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Gemini 4 Carbon vs GPT-5

Gemini 4 Carbon leads GPT-5 on coding, 86.6 to 38.8 on the Vibe Coding Index, at about the same output price ($10.00 vs $10.00 per million). Updated November 14, 2026; 47 benchmarks have a result for both.

Replace Gemini 4 Carbon Replace GPT-5
Gemini 4 CarbonGoogle
Coding
86.6
Overall
88.3
Output $/M
$10.00
47
GPT-5OpenAI
Coding
38.8
Overall
55.5
Output $/M
$10.00
0
vs boards won of 47 shared

Gemini 4 Carbon or GPT-5: which to pick

Pick Gemini 4 Carbon for coding: it scores 86.6 on the Vibe Coding Index against 38.8 for GPT-5.

GPT-5 is neither cheaper nor larger in context, and leads no benchmark both models were measured on.

Model AGemini 4 CarbonGoogle86.6/1004 independent benchmarksNo cost per solved taskModel BGPT-5OpenAI38.8/1003 independent benchmarks$0.39 per solved task
Shared results
47
Gemini 4 Carbon only
26
GPT-5 only
71
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 4 Carbon 86.6 from 4 benchmarks, GPT-5 38.8 from 3 benchmarks.
Widest category
Reasoning, 41.7 points apart on average over 11 shared benchmarks.
Widest single gap
ARC-AGI-2: Gemini 4 Carbon 94.2% against GPT-5 9.9%, 84.3 points apart on a 0 to 100 scale.
Output price
Both cost $10.00 per million output tokens.
Context window
Gemini 4 Carbon takes 1.05M tokens, GPT-5 400K.

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-5Ties
Coding60
Intelligence10
Reasoning110
Math50
Knowledge60
Web design50
General130
All shared boards470
CodingLike-for-likeSix of these boards feed the Vibe Coding Index60
Coding benchmarks for Gemini 4 Carbon and GPT-5
BenchmarkGemini 4 CarbonGPT-5Leader
Aider polyglotNot measured88.0%Only GPT-5 measured
SWE-bench VerifiedNot measured74.4%Only GPT-5 measured
LiveBench coding91.0%Not measuredOnly Gemini 4 Carbon measured
LMArena WebDev17681417Gemini 4 Carbon
AA Coding IndexNot measured37.8Only GPT-5 measured
LiveCodeBench (Vals AI)Not measured85.9%Only GPT-5 measured
SWE-bench Verified (Vals AI)Not measured69.0%Only GPT-5 measured
Terminal-Bench 4 (Vals AI)63.1%Not measuredOnly Gemini 4 Carbon measured
Vibe Code Bench (Vals AI)89.1%20.1%Gemini 4 Carbon
LiveCodeBench (Artificial Analysis run)Not measured84.6%Only GPT-5 measured
Terminal-Bench Hard (Artificial Analysis run)Not measured37.9%Only GPT-5 measured
Terminal-Bench 4.0 (Artificial Analysis run)65.2%Not measuredOnly Gemini 4 Carbon measured
FrontierCode 2.040.6%Not measuredOnly Gemini 4 Carbon measured
Terminal-BenchNot measured49.6%Only GPT-5 measured
FrontierSWE61.2%Not measuredOnly Gemini 4 Carbon measured
GSO-BenchNot measured6.9%Only GPT-5 measured
WeirdMLNot measured60.7%Only GPT-5 measured
MirrorCodeNot measured4.4%Only GPT-5 measured
ALE-Bench2374.7807.6Gemini 4 Carbon
LMArena Text: coding15641436Gemini 4 Carbon
LMArena Text: software and IT15521420Gemini 4 Carbon
LMArena WebDev: React1792Not measuredOnly Gemini 4 Carbon measured
LMArena WebDev: HTML17701425Gemini 4 Carbon
SciCodeNot measured0.0%Only GPT-5 measured
GameBench 2Not measured46.2Only GPT-5 measured
Terminal-Bench 2.0Not measured49.6%Only GPT-5 measured
CursorBench 4.060.4%Not measuredOnly Gemini 4 Carbon measured
Neither model has a result on the other 25 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index10
Intelligence benchmarks for Gemini 4 Carbon and GPT-5
BenchmarkGemini 4 CarbonGPT-5Leader
AA Intelligence Index60.0Not measuredOnly Gemini 4 Carbon measured
Epoch Capabilities Index169.8150.0Gemini 4 Carbon
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index18 boards, none shared
Agentic work benchmarks for Gemini 4 Carbon and GPT-5
BenchmarkGemini 4 CarbonGPT-5Leader
Design Arena: agents building mobile apps1284Not measuredOnly Gemini 4 Carbon measured
Design Arena: spreadsheets1224Not measuredOnly Gemini 4 Carbon measured
LiveBench research92.5%Not measuredOnly Gemini 4 Carbon measured
LiveBench browser80.0%Not measuredOnly Gemini 4 Carbon measured
LiveBench long agentic72.7%Not measuredOnly Gemini 4 Carbon measured
Tax Agent Bench (Vals AI)51.8%Not measuredOnly Gemini 4 Carbon measured
Legal Research Bench (Vals AI)55.8%Not measuredOnly Gemini 4 Carbon measured
Harvey's Legal Agent Benchmark (Vals AI)17.5%Not measuredOnly Gemini 4 Carbon measured
τ²-Bench TelecomNot measured86.5%Only GPT-5 measured
APEX-Agents84.2%Not measuredOnly Gemini 4 Carbon measured
METR time horizonsNot measured69.6%Only GPT-5 measured
Remote Labor IndexNot measured1.7%Only GPT-5 measured
GDPvalNot measured34.8%Only GPT-5 measured
BALROGNot measured32.8%Only GPT-5 measured
DeepResearch BenchNot measured49.6%Only GPT-5 measured
Vending-Bench 2$16,484Not measuredOnly Gemini 4 Carbon measured
LMArena SearchNot measured1133Only GPT-5 measured
BrowseComp-PlusNot measured80.0%Only GPT-5 measured
Neither model has a result on the other 26 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index110
Reasoning benchmarks for Gemini 4 Carbon and GPT-5
BenchmarkGemini 4 CarbonGPT-5Leader
GPQA DiamondNot measured85.6%Only GPT-5 measured
LiveBench reasoning90.6%Not measuredOnly Gemini 4 Carbon measured
MMMU Pro (Vals AI)Not measured81.5%Only GPT-5 measured
GPQA Diamond (Artificial Analysis run)Not measured85.4%Only GPT-5 measured
Humanity's Last Exam (Artificial Analysis run)Not measured28.5%Only GPT-5 measured
HLE-Diamond (Artificial Analysis run)69.1%Not measuredOnly Gemini 4 Carbon measured
CritPt v2, hard subset (Artificial Analysis run)69.0%11.5%Gemini 4 Carbon
GPQA Diamond (Epoch AI run)96.5%86.2%Gemini 4 Carbon
ARC-AGI98.5%65.7%Gemini 4 Carbon
ARC-AGI-294.2%9.9%Gemini 4 Carbon
SimpleBench92.6%56.7%Gemini 4 Carbon
Chess puzzles78.0%36.0%Gemini 4 Carbon
Mystery game puzzles73.0%23.0%Gemini 4 Carbon
EBR-bench87.6%12.7%Gemini 4 Carbon
VPCTNot measured66.0%Only GPT-5 measured
LMArena Text: hard prompts15511416Gemini 4 Carbon
LMArena Text: expert15821419Gemini 4 Carbon
LMArena Text: hard prompts in English15451419Gemini 4 Carbon
LMArena Vision: diagramsNot measured1251Only GPT-5 measured
LMArena Vision: homeworkNot measured1279Only GPT-5 measured
Kagi LLM BenchmarkNot measured72.7%Only GPT-5 measured
Neither model has a result on the other 5 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index50
Math benchmarks for Gemini 4 Carbon and GPT-5
BenchmarkGemini 4 CarbonGPT-5Leader
AIMENot measured93.4%Only GPT-5 measured
MATH 500 (Vals AI)Not measured96.0%Only GPT-5 measured
MGSM (Vals AI)Not measured92.8%Only GPT-5 measured
AIME 2025 (Artificial Analysis run)Not measured94.3%Only GPT-5 measured
OTIS Mock AIME100.0%91.4%Gemini 4 Carbon
FrontierMath, tiers 1 to 390.5%55.4%Gemini 4 Carbon
FrontierMath, tier 495.1%22.0%Gemini 4 Carbon
ProofBenchNot measured18.0%Only GPT-5 measured
MATH level 5Not measured98.1%Only GPT-5 measured
LMArena Text: mathNot measured1408Only GPT-5 measured
LMArena Text: mathematical work15381405Gemini 4 Carbon
MathArena85.4%16.9%Gemini 4 Carbon
Neither model has a result on the other 2 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index60
Knowledge benchmarks for Gemini 4 Carbon and GPT-5
BenchmarkGemini 4 CarbonGPT-5Leader
MMLU ProNot measured86.5%Only GPT-5 measured
LegalBench (Vals AI)Not measured86.0%Only GPT-5 measured
CaseLaw (Vals AI)Not measured66.5%Only GPT-5 measured
CorpFin (Vals AI)Not measured61.1%Only GPT-5 measured
TaxEval (Vals AI)Not measured73.4%Only GPT-5 measured
MortgageTax (Vals AI)Not measured65.5%Only GPT-5 measured
MedQA (Vals AI)Not measured96.3%Only GPT-5 measured
MedCode (Vals AI)Not measured49.6%Only GPT-5 measured
MMLU Pro (Artificial Analysis run)Not measured87.1%Only GPT-5 measured
AA-Omniscience53.5Not measuredOnly Gemini 4 Carbon measured
SimpleQA Verified77.7%50.1%Gemini 4 Carbon
GeoBenchNot measured81.0%Only GPT-5 measured
LMArena Text: science15351416Gemini 4 Carbon
LMArena Text: medicine and healthcare15251413Gemini 4 Carbon
LMArena Text: legal and government15421430Gemini 4 Carbon
LMArena Text: business and finance15201399Gemini 4 Carbon
FACTS Benchmark Suite78.4%Not measuredOnly Gemini 4 Carbon measured
PRBench FinanceNot measured51.3%Only GPT-5 measured
PRBench Legal53.3%49.0%Gemini 4 Carbon
Neither model has a result on the other 2 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index50
Web design benchmarks for Gemini 4 Carbon and GPT-5
BenchmarkGemini 4 CarbonGPT-5Leader
Design Arena: websites13191176Gemini 4 Carbon
Design Arena: UI components13571170Gemini 4 Carbon
Design Arena: game dev13261174Gemini 4 Carbon
Design Arena: data vizNot measured1218Only GPT-5 measured
Design Arena: 3D14341035Gemini 4 Carbon
Design Arena: all code categories13481157Gemini 4 Carbon
Design Arena: SVGNot measured1178Only GPT-5 measured
Design Arena: ASCII artNot measured1136Only GPT-5 measured
LiveBench design80.2%Not measuredOnly Gemini 4 Carbon measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index130
General benchmarks for Gemini 4 Carbon and GPT-5
BenchmarkGemini 4 CarbonGPT-5Leader
Vals Index70.5%Not measuredOnly Gemini 4 Carbon measured
LiveBench data analysis86.5%Not measuredOnly Gemini 4 Carbon measured
MedScribe (Vals AI)Not measured83.7%Only GPT-5 measured
IFBenchNot measured73.1%Only GPT-5 measured
Long context reasoning (AA-LCR)79.3%78.2%Gemini 4 Carbon
GDPval-AA1733925Gemini 4 Carbon
DTBenchNot measured90.7%Only GPT-5 measured
LMCANot measured40.0%Only GPT-5 measured
Fiction.LiveBenchNot measured97.2%Only GPT-5 measured
Furniture assembly77.5%Not measuredOnly Gemini 4 Carbon measured
LMArena Text15381406Gemini 4 Carbon
LMArena Text: instruction following15391388Gemini 4 Carbon
LMArena Text: creative writing15331365Gemini 4 Carbon
LMArena VisionNot measured1232Only GPT-5 measured
LMArena Text: English15301409Gemini 4 Carbon
LMArena Text: non-English15341397Gemini 4 Carbon
LMArena Text: Chinese16131422Gemini 4 Carbon
LMArena Text: GermanNot measured1416Only GPT-5 measured
LMArena Text: JapaneseNot measured1409Only GPT-5 measured
LMArena Text: KoreanNot measured1360Only GPT-5 measured
LMArena Text: FrenchNot measured1408Only GPT-5 measured
LMArena Text: SpanishNot measured1400Only GPT-5 measured
LMArena Text: Russian15601407Gemini 4 Carbon
LMArena Text: PolishNot measured1431Only GPT-5 measured
LMArena Text: multi-turn15691426Gemini 4 Carbon
LMArena Text: longer queries15491398Gemini 4 Carbon
LMArena Text: writing and language15421384Gemini 4 Carbon
LMArena Text: entertainment and media15271379Gemini 4 Carbon
LMArena Vision: EnglishNot measured1231Only GPT-5 measured
LMArena Vision: ChineseNot measured1267Only GPT-5 measured
LMArena Vision: reading textNot measured1245Only GPT-5 measured
LMArena Vision: humorNot measured1218Only GPT-5 measured
LMArena Vision: captioningNot measured1213Only GPT-5 measured
LMArena Vision: recognizing thingsNot measured1261Only GPT-5 measured
LMArena Vision: creative writingNot measured1211Only GPT-5 measured
MultiChallengeNot measured63.2%Only GPT-5 measured
Neither model has a result on the other 13 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
BenchmarkGemini 4 CarbonGPT-5Leader
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$0.0063Fits in one request

GPT-5 costs less

Repository review

50K input + 3K output tokens

Gemini 4 Carbon$0.130Fits in one request
GPT-5$0.092Fits in one request

GPT-5 costs less

Agent loop

200K input + 10K output tokens

Gemini 4 Carbon$0.500Fits in one request
GPT-5$0.350Fits in one request

GPT-5 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
SpecificationGoogle Gemini 4 CarbonOpenAI GPT-5
MakerGoogleOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedNovember 10, 2026August 7, 2025
Context window1.05M400K
Input $/Mtok$2.00$1.25
Output $/Mtok$10.00$10.00
Coding index86.638.8
Independent measurements behind it43
Cost per solved taskNot computable$0.39
SourceOpenRouter listingOpenRouter listing

Questions

Is Gemini 4 Carbon better than GPT-5 for coding?

Pick Gemini 4 Carbon for coding: it scores 86.6 on the Vibe Coding Index against 38.8 for GPT-5. GPT-5 is neither cheaper nor larger in context, and leads no benchmark both models were measured on.

Which is cheaper, Gemini 4 Carbon or GPT-5?

Gemini 4 Carbon costs $2.00 per million input tokens and $10.00 per million output tokens; GPT-5 costs $1.25 and $10.00. Cost per solved task is known for GPT-5 only.

Which has the bigger context window, Gemini 4 Carbon or GPT-5?

Gemini 4 Carbon, with 1.05M tokens against 400K.

How many benchmarks is the Gemini 4 Carbon vs GPT-5 comparison based on?

47 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's on 3. 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-5">LLMBenchmark.ai, Gemini 4 Carbon vs GPT-5</a></p>