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Claude Sonnet 4.5 vs Gemini 4 Carbon

Gemini 4 Carbon leads Claude Sonnet 4.5 on coding, 86.6 to 39.5 on the Vibe Coding Index, and Gemini 4 Carbon costs 1.5x less per output token ($10.00 vs $15.00 per million). Updated November 14, 2026; 46 benchmarks have a result for both.

Replace Claude Sonnet 4.5 Replace Gemini 4 Carbon
Claude Sonnet 4.5Anthropic
Coding
39.5
Overall
53.8
Output $/M
$15.00
0
Gemini 4 CarbonGoogle
Coding
86.6
Overall
88.3
Output $/M
$10.00
46
vs boards won of 46 shared

Claude Sonnet 4.5 or Gemini 4 Carbon: which to pick

Pick Gemini 4 Carbon for coding: it scores 86.6 on the Vibe Coding Index against 39.5 for Claude Sonnet 4.5.

Claude Sonnet 4.5 is neither cheaper nor larger in context, and leads no benchmark both models were measured on.

Model AClaude Sonnet 4.5Anthropic39.5/1003 independent benchmarks$1.16 per solved taskModel BGemini 4 CarbonGoogle86.6/1004 independent benchmarksNo cost per solved task
Shared results
46
Claude Sonnet 4.5 only
54
Gemini 4 Carbon only
27
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
Claude Sonnet 4.5 39.5 from 3 benchmarks, Gemini 4 Carbon 86.6 from 4 benchmarks.
Widest category
Math, 53.3 points apart on average over 5 shared benchmarks.
Widest single gap
FrontierMath, tier 4: Claude Sonnet 4.5 2.4% against Gemini 4 Carbon 95.1%, 92.7 points apart on a 0 to 100 scale.
Output price
Claude Sonnet 4.5 $15.00 against Gemini 4 Carbon $10.00 per million output tokens, 1.5x apart.
Context window
Claude Sonnet 4.5 takes 1M tokens, Gemini 4 Carbon 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
CategoryClaude Sonnet 4.5BarsGemini 4 CarbonTies
Coding06
Intelligence01
Agentic work02
Reasoning010
Math05
Knowledge06
Web design05
General011
All shared boards046
CodingLike-for-likeSix of these boards feed the Vibe Coding Index06
Coding benchmarks for Claude Sonnet 4.5 and Gemini 4 Carbon
BenchmarkClaude Sonnet 4.5Gemini 4 CarbonLeader
SWE-bench Verified74.8%Not measuredOnly Claude Sonnet 4.5 measured
SWE-bench Multilingual67.0%Not measuredOnly Claude Sonnet 4.5 measured
LiveBench codingNot measured91.0%Only Gemini 4 Carbon measured
LMArena WebDev13931768Gemini 4 Carbon
AA Coding Index52.1Not measuredOnly Claude Sonnet 4.5 measured
LiveCodeBench (Vals AI)73.0%Not measuredOnly Claude Sonnet 4.5 measured
SWE-bench Verified (Vals AI)70.0%Not measuredOnly Claude Sonnet 4.5 measured
Terminal-Bench 4 (Vals AI)Not measured63.1%Only Gemini 4 Carbon measured
Vibe Code Bench (Vals AI)22.6%89.1%Gemini 4 Carbon
Terminal-Bench 4.0 (Artificial Analysis run)Not measured65.2%Only Gemini 4 Carbon measured
FrontierCode 2.0Not measured40.6%Only Gemini 4 Carbon measured
Terminal-Bench46.5%Not measuredOnly Claude Sonnet 4.5 measured
FrontierSWENot measured61.2%Only Gemini 4 Carbon measured
GSO-Bench14.7%Not measuredOnly Claude Sonnet 4.5 measured
WeirdML47.7%Not measuredOnly Claude Sonnet 4.5 measured
Cybench60.0%Not measuredOnly Claude Sonnet 4.5 measured
ALE-BenchNot measured2374.7Only Gemini 4 Carbon measured
LMArena Text: coding14881564Gemini 4 Carbon
LMArena Text: software and IT14731552Gemini 4 Carbon
LMArena WebDev: React13861792Gemini 4 Carbon
LMArena WebDev: HTML13981770Gemini 4 Carbon
Terminal-Bench 2.046.5%Not measuredOnly Claude Sonnet 4.5 measured
CursorBench 4.0Not measured60.4%Only Gemini 4 Carbon measured
Neither model has a result on the other 29 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01
Intelligence benchmarks for Claude Sonnet 4.5 and Gemini 4 Carbon
BenchmarkClaude Sonnet 4.5Gemini 4 CarbonLeader
AA Intelligence IndexNot measured60.0Only Gemini 4 Carbon measured
Epoch Capabilities Index147.6169.8Gemini 4 Carbon
Agentic workLike-for-likePublic boards, shown as published, kept out of the index02
Agentic work benchmarks for Claude Sonnet 4.5 and Gemini 4 Carbon
BenchmarkClaude Sonnet 4.5Gemini 4 CarbonLeader
AA Agentic Index15.8Not measuredOnly Claude Sonnet 4.5 measured
Design Arena: agents building web apps1036Not measuredOnly Claude Sonnet 4.5 measured
Design Arena: agents building full-stack apps1024Not measuredOnly Claude Sonnet 4.5 measured
Design Arena: agents building mobile apps11301284Gemini 4 Carbon
Design Arena: spreadsheetsNot measured1224Only Gemini 4 Carbon measured
LiveBench researchNot measured92.5%Only Gemini 4 Carbon measured
LiveBench browserNot measured80.0%Only Gemini 4 Carbon measured
LiveBench long agenticNot measured72.7%Only Gemini 4 Carbon measured
Tax Agent Bench (Vals AI)Not measured51.8%Only Gemini 4 Carbon measured
Legal Research Bench (Vals AI)Not measured55.8%Only Gemini 4 Carbon measured
Harvey's Legal Agent Benchmark (Vals AI)Not measured17.5%Only Gemini 4 Carbon measured
APEX-AgentsNot measured84.2%Only Gemini 4 Carbon measured
METR time horizons67.4%Not measuredOnly Claude Sonnet 4.5 measured
Remote Labor Index2.1%Not measuredOnly Claude Sonnet 4.5 measured
GDPval42.5%Not measuredOnly Claude Sonnet 4.5 measured
DeepResearch Bench52.6%Not measuredOnly Claude Sonnet 4.5 measured
OSWorld62.9%Not measuredOnly Claude Sonnet 4.5 measured
Vending-Bench 2$3,839$16,484Gemini 4 Carbon
LMArena Search1159Not measuredOnly Claude Sonnet 4.5 measured
Berkeley Function Calling Leaderboard (BFCL)73.2%Not measuredOnly Claude Sonnet 4.5 measured
MCP Atlas59.5%Not measuredOnly Claude Sonnet 4.5 measured
Neither model has a result on the other 23 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index010
Reasoning benchmarks for Claude Sonnet 4.5 and Gemini 4 Carbon
BenchmarkClaude Sonnet 4.5Gemini 4 CarbonLeader
GPQA Diamond81.6%Not measuredOnly Claude Sonnet 4.5 measured
LiveBench reasoningNot measured90.6%Only Gemini 4 Carbon measured
MMMU Pro (Vals AI)79.3%Not measuredOnly Claude Sonnet 4.5 measured
HLE-Diamond (Artificial Analysis run)Not measured69.1%Only Gemini 4 Carbon measured
CritPt v2, hard subset (Artificial Analysis run)Not measured69.0%Only Gemini 4 Carbon measured
GPQA Diamond (Epoch AI run)82.3%96.5%Gemini 4 Carbon
ARC-AGI63.7%98.5%Gemini 4 Carbon
ARC-AGI-213.6%94.2%Gemini 4 Carbon
SimpleBench54.3%92.6%Gemini 4 Carbon
Chess puzzles10.0%78.0%Gemini 4 Carbon
Mystery game puzzles17.0%73.0%Gemini 4 Carbon
EBR-bench2.4%87.6%Gemini 4 Carbon
VPCT39.8%Not measuredOnly Claude Sonnet 4.5 measured
LMArena Text: hard prompts14621551Gemini 4 Carbon
LMArena Text: expert14831582Gemini 4 Carbon
LMArena Text: hard prompts in English14711545Gemini 4 Carbon
Kagi LLM Benchmark57.9%Not measuredOnly Claude Sonnet 4.5 measured
Neither model has a result on the other 9 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index05
Math benchmarks for Claude Sonnet 4.5 and Gemini 4 Carbon
BenchmarkClaude Sonnet 4.5Gemini 4 CarbonLeader
AIME88.2%Not measuredOnly Claude Sonnet 4.5 measured
MGSM (Vals AI)94.3%Not measuredOnly Claude Sonnet 4.5 measured
OTIS Mock AIME77.8%100.0%Gemini 4 Carbon
FrontierMath, tiers 1 to 323.9%90.5%Gemini 4 Carbon
FrontierMath, tier 42.4%95.1%Gemini 4 Carbon
ProofBench19.0%Not measuredOnly Claude Sonnet 4.5 measured
MATH level 597.7%Not measuredOnly Claude Sonnet 4.5 measured
LMArena Text: math1449Not measuredOnly Claude Sonnet 4.5 measured
LMArena Text: mathematical work14631538Gemini 4 Carbon
MathArena13.2%85.4%Gemini 4 Carbon
Neither model has a result on the other 4 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index06
Knowledge benchmarks for Claude Sonnet 4.5 and Gemini 4 Carbon
BenchmarkClaude Sonnet 4.5Gemini 4 CarbonLeader
MMLU Pro87.4%Not measuredOnly Claude Sonnet 4.5 measured
LegalBench (Vals AI)84.1%Not measuredOnly Claude Sonnet 4.5 measured
CaseLaw (Vals AI)62.2%Not measuredOnly Claude Sonnet 4.5 measured
CorpFin (Vals AI)62.0%Not measuredOnly Claude Sonnet 4.5 measured
TaxEval (Vals AI)73.3%Not measuredOnly Claude Sonnet 4.5 measured
MortgageTax (Vals AI)64.0%Not measuredOnly Claude Sonnet 4.5 measured
MedQA (Vals AI)94.7%Not measuredOnly Claude Sonnet 4.5 measured
MedCode (Vals AI)44.1%Not measuredOnly Claude Sonnet 4.5 measured
AA-OmniscienceNot measured53.5Only Gemini 4 Carbon measured
SimpleQA Verified30.7%77.7%Gemini 4 Carbon
GeoBench60.0%Not measuredOnly Claude Sonnet 4.5 measured
LMArena Text: science14471535Gemini 4 Carbon
LMArena Text: medicine and healthcare14431525Gemini 4 Carbon
LMArena Text: legal and government14501542Gemini 4 Carbon
LMArena Text: business and finance14401520Gemini 4 Carbon
FACTS Benchmark SuiteNot measured78.4%Only Gemini 4 Carbon measured
PRBench Finance43.8%Not measuredOnly Claude Sonnet 4.5 measured
PRBench Legal40.8%53.3%Gemini 4 Carbon
Neither model has a result on the other 3 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index05
Web design benchmarks for Claude Sonnet 4.5 and Gemini 4 Carbon
BenchmarkClaude Sonnet 4.5Gemini 4 CarbonLeader
Design Arena: websites11811319Gemini 4 Carbon
Design Arena: UI components11621357Gemini 4 Carbon
Design Arena: game dev11551326Gemini 4 Carbon
Design Arena: data viz1164Not measuredOnly Claude Sonnet 4.5 measured
Design Arena: 3D11371434Gemini 4 Carbon
Design Arena: all code categories11721348Gemini 4 Carbon
Design Arena: SVG1104Not measuredOnly Claude Sonnet 4.5 measured
Design Arena: ASCII art1200Not measuredOnly Claude Sonnet 4.5 measured
LiveBench designNot measured80.2%Only Gemini 4 Carbon measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index011
General benchmarks for Claude Sonnet 4.5 and Gemini 4 Carbon
BenchmarkClaude Sonnet 4.5Gemini 4 CarbonLeader
Vals IndexNot measured70.5%Only Gemini 4 Carbon measured
LiveBench data analysisNot measured86.5%Only Gemini 4 Carbon measured
MedScribe (Vals AI)84.5%Not measuredOnly Claude Sonnet 4.5 measured
Long context reasoning (AA-LCR)Not measured79.3%Only Gemini 4 Carbon measured
GDPval-AANot measured1733Only Gemini 4 Carbon measured
DTBench83.2%Not measuredOnly Claude Sonnet 4.5 measured
LMCA38.8%Not measuredOnly Claude Sonnet 4.5 measured
Furniture assemblyNot measured77.5%Only Gemini 4 Carbon measured
LMArena Text14391538Gemini 4 Carbon
LMArena Text: instruction following14591539Gemini 4 Carbon
LMArena Text: creative writing14421533Gemini 4 Carbon
LMArena Text: English14501530Gemini 4 Carbon
LMArena Text: non-English14251534Gemini 4 Carbon
LMArena Text: Chinese14611613Gemini 4 Carbon
LMArena Text: German1427Not measuredOnly Claude Sonnet 4.5 measured
LMArena Text: Japanese1389Not measuredOnly Claude Sonnet 4.5 measured
LMArena Text: Korean1400Not measuredOnly Claude Sonnet 4.5 measured
LMArena Text: French1459Not measuredOnly Claude Sonnet 4.5 measured
LMArena Text: Spanish1457Not measuredOnly Claude Sonnet 4.5 measured
LMArena Text: Russian14371560Gemini 4 Carbon
LMArena Text: Polish1423Not measuredOnly Claude Sonnet 4.5 measured
LMArena Text: multi-turn14651569Gemini 4 Carbon
LMArena Text: longer queries14761549Gemini 4 Carbon
LMArena Text: writing and language14421542Gemini 4 Carbon
LMArena Text: entertainment and media14291527Gemini 4 Carbon
LMArena Document1449Not measuredOnly Claude Sonnet 4.5 measured
MultiChallenge55.3%Not measuredOnly Claude Sonnet 4.5 measured
Neither model has a result on the other 22 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Claude Sonnet 4.5 and Gemini 4 Carbon
BenchmarkClaude Sonnet 4.5Gemini 4 CarbonLeader
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

Claude Sonnet 4.5$0.011Fits in one request
Gemini 4 Carbon$0.0070Fits in one request

Gemini 4 Carbon costs less

Repository review

50K input + 3K output tokens

Claude Sonnet 4.5$0.195Fits in one request
Gemini 4 Carbon$0.130Fits in one request

Gemini 4 Carbon costs less

Agent loop

200K input + 10K output tokens

Claude Sonnet 4.5$0.750Fits in one request
Gemini 4 Carbon$0.500Fits 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 Claude Sonnet 4.5 and Gemini 4 Carbon
SpecificationAnthropic Claude Sonnet 4.5Google Gemini 4 Carbon
MakerAnthropicGoogle
WeightsNo public weights listedNo public weights listed
ReleasedSeptember 29, 2025November 10, 2026
Context window1M1.05M
Input $/Mtok$3.00$2.00
Output $/Mtok$15.00$10.00
Coding index39.586.6
Independent measurements behind it34
Cost per solved task$1.16Not computable
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Sonnet 4.5 better than Gemini 4 Carbon for coding?

Pick Gemini 4 Carbon for coding: it scores 86.6 on the Vibe Coding Index against 39.5 for Claude Sonnet 4.5. Claude Sonnet 4.5 is neither cheaper nor larger in context, and leads no benchmark both models were measured on.

Which is cheaper, Claude Sonnet 4.5 or Gemini 4 Carbon?

Claude Sonnet 4.5 costs $3.00 per million input tokens and $15.00 per million output tokens; Gemini 4 Carbon costs $2.00 and $10.00. Cost per solved task is known for Claude Sonnet 4.5 only.

Which has the bigger context window, Claude Sonnet 4.5 or Gemini 4 Carbon?

Gemini 4 Carbon, with 1.05M tokens against 1M.

How many benchmarks is the Claude Sonnet 4.5 vs Gemini 4 Carbon comparison based on?

46 benchmarks have a result for both models as of November 14, 2026. Claude Sonnet 4.5's coding index rests on 3 independent benchmarks and Gemini 4 Carbon'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/claude-sonnet-4-5-vs-gemini-4-carbon">LLMBenchmark.ai, Claude Sonnet 4.5 vs Gemini 4 Carbon</a></p>