: multi-turn1569Not measuredOnly Gemini 4 Carbon measured
LMArena Text: longer queries1549Not measuredOnly Gemini 4 Carbon measured
LMArena Text: writing and language1542Not measuredOnly Gemini 4 Carbon measured
LMArena Text: entertainment and media1527Not measuredOnly Gemini 4 Carbon measured
MultiChallengeNot measured74.2%Only GPT-6.1 Terra measured
Neither model has a result on the other 32 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-6.1 Terra
BenchmarkGemini 4 CarbonGPT-6.1 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-6.1 Terra$0.0035Fits in one request

GPT-6.1 Terra costs less

Repository review

50K input + 3K output tokens

Gemini 4 Carbon$0.130Fits in one request
GPT-6.1 Terra$0.065Fits in one request

GPT-6.1 Terra costs less

Agent loop

200K input + 10K output tokens

Gemini 4 Carbon$0.500Fits in one request
GPT-6.1 Terra$0.250Fits in one request

GPT-6.1 Terra 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-6.1 Terra
SpecificationGoogle Gemini 4 CarbonOpenAI GPT-6.1 Terra
MakerGoogleOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedNovember 10, 2026October 26, 2026
Context window1.05M1.05M
Input $/Mtok$2.00$1.00
Output $/Mtok$10.00$5.00
Coding index86.676.4
Independent measurements behind it44
Cost per solved taskNot computableNot computable
SourceOpenRouter listingOpenRouter listing

Questions

Is Gemini 4 Carbon better than GPT-6.1 Terra for coding?

Pick Gemini 4 Carbon for coding: it scores 86.6 on the Vibe Coding Index against 76.4 for GPT-6.1 Terra. Pick GPT-6.1 Terra for output tokens 2.0x cheaper ($5.00 vs $10.00 per million) and a larger context window (1.05M against 1.05M tokens).

Which is cheaper, Gemini 4 Carbon or GPT-6.1 Terra?

Gemini 4 Carbon costs $2.00 per million input tokens and $10.00 per million output tokens; GPT-6.1 Terra costs $1.00 and $5.00. Cost per solved task is known for neither of them.

Which has the bigger context window, Gemini 4 Carbon or GPT-6.1 Terra?

GPT-6.1 Terra, with 1.05M tokens against 1.05M.

How many benchmarks is the Gemini 4 Carbon vs GPT-6.1 Terra comparison based on?

45 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-6.1 Terra's on 4. 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-4-carbon-vs-gpt-6-1-terra">LLMBenchmark.ai, Gemini 4 Carbon vs GPT-6.1 Terra</a></p>