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Claude Opus 5 vs Gemini 4 Argon

Claude Opus 5 leads Gemini 4 Argon on coding, 83.0 to 81.0 on the Vibe Coding Index, and Gemini 4 Argon costs 2.5x less per output token ($10.00 vs $25.00 per million). Updated October 22, 2026; 88 benchmarks have a result for both.

Replace Claude Opus 5 Replace Gemini 4 Argon
Claude Opus 5Anthropic
Coding
83.0
Overall
81.6
Output $/M
$25.00
25
Gemini 4 ArgonGoogle
Coding
81.0
Overall
84.0
Output $/M
$10.00
62
vs boards won of 88 shared, 1 tied

Claude Opus 5 or Gemini 4 Argon: which to pick

Pick Claude Opus 5 for coding: it scores 83.0 on the Vibe Coding Index against 81.0 for Gemini 4 Argon.

Pick Gemini 4 Argon for output tokens 2.5x cheaper ($10.00 vs $25.00 per million) and a larger context window (1.05M against 1M tokens).

Model AClaude Opus 5Anthropic83.0/1006 independent benchmarks$1.33 per solved taskModel BGemini 4 ArgonGoogle81.0/1005 independent benchmarksNo cost per solved task
Shared results
88
Claude Opus 5 only
43
Gemini 4 Argon only
6
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 Opus 5 83.0 from 6 benchmarks, Gemini 4 Argon 81.0 from 5 benchmarks.
Widest category
Agentic work, 10.8 points apart on average over 15 shared benchmarks.
Widest single gap
Time Horizon Index (Vals AI): Claude Opus 5 18.8% against Gemini 4 Argon 52.5%, 33.7 points apart on a 0 to 100 scale.
Output price
Claude Opus 5 $25.00 against Gemini 4 Argon $10.00 per million output tokens, 2.5x apart.
Context window
Claude Opus 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 Opus 5BarsGemini 4 ArgonTies
Coding109
Intelligence02
Agentic work510
Reasoning111
Math051 tie
Knowledge16
Web design25
General614
All shared boards25621 tie
CodingLike-for-likeSix of these boards feed the Vibe Coding Index109
Coding benchmarks for Claude Opus 5 and Gemini 4 Argon
BenchmarkClaude Opus 5Gemini 4 ArgonLeader
LiveBench coding90.8%89.7%Claude Opus 5
LMArena WebDev16891678Claude Opus 5
AA Coding Index78.0Not measuredOnly Claude Opus 5 measured
LiveCodeBench (Vals AI)89.0%Not measuredOnly Claude Opus 5 measured
SWE-bench Verified (Vals AI)97.0%Not measuredOnly Claude Opus 5 measured
Terminal-Bench 4 (Vals AI)53.5%57.6%Gemini 4 Argon
Vibe Code Bench (Vals AI)88.4%91.9%Gemini 4 Argon
Code migration (Vals AI)57.5%68.2%Gemini 4 Argon
ProgramBench (Vals AI)3.0%2.5%Claude Opus 5
IOI (Vals AI)84.3%100.0%Gemini 4 Argon
Terminal-Bench 2.1 (Vals AI)84.6%57.7%Claude Opus 5
SWE-bench Multimodal (Vals AI)Not measured56.0%Only Gemini 4 Argon measured
Vibe Code Bench 1-100 (Vals AI)28.5%21.2%Claude Opus 5
SkillsBench (Vals AI)60.4%Not measuredOnly Claude Opus 5 measured
CyberBench (Vals AI)65.4%77.9%Gemini 4 Argon
SciCode56.4%61.8%Gemini 4 Argon
FrontierCode53.4%47.5%Claude Opus 5
FrontierSWE52.0%55.0%Gemini 4 Argon
WeirdML91.8%Not measuredOnly Claude Opus 5 measured
MirrorCodeNot measured58.9%Only Gemini 4 Argon measured
ALE-Bench2164.62100.1Claude Opus 5
LMArena Text: coding15331546Gemini 4 Argon
LMArena Text: software and IT15271556Gemini 4 Argon
LMArena WebDev: React17111692Claude Opus 5
LMArena WebDev: HTML16801643Claude Opus 5
LMArena WebDev: from an image1662Not measuredOnly Claude Opus 5 measured
SciCode13.8%12.3%Claude Opus 5
Neither model has a result on the other 12 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
Intelligence benchmarks for Claude Opus 5 and Gemini 4 Argon
BenchmarkClaude Opus 5Gemini 4 ArgonLeader
AA Intelligence Index50.852.6Gemini 4 Argon
Epoch Capabilities Index163.9166.4Gemini 4 Argon
Agentic workLike-for-likePublic boards, shown as published, kept out of the index510
Agentic work benchmarks for Claude Opus 5 and Gemini 4 Argon
BenchmarkClaude Opus 5Gemini 4 ArgonLeader
AA Agentic Index56.5Not measuredOnly Claude Opus 5 measured
Design Arena: agents building web apps1266Not measuredOnly Claude Opus 5 measured
Design Arena: agents building full-stack apps1306Not measuredOnly Claude Opus 5 measured
Design Arena: agents building mobile apps1348Not measuredOnly Claude Opus 5 measured
Design Arena: agents building Android apps1257Not measuredOnly Claude Opus 5 measured
Design Arena: agents building Godot games1279Not measuredOnly Claude Opus 5 measured
Design Arena: agents building games1261Not measuredOnly Claude Opus 5 measured
Design Arena: PowerPoint slides1240Not measuredOnly Claude Opus 5 measured
Design Arena: spreadsheetsNot measured1157Only Gemini 4 Argon measured
LiveBench research88.9%83.1%Claude Opus 5
LiveBench browser84.0%92.0%Gemini 4 Argon
LiveBench long agentic62.1%69.9%Gemini 4 Argon
SREBench (Vals AI)12.2%44.3%Gemini 4 Argon
Finance Agent (Vals AI)58.6%65.4%Gemini 4 Argon
Tax Agent Bench (Vals AI)45.5%44.6%Claude Opus 5
Legal Research Bench (Vals AI)55.3%54.8%Claude Opus 5
Harvey's Legal Agent Benchmark (Vals AI)Not measured27.1%Only Gemini 4 Argon measured
Excel Modeling Benchmark (Vals AI)73.6%75.2%Gemini 4 Argon
BioMysteryBench (Vals AI)79.3%76.3%Claude Opus 5
Terminal-Bench-Science (Vals AI)27.1%44.3%Gemini 4 Argon
Vals Science Index47.9%55.4%Gemini 4 Argon
Time Horizon Index (Vals AI)18.8%52.5%Gemini 4 Argon
CUA-bench (Vals AI)9.0%4.8%Claude Opus 5
Robo-bench (Vals AI)Not measured0.8%Only Gemini 4 Argon measured
APEX-Agents65.8%82.4%Gemini 4 Argon
OSWorld 2.031.4%Not measuredOnly Claude Opus 5 measured
BALROG63.4%Not measuredOnly Claude Opus 5 measured
PostTrainBench35.0%Not measuredOnly Claude Opus 5 measured
Vending-Bench 2$11,182$13,718Gemini 4 Argon
LMArena Search1242Not measuredOnly Claude Opus 5 measured
Neither model has a result on the other 11 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index111
Reasoning benchmarks for Claude Opus 5 and Gemini 4 Argon
BenchmarkClaude Opus 5Gemini 4 ArgonLeader
GPQA Diamond93.4%Not measuredOnly Claude Opus 5 measured
LiveBench reasoning91.2%95.1%Gemini 4 Argon
MysteryMechanism (Vals AI)37.4%45.5%Gemini 4 Argon
MMMU Pro (Vals AI)89.9%Not measuredOnly Claude Opus 5 measured
GPQA Diamond (Artificial Analysis run)93.7%Not measuredOnly Claude Opus 5 measured
Humanity's Last Exam (Artificial Analysis run)54.9%57.1%Gemini 4 Argon
GPQA Diamond (Epoch AI run)93.9%96.4%Gemini 4 Argon
ARC-AGI97.5%98.5%Gemini 4 Argon
ARC-AGI-290.4%91.3%Gemini 4 Argon
SimpleBench80.6%Not measuredOnly Claude Opus 5 measured
Chess puzzles43.0%59.0%Gemini 4 Argon
Mystery game puzzles59.0%64.0%Gemini 4 Argon
EBR-bench45.7%64.8%Gemini 4 Argon
LMArena Text: hard prompts15271546Gemini 4 Argon
LMArena Text: expert15541550Claude Opus 5
LMArena Text: hard prompts in English15231548Gemini 4 Argon
LMArena Vision: diagrams1348Not measuredOnly Claude Opus 5 measured
LMArena Vision: homework1338Not measuredOnly Claude Opus 5 measured
Neither model has a result on the other 4 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index05
Math benchmarks for Claude Opus 5 and Gemini 4 Argon
BenchmarkClaude Opus 5Gemini 4 ArgonLeader
OTIS Mock AIME98.9%100.0%Gemini 4 Argon
FrontierMath, tiers 1 to 385.6%86.0%Gemini 4 Argon
FrontierMath, tier 473.2%78.0%Gemini 4 Argon
ProofBench99.0%99.0%Tie
LMArena Text: math15331536Gemini 4 Argon
LMArena Text: mathematical work15441557Gemini 4 Argon
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index16
Knowledge benchmarks for Claude Opus 5 and Gemini 4 Argon
BenchmarkClaude Opus 5Gemini 4 ArgonLeader
MMLU Pro91.6%Not measuredOnly Claude Opus 5 measured
LegalBench (Vals AI)87.0%88.3%Gemini 4 Argon
CorpFin (Vals AI)73.2%Not measuredOnly Claude Opus 5 measured
TaxEval (Vals AI)75.1%Not measuredOnly Claude Opus 5 measured
MortgageTax (Vals AI)72.1%Not measuredOnly Claude Opus 5 measured
MedCode (Vals AI)63.6%58.8%Claude Opus 5
SimpleQA Verified59.9%76.0%Gemini 4 Argon
LMArena Text: science15311548Gemini 4 Argon
LMArena Text: medicine and healthcare15251555Gemini 4 Argon
LMArena Text: legal and government15301548Gemini 4 Argon
LMArena Text: business and finance15011525Gemini 4 Argon
Neither model has a result on the other 7 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index25
Web design benchmarks for Claude Opus 5 and Gemini 4 Argon
BenchmarkClaude Opus 5Gemini 4 ArgonLeader
Design Arena: websites13091315Gemini 4 Argon
Design Arena: UI components13461333Claude Opus 5
Design Arena: game dev13371377Gemini 4 Argon
Design Arena: data viz13291332Gemini 4 Argon
Design Arena: 3D13341388Gemini 4 Argon
Design Arena: all code categories13231329Gemini 4 Argon
Design Arena: SVG1311Not measuredOnly Claude Opus 5 measured
Design Arena: ASCII art1352Not measuredOnly Claude Opus 5 measured
LiveBench design83.0%73.7%Claude Opus 5
GeneralLike-for-likePublic boards, shown as published, kept out of the index614
General benchmarks for Claude Opus 5 and Gemini 4 Argon
BenchmarkClaude Opus 5Gemini 4 ArgonLeader
Vals IndexNot measured69.2%Only Gemini 4 Argon measured
LiveBench data analysis74.6%85.2%Gemini 4 Argon
Public Benefits Bench (Vals AI)76.9%69.8%Claude Opus 5
SAGE (Vals AI)49.4%53.6%Gemini 4 Argon
MedScribe (Vals AI)91.0%87.4%Claude Opus 5
Vals Multimodal Index73.9%Not measuredOnly Claude Opus 5 measured
Long context reasoning (AA-LCR)82.0%79.7%Claude Opus 5
DTBench97.9%97.6%Claude Opus 5
LMCA64.5%63.7%Claude Opus 5
Furniture assembly60.8%72.5%Gemini 4 Argon
LMArena Text15091532Gemini 4 Argon
LMArena Text: instruction following15181534Gemini 4 Argon
LMArena Text: creative writing14931527Gemini 4 Argon
LMArena Vision1320Not measuredOnly Claude Opus 5 measured
LMArena Text: English15081538Gemini 4 Argon
LMArena Text: non-English15021522Gemini 4 Argon
LMArena Text: Chinese15731611Gemini 4 Argon
LMArena Text: German1527Not measuredOnly Claude Opus 5 measured
LMArena Text: Japanese1520Not measuredOnly Claude Opus 5 measured
LMArena Text: Korean1517Not measuredOnly Claude Opus 5 measured
LMArena Text: French1519Not measuredOnly Claude Opus 5 measured
LMArena Text: Spanish15231503Claude Opus 5
LMArena Text: Russian15071534Gemini 4 Argon
LMArena Text: Polish1522Not measuredOnly Claude Opus 5 measured
LMArena Text: multi-turn15001556Gemini 4 Argon
LMArena Text: longer queries15171547Gemini 4 Argon
LMArena Text: writing and language14991529Gemini 4 Argon
LMArena Text: entertainment and media14811527Gemini 4 Argon
LMArena Vision: English1315Not measuredOnly Claude Opus 5 measured
LMArena Vision: Chinese1400Not measuredOnly Claude Opus 5 measured
LMArena Vision: reading text1329Not measuredOnly Claude Opus 5 measured
LMArena Vision: humor1293Not measuredOnly Claude Opus 5 measured
LMArena Vision: creative writing1313Not measuredOnly Claude Opus 5 measured
LMArena Document1516Not measuredOnly Claude Opus 5 measured
Neither model has a result on the other 12 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Claude Opus 5 and Gemini 4 Argon
BenchmarkClaude Opus 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 Opus 5$0.018Fits in one request
Gemini 4 Argon$0.0070Fits in one request

Gemini 4 Argon costs less

Repository review

50K input + 3K output tokens

Claude Opus 5$0.325Fits in one request
Gemini 4 Argon$0.130Fits in one request

Gemini 4 Argon costs less

Agent loop

200K input + 10K output tokens

Claude Opus 5$1.25Fits 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 Opus 5 and Gemini 4 Argon
SpecificationAnthropic Claude Opus 5Google Gemini 4 Argon
MakerAnthropicGoogle
WeightsNo public weights listedNo public weights listed
ReleasedJuly 24, 2026October 13, 2026
Context window1M1.05M
Input $/Mtok$5.00$2.00
Output $/Mtok$25.00$10.00
Coding index83.081.0
Independent measurements behind it65
Cost per solved task$1.33Not computable
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Opus 5 better than Gemini 4 Argon for coding?

Pick Claude Opus 5 for coding: it scores 83.0 on the Vibe Coding Index against 81.0 for Gemini 4 Argon. Pick Gemini 4 Argon for output tokens 2.5x cheaper ($10.00 vs $25.00 per million) and a larger context window (1.05M against 1M tokens).

Which is cheaper, Claude Opus 5 or Gemini 4 Argon?

Claude Opus 5 costs $5.00 per million input tokens and $25.00 per million output tokens; Gemini 4 Argon costs $2.00 and $10.00. Cost per solved task is known for Claude Opus 5 only.

Which has the bigger context window, Claude Opus 5 or Gemini 4 Argon?

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

How many benchmarks is the Claude Opus 5 vs Gemini 4 Argon comparison based on?

88 benchmarks have a result for both models as of October 22, 2026. Claude Opus 5's coding index rests on 6 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-opus-5-vs-gemini-4-argon">LLMBenchmark.ai, Claude Opus 5 vs Gemini 4 Argon</a></p>