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Claude Sonnet 4.5 vs Gemini 4 Argon

Gemini 4 Argon leads Claude Sonnet 4.5 on coding, 81.0 to 39.5 on the Vibe Coding Index, and Gemini 4 Argon costs 1.5x less per output token ($10.00 vs $15.00 per million). Updated October 21, 2026; 53 benchmarks have a result for both.

Replace Claude Sonnet 4.5 Replace Gemini 4 Argon
Claude Sonnet 4.5Anthropic
Coding
39.5
Overall
49.5
Output $/M
$15.00
0
Gemini 4 ArgonGoogle
Coding
81.0
Overall
84.0
Output $/M
$10.00
53
vs boards won of 53 shared

Claude Sonnet 4.5 or Gemini 4 Argon: which to pick

Pick Gemini 4 Argon for coding: it scores 81.0 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 ArgonGoogle81.0/1005 independent benchmarksNo cost per solved task
Shared results
53
Claude Sonnet 4.5 only
42
Gemini 4 Argon only
40
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 Argon 81.0 from 5 benchmarks.
Widest category
Agentic work, 61.7 points apart on average over 1 shared benchmark.
Widest single gap
ProofBench: Claude Sonnet 4.5 19.0% against Gemini 4 Argon 99.0%, 80.0 points apart on a 0 to 100 scale.
Output price
Claude Sonnet 4.5 $15.00 against Gemini 4 Argon $10.00 per million output tokens, 1.5x apart.
Context window
Claude Sonnet 4.5 takes 1M tokens, Gemini 4 Argon 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 ArgonTies
Coding06
Intelligence02
Agentic work01
Reasoning09
Math06
Knowledge07
Web design06
General016
All shared boards053
CodingLike-for-likeSix of these boards feed the Vibe Coding Index06
Coding benchmarks for Claude Sonnet 4.5 and Gemini 4 Argon
BenchmarkClaude Sonnet 4.5Gemini 4 ArgonLeader
SWE-bench Verified74.8%Not measuredOnly Claude Sonnet 4.5 measured
SWE-bench Multilingual67.0%Not measuredOnly Claude Sonnet 4.5 measured
LiveBench codingNot measured89.7%Only Gemini 4 Argon measured
LMArena WebDev13941678Gemini 4 Argon
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 measured57.6%Only Gemini 4 Argon measured
Vibe Code Bench (Vals AI)22.6%91.9%Gemini 4 Argon
Code migration (Vals AI)Not measured68.2%Only Gemini 4 Argon measured
ProgramBench (Vals AI)Not measured2.5%Only Gemini 4 Argon measured
IOI (Vals AI)Not measured100.0%Only Gemini 4 Argon measured
Terminal-Bench 2.1 (Vals AI)Not measured57.7%Only Gemini 4 Argon measured
SWE-bench Multimodal (Vals AI)Not measured56.0%Only Gemini 4 Argon measured
Vibe Code Bench 1-100 (Vals AI)Not measured21.2%Only Gemini 4 Argon measured
CyberBench (Vals AI)Not measured77.9%Only Gemini 4 Argon measured
SciCodeNot measured61.8%Only Gemini 4 Argon measured
Terminal-Bench46.5%Not measuredOnly Claude Sonnet 4.5 measured
FrontierCodeNot measured47.5%Only Gemini 4 Argon measured
FrontierSWENot measured55.0%Only Gemini 4 Argon 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 measured2100.1Only Gemini 4 Argon measured
LMArena Text: coding14881546Gemini 4 Argon
LMArena Text: software and IT14731556Gemini 4 Argon
LMArena WebDev: React13861692Gemini 4 Argon
LMArena WebDev: HTML13991643Gemini 4 Argon
SciCodeNot measured12.3%Only Gemini 4 Argon measured
Neither model has a result on the other 10 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
Intelligence benchmarks for Claude Sonnet 4.5 and Gemini 4 Argon
BenchmarkClaude Sonnet 4.5Gemini 4 ArgonLeader
AA Intelligence Index20.752.6Gemini 4 Argon
Epoch Capabilities Index146.7166.4Gemini 4 Argon
Agentic workLike-for-likePublic boards, shown as published, kept out of the index01
Agentic work benchmarks for Claude Sonnet 4.5 and Gemini 4 Argon
BenchmarkClaude Sonnet 4.5Gemini 4 ArgonLeader
AA Agentic Index15.8Not measuredOnly Claude Sonnet 4.5 measured
Design Arena: agents building web apps1059Not measuredOnly Claude Sonnet 4.5 measured
Design Arena: agents building full-stack apps1050Not measuredOnly Claude Sonnet 4.5 measured
Design Arena: agents building mobile apps1137Not measuredOnly Claude Sonnet 4.5 measured
Design Arena: spreadsheetsNot measured1142Only Gemini 4 Argon measured
LiveBench researchNot measured83.1%Only Gemini 4 Argon measured
LiveBench browserNot measured92.0%Only Gemini 4 Argon measured
LiveBench long agenticNot measured69.9%Only Gemini 4 Argon measured
SREBench (Vals AI)Not measured44.3%Only Gemini 4 Argon measured
Finance Agent (Vals AI)Not measured65.4%Only Gemini 4 Argon measured
Tax Agent Bench (Vals AI)Not measured44.6%Only Gemini 4 Argon measured
Legal Research Bench (Vals AI)Not measured54.8%Only Gemini 4 Argon measured
Harvey's Legal Agent Benchmark (Vals AI)Not measured27.1%Only Gemini 4 Argon measured
Excel Modeling Benchmark (Vals AI)Not measured75.2%Only Gemini 4 Argon measured
BioMysteryBench (Vals AI)Not measured76.3%Only Gemini 4 Argon measured
Terminal-Bench-Science (Vals AI)Not measured44.3%Only Gemini 4 Argon measured
Vals Science IndexNot measured55.4%Only Gemini 4 Argon measured
Time Horizon Index (Vals AI)Not measured52.5%Only Gemini 4 Argon measured
CUA-bench (Vals AI)Not measured4.8%Only Gemini 4 Argon measured
Robo-bench (Vals AI)Not measured0.8%Only Gemini 4 Argon measured
APEX-AgentsNot measured82.4%Only Gemini 4 Argon 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$13,718Gemini 4 Argon
Berkeley Function Calling Leaderboard (BFCL)73.2%Not measuredOnly Claude Sonnet 4.5 measured
Neither model has a result on the other 13 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index09
Reasoning benchmarks for Claude Sonnet 4.5 and Gemini 4 Argon
BenchmarkClaude Sonnet 4.5Gemini 4 ArgonLeader
GPQA Diamond81.6%Not measuredOnly Claude Sonnet 4.5 measured
LiveBench reasoningNot measured95.1%Only Gemini 4 Argon measured
MysteryMechanism (Vals AI)Not measured45.5%Only Gemini 4 Argon measured
MMMU Pro (Vals AI)79.3%Not measuredOnly Claude Sonnet 4.5 measured
Humanity's Last Exam (Artificial Analysis run)Not measured57.1%Only Gemini 4 Argon measured
GPQA Diamond (Epoch AI run)82.3%96.4%Gemini 4 Argon
ARC-AGI63.7%98.5%Gemini 4 Argon
ARC-AGI-213.6%91.3%Gemini 4 Argon
SimpleBench54.3%Not measuredOnly Claude Sonnet 4.5 measured
Chess puzzles10.0%59.0%Gemini 4 Argon
Mystery game puzzles17.0%64.0%Gemini 4 Argon
EBR-bench2.4%64.8%Gemini 4 Argon
VPCT39.8%Not measuredOnly Claude Sonnet 4.5 measured
LMArena Text: hard prompts14621546Gemini 4 Argon
LMArena Text: expert14831550Gemini 4 Argon
LMArena Text: hard prompts in English14711548Gemini 4 Argon
Kagi LLM Benchmark57.9%Not measuredOnly Claude Sonnet 4.5 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 Claude Sonnet 4.5 and Gemini 4 Argon
BenchmarkClaude Sonnet 4.5Gemini 4 ArgonLeader
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 Argon
FrontierMath, tiers 1 to 323.9%86.0%Gemini 4 Argon
FrontierMath, tier 42.4%78.0%Gemini 4 Argon
ProofBench19.0%99.0%Gemini 4 Argon
MATH level 597.7%Not measuredOnly Claude Sonnet 4.5 measured
LMArena Text: math14491536Gemini 4 Argon
LMArena Text: mathematical work14621557Gemini 4 Argon
Neither model has a result on the other 4 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index07
Knowledge benchmarks for Claude Sonnet 4.5 and Gemini 4 Argon
BenchmarkClaude Sonnet 4.5Gemini 4 ArgonLeader
MMLU Pro87.4%Not measuredOnly Claude Sonnet 4.5 measured
LegalBench (Vals AI)84.1%88.3%Gemini 4 Argon
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%58.8%Gemini 4 Argon
SimpleQA Verified30.7%76.0%Gemini 4 Argon
LMArena Text: science14481548Gemini 4 Argon
LMArena Text: medicine and healthcare14441555Gemini 4 Argon
LMArena Text: legal and government14511548Gemini 4 Argon
LMArena Text: business and finance14401525Gemini 4 Argon
FACTS Benchmark Suite40.6%Not measuredOnly Claude Sonnet 4.5 measured
Neither model has a result on the other 4 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index06
Web design benchmarks for Claude Sonnet 4.5 and Gemini 4 Argon
BenchmarkClaude Sonnet 4.5Gemini 4 ArgonLeader
Design Arena: websites11901315Gemini 4 Argon
Design Arena: UI components11731331Gemini 4 Argon
Design Arena: game dev11661375Gemini 4 Argon
Design Arena: data viz11671336Gemini 4 Argon
Design Arena: 3D11581389Gemini 4 Argon
Design Arena: all code categories11831329Gemini 4 Argon
Design Arena: SVG1115Not measuredOnly Claude Sonnet 4.5 measured
Design Arena: ASCII art1205Not measuredOnly Claude Sonnet 4.5 measured
LiveBench designNot measured73.7%Only Gemini 4 Argon measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index016
General benchmarks for Claude Sonnet 4.5 and Gemini 4 Argon
BenchmarkClaude Sonnet 4.5Gemini 4 ArgonLeader
Vals IndexNot measured69.2%Only Gemini 4 Argon measured
LiveBench data analysisNot measured85.2%Only Gemini 4 Argon measured
Public Benefits Bench (Vals AI)Not measured69.8%Only Gemini 4 Argon measured
SAGE (Vals AI)36.1%53.6%Gemini 4 Argon
MedScribe (Vals AI)84.5%87.4%Gemini 4 Argon
Long context reasoning (AA-LCR)Not measured79.7%Only Gemini 4 Argon measured
DTBench83.2%97.6%Gemini 4 Argon
LMCA38.8%63.7%Gemini 4 Argon
Furniture assemblyNot measured72.5%Only Gemini 4 Argon measured
LMArena Text14381532Gemini 4 Argon
LMArena Text: instruction following14591534Gemini 4 Argon
LMArena Text: creative writing14421527Gemini 4 Argon
LMArena Text: English14501538Gemini 4 Argon
LMArena Text: non-English14251522Gemini 4 Argon
LMArena Text: Chinese14601611Gemini 4 Argon
LMArena Text: German1427Not measuredOnly Claude Sonnet 4.5 measured
LMArena Text: Japanese1390Not measuredOnly Claude Sonnet 4.5 measured
LMArena Text: Korean1402Not measuredOnly Claude Sonnet 4.5 measured
LMArena Text: French1459Not measuredOnly Claude Sonnet 4.5 measured
LMArena Text: Spanish14581503Gemini 4 Argon
LMArena Text: Russian14371534Gemini 4 Argon
LMArena Text: Polish1423Not measuredOnly Claude Sonnet 4.5 measured
LMArena Text: multi-turn14651556Gemini 4 Argon
LMArena Text: longer queries14751547Gemini 4 Argon
LMArena Text: writing and language14421529Gemini 4 Argon
LMArena Text: entertainment and media14281527Gemini 4 Argon
LMArena Document1450Not measuredOnly Claude Sonnet 4.5 measured
Neither model has a result on the other 19 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 Argon
BenchmarkClaude Sonnet 4.5Gemini 4 ArgonLeader
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 Argon$0.0070Fits in one request

Gemini 4 Argon costs less

Repository review

50K input + 3K output tokens

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

Gemini 4 Argon costs less

Agent loop

200K input + 10K output tokens

Claude Sonnet 4.5$0.750Fits in one request
Gemini 4 Argon$0.500Fits in one request

Gemini 4 Argon 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 Argon
SpecificationAnthropic Claude Sonnet 4.5Google Gemini 4 Argon
MakerAnthropicGoogle
WeightsNo public weights listedNo public weights listed
ReleasedSeptember 29, 2025October 13, 2026
Context window1M1.05M
Input $/Mtok$3.00$2.00
Output $/Mtok$15.00$10.00
Coding index39.581.0
Independent measurements behind it35
Cost per solved task$1.16Not computable
SourceOpenRouter listingOpenRouter listing

Questions

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

Pick Gemini 4 Argon for coding: it scores 81.0 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 Argon?

Claude Sonnet 4.5 costs $3.00 per million input tokens and $15.00 per million output tokens; Gemini 4 Argon 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 Argon?

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

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

53 benchmarks have a result for both models as of October 21, 2026. Claude Sonnet 4.5's coding index rests on 3 independent benchmarks and Gemini 4 Argon's on 5. Where only one model has a result, the page says so instead of naming a winner.

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