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Claude Sonnet 5.5 vs Gemini 4 Argon

Claude Sonnet 5.5 leads Gemini 4 Argon on coding, 87.3 to 81.0 on the Vibe Coding Index, at about the same output price ($10.00 vs $10.00 per million). Updated October 22, 2026; 85 benchmarks have a result for both.

Replace Claude Sonnet 5.5 Replace Gemini 4 Argon
Claude Sonnet 5.5Anthropic
Coding
87.3
Overall
82.8
Output $/M
$10.00
38
Gemini 4 ArgonGoogle
Coding
81.0
Overall
84.0
Output $/M
$10.00
45
vs boards won of 85 shared, 2 tied

Claude Sonnet 5.5 or Gemini 4 Argon: which to pick

Pick Claude Sonnet 5.5 for coding: it scores 87.3 on the Vibe Coding Index against 81.0 for Gemini 4 Argon.

Pick Gemini 4 Argon for a larger context window (1.05M against 1M tokens) and work measured by IOI (Vals AI) or CyberBench (Vals AI), where it leads.

Model AClaude Sonnet 5.5Anthropic87.3/1005 independent benchmarksNo cost per solved taskModel BGemini 4 ArgonGoogle81.0/1005 independent benchmarksNo cost per solved task
Shared results
85
Claude Sonnet 5.5 only
11
Gemini 4 Argon only
9
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 5.5 87.3 from 5 benchmarks, Gemini 4 Argon 81.0 from 5 benchmarks.
Widest category
Knowledge, 13.6 points apart on average over 6 shared benchmarks.
Widest single gap
SimpleQA Verified: Claude Sonnet 5.5 46.5% against Gemini 4 Argon 76.0%, 29.5 points apart on a 0 to 100 scale.
Output price
Both cost $10.00 per million output tokens.
Context window
Claude Sonnet 5.5 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 5.5BarsGemini 4 ArgonTies
Coding136
Intelligence11
Agentic work78
Reasoning261 tie
Math321 tie
Knowledge06
Web design70
General516
All shared boards38452 ties
CodingLike-for-likeSix of these boards feed the Vibe Coding Index136
Coding benchmarks for Claude Sonnet 5.5 and Gemini 4 Argon
BenchmarkClaude Sonnet 5.5Gemini 4 ArgonLeader
LiveBench coding94.7%89.7%Claude Sonnet 5.5
LMArena WebDev17681678Claude Sonnet 5.5
Terminal-Bench 4 (Vals AI)64.1%57.6%Claude Sonnet 5.5
Vibe Code Bench (Vals AI)92.4%91.9%Claude Sonnet 5.5
Code migration (Vals AI)69.8%68.2%Claude Sonnet 5.5
ProgramBench (Vals AI)6.5%2.5%Claude Sonnet 5.5
IOI (Vals AI)83.1%100.0%Gemini 4 Argon
Terminal-Bench 2.1 (Vals AI)83.2%57.7%Claude Sonnet 5.5
SWE-bench Multimodal (Vals AI)58.3%56.0%Claude Sonnet 5.5
Vibe Code Bench 1-100 (Vals AI)Not measured21.2%Only Gemini 4 Argon measured
CyberBench (Vals AI)59.6%77.9%Gemini 4 Argon
SciCode61.0%61.8%Gemini 4 Argon
FrontierCode52.1%47.5%Claude Sonnet 5.5
FrontierSWE61.9%55.0%Claude Sonnet 5.5
MirrorCodeNot measured58.9%Only Gemini 4 Argon measured
ALE-Bench1819.12100.1Gemini 4 Argon
LMArena Text: coding15131546Gemini 4 Argon
LMArena Text: software and IT15041556Gemini 4 Argon
LMArena WebDev: React18171692Claude Sonnet 5.5
LMArena WebDev: HTML17411643Claude Sonnet 5.5
LMArena WebDev: from an image1737Not measuredOnly Claude Sonnet 5.5 measured
SciCode13.8%12.3%Claude Sonnet 5.5
Neither model has a result on the other 17 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index11
Intelligence benchmarks for Claude Sonnet 5.5 and Gemini 4 Argon
BenchmarkClaude Sonnet 5.5Gemini 4 ArgonLeader
AA Intelligence Index56.052.6Claude Sonnet 5.5
Epoch Capabilities Index166.2166.4Gemini 4 Argon
Agentic workLike-for-likePublic boards, shown as published, kept out of the index78
Agentic work benchmarks for Claude Sonnet 5.5 and Gemini 4 Argon
BenchmarkClaude Sonnet 5.5Gemini 4 ArgonLeader
Design Arena: agents building web apps1305Not measuredOnly Claude Sonnet 5.5 measured
Design Arena: agents building mobile apps1260Not measuredOnly Claude Sonnet 5.5 measured
Design Arena: spreadsheets12601157Claude Sonnet 5.5
LiveBench research83.6%83.1%Claude Sonnet 5.5
LiveBench browser84.0%92.0%Gemini 4 Argon
LiveBench long agentic78.8%69.9%Claude Sonnet 5.5
SREBench (Vals AI)30.1%44.3%Gemini 4 Argon
Finance Agent (Vals AI)58.1%65.4%Gemini 4 Argon
Tax Agent Bench (Vals AI)42.0%44.6%Gemini 4 Argon
Legal Research Bench (Vals AI)48.1%54.8%Gemini 4 Argon
Harvey's Legal Agent Benchmark (Vals AI)10.4%27.1%Gemini 4 Argon
Excel Modeling Benchmark (Vals AI)75.7%75.2%Claude Sonnet 5.5
BioMysteryBench (Vals AI)81.1%76.3%Claude Sonnet 5.5
Terminal-Bench-Science (Vals AI)47.1%44.3%Claude Sonnet 5.5
Vals Science Index59.1%55.4%Claude Sonnet 5.5
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-Agents75.5%82.4%Gemini 4 Argon
SpireClimb1.3%Not measuredOnly Claude Sonnet 5.5 measured
Vending-Bench 2$11,165$13,718Gemini 4 Argon
Neither model has a result on the other 20 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index26
Reasoning benchmarks for Claude Sonnet 5.5 and Gemini 4 Argon
BenchmarkClaude Sonnet 5.5Gemini 4 ArgonLeader
LiveBench reasoning91.6%95.1%Gemini 4 Argon
MysteryMechanism (Vals AI)49.1%45.5%Claude Sonnet 5.5
Humanity's Last Exam (Artificial Analysis run)55.0%57.1%Gemini 4 Argon
GPQA Diamond (Epoch AI run)95.6%96.4%Gemini 4 Argon
ARC-AGINot measured98.5%Only Gemini 4 Argon measured
ARC-AGI-2Not measured91.3%Only Gemini 4 Argon measured
Chess puzzles59.0%59.0%Tie
Mystery game puzzles65.0%64.0%Claude Sonnet 5.5
EBR-benchNot measured64.8%Only Gemini 4 Argon measured
LMArena Text: hard prompts14941546Gemini 4 Argon
LMArena Text: expert15311550Gemini 4 Argon
LMArena Text: hard prompts in English15021548Gemini 4 Argon
LMArena Vision: diagrams1329Not measuredOnly Claude Sonnet 5.5 measured
LMArena Vision: homework1331Not measuredOnly Claude Sonnet 5.5 measured
Neither model has a result on the other 8 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index32
Math benchmarks for Claude Sonnet 5.5 and Gemini 4 Argon
BenchmarkClaude Sonnet 5.5Gemini 4 ArgonLeader
OTIS Mock AIME100.0%100.0%Tie
FrontierMath, tiers 1 to 388.8%86.0%Claude Sonnet 5.5
FrontierMath, tier 480.5%78.0%Claude Sonnet 5.5
ProofBench100.0%99.0%Claude Sonnet 5.5
LMArena Text: math14971536Gemini 4 Argon
LMArena Text: mathematical work15101557Gemini 4 Argon
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index06
Knowledge benchmarks for Claude Sonnet 5.5 and Gemini 4 Argon
BenchmarkClaude Sonnet 5.5Gemini 4 ArgonLeader
LegalBench (Vals AI)Not measured88.3%Only Gemini 4 Argon measured
MedCode (Vals AI)52.9%58.8%Gemini 4 Argon
SimpleQA Verified46.5%76.0%Gemini 4 Argon
LMArena Text: science14831548Gemini 4 Argon
LMArena Text: medicine and healthcare14641555Gemini 4 Argon
LMArena Text: legal and government14831548Gemini 4 Argon
LMArena Text: business and finance14681525Gemini 4 Argon
Neither model has a result on the other 11 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index70
Web design benchmarks for Claude Sonnet 5.5 and Gemini 4 Argon
BenchmarkClaude Sonnet 5.5Gemini 4 ArgonLeader
Design Arena: websites13261315Claude Sonnet 5.5
Design Arena: UI components13681333Claude Sonnet 5.5
Design Arena: game dev14711377Claude Sonnet 5.5
Design Arena: data viz13921332Claude Sonnet 5.5
Design Arena: 3D14451388Claude Sonnet 5.5
Design Arena: all code categories13641329Claude Sonnet 5.5
LiveBench design85.0%73.7%Claude Sonnet 5.5
Neither model has a result on the other 2 boards here
GeneralLike-for-likePublic boards, shown as published, kept out of the index516
General benchmarks for Claude Sonnet 5.5 and Gemini 4 Argon
BenchmarkClaude Sonnet 5.5Gemini 4 ArgonLeader
Vals Index70.8%69.2%Claude Sonnet 5.5
LiveBench data analysis59.5%85.2%Gemini 4 Argon
Public Benefits Bench (Vals AI)67.2%69.8%Gemini 4 Argon
SAGE (Vals AI)51.8%53.6%Gemini 4 Argon
MedScribe (Vals AI)91.1%87.4%Claude Sonnet 5.5
Long context reasoning (AA-LCR)82.7%79.7%Claude Sonnet 5.5
DTBench97.3%97.6%Gemini 4 Argon
LMCA68.3%63.7%Claude Sonnet 5.5
Furniture assembly75.0%72.5%Claude Sonnet 5.5
LMArena Text14731532Gemini 4 Argon
LMArena Text: instruction following14921534Gemini 4 Argon
LMArena Text: creative writing14671527Gemini 4 Argon
LMArena Vision1287Not measuredOnly Claude Sonnet 5.5 measured
LMArena Text: English14841538Gemini 4 Argon
LMArena Text: non-English14561522Gemini 4 Argon
LMArena Text: Chinese15351611Gemini 4 Argon
LMArena Text: French1499Not measuredOnly Claude Sonnet 5.5 measured
LMArena Text: Spanish14511503Gemini 4 Argon
LMArena Text: Russian14541534Gemini 4 Argon
LMArena Text: multi-turn14651556Gemini 4 Argon
LMArena Text: longer queries14951547Gemini 4 Argon
LMArena Text: writing and language14741529Gemini 4 Argon
LMArena Text: entertainment and media14611527Gemini 4 Argon
LMArena Vision: English1289Not measuredOnly Claude Sonnet 5.5 measured
LMArena Vision: reading text1297Not measuredOnly Claude Sonnet 5.5 measured
LMArena Vision: creative writing1242Not measuredOnly Claude Sonnet 5.5 measured
Neither model has a result on the other 20 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Claude Sonnet 5.5 and Gemini 4 Argon
BenchmarkClaude Sonnet 5.5Gemini 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 5.5$0.0070Fits in one request
Gemini 4 Argon$0.0070Fits in one request

Same cost

Repository review

50K input + 3K output tokens

Claude Sonnet 5.5$0.130Fits in one request
Gemini 4 Argon$0.130Fits in one request

Same cost

Agent loop

200K input + 10K output tokens

Claude Sonnet 5.5$0.500Fits in one request
Gemini 4 Argon$0.500Fits in one request

Same cost

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 5.5 and Gemini 4 Argon
SpecificationAnthropic Claude Sonnet 5.5Google Gemini 4 Argon
MakerAnthropicGoogle
WeightsNo public weights listedNo public weights listed
ReleasedSeptember 28, 2026October 13, 2026
Context window1M1.05M
Input $/Mtok$2.00$2.00
Output $/Mtok$10.00$10.00
Coding index87.381.0
Independent measurements behind it55
Cost per solved taskNot computableNot computable
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Sonnet 5.5 better than Gemini 4 Argon for coding?

Pick Claude Sonnet 5.5 for coding: it scores 87.3 on the Vibe Coding Index against 81.0 for Gemini 4 Argon. Pick Gemini 4 Argon for a larger context window (1.05M against 1M tokens) and work measured by IOI (Vals AI) or CyberBench (Vals AI), where it leads.

Which is cheaper, Claude Sonnet 5.5 or Gemini 4 Argon?

Claude Sonnet 5.5 costs $2.00 per million input tokens and $10.00 per million output tokens; Gemini 4 Argon costs $2.00 and $10.00. Cost per solved task is known for neither of them.

Which has the bigger context window, Claude Sonnet 5.5 or Gemini 4 Argon?

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

How many benchmarks is the Claude Sonnet 5.5 vs Gemini 4 Argon comparison based on?

85 benchmarks have a result for both models as of October 22, 2026. Claude Sonnet 5.5's coding index rests on 5 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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<p style="font:13px/1.4 sans-serif;margin:6px 0 0">Source: <a href="https://llmbenchmark.ai/compare/claude-sonnet-5-5-vs-gemini-4-argon">LLMBenchmark.ai, Claude Sonnet 5.5 vs Gemini 4 Argon</a></p>