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Claude Opus 4.8 vs Gemini 4 Argon

Gemini 4 Argon leads Claude Opus 4.8 on coding, 81.0 to 65.0 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; 79 benchmarks have a result for both.

Replace Claude Opus 4.8 Replace Gemini 4 Argon
Claude Opus 4.8Anthropic
Coding
65.0
Overall
69.8
Output $/M
$25.00
5
Gemini 4 ArgonGoogle
Coding
81.0
Overall
84.0
Output $/M
$10.00
73
vs boards won of 79 shared, 1 tied

Claude Opus 4.8 or Gemini 4 Argon: which to pick

Pick Gemini 4 Argon for coding: it scores 81.0 on the Vibe Coding Index against 65.0 for Claude Opus 4.8, though on 5 benchmarks against 6.

Pick Claude Opus 4.8 for work measured by Terminal-Bench 2.1 (Vals AI) or Design Arena: spreadsheets, where it leads.

Model AClaude Opus 4.8Anthropic65.0/1006 independent benchmarks$2.17 per solved taskModel BGemini 4 ArgonGoogle81.0/1005 independent benchmarksNo cost per solved task
Shared results
79
Claude Opus 4.8 only
51
Gemini 4 Argon only
15
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 4.8 65.0 from 6 benchmarks, Gemini 4 Argon 81.0 from 5 benchmarks.
Widest category
Agentic work, 21.0 points apart on average over 12 shared benchmarks.
Widest single gap
Vending-Bench 2: Claude Opus 4.8 $5,787 against Gemini 4 Argon $13,718, 49.6 points apart on a 0 to 100 scale.
Output price
Claude Opus 4.8 $25.00 against Gemini 4 Argon $10.00 per million output tokens, 2.5x apart.
Context window
Claude Opus 4.8 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 4.8BarsGemini 4 ArgonTies
Coding1121 tie
Intelligence02
Agentic work210
Reasoning011
Math06
Knowledge07
Web design16
General119
All shared boards5731 tie
CodingLike-for-likeSix of these boards feed the Vibe Coding Index112
Coding benchmarks for Claude Opus 4.8 and Gemini 4 Argon
BenchmarkClaude Opus 4.8Gemini 4 ArgonLeader
LiveBench coding77.3%89.7%Gemini 4 Argon
LMArena WebDev15561678Gemini 4 Argon
AA Coding Index74.3Not measuredOnly Claude Opus 4.8 measured
LiveCodeBench (Vals AI)87.8%Not measuredOnly Claude Opus 4.8 measured
SWE-bench Verified (Vals AI)88.6%Not measuredOnly Claude Opus 4.8 measured
Terminal-Bench 4 (Vals AI)23.2%57.6%Gemini 4 Argon
Vibe Code Bench (Vals AI)82.7%91.9%Gemini 4 Argon
Code migration (Vals AI)47.3%68.2%Gemini 4 Argon
ProgramBench (Vals AI)1.0%2.5%Gemini 4 Argon
IOI (Vals AI)Not measured100.0%Only Gemini 4 Argon measured
Terminal-Bench 2.1 (Vals AI)71.9%57.7%Claude Opus 4.8
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
SkillsBench (Vals AI)59.2%Not measuredOnly Claude Opus 4.8 measured
CyberBench (Vals AI)Not measured77.9%Only Gemini 4 Argon measured
SciCode54.4%61.8%Gemini 4 Argon
Terminal-Bench Hard (Artificial Analysis run)58.3%Not measuredOnly Claude Opus 4.8 measured
FrontierCode46.5%47.5%Gemini 4 Argon
FrontierSWENot measured55.0%Only Gemini 4 Argon measured
GSO-Bench47.1%Not measuredOnly Claude Opus 4.8 measured
WeirdML82.9%Not measuredOnly Claude Opus 4.8 measured
MirrorCodeNot measured58.9%Only Gemini 4 Argon measured
ALE-BenchNot measured2100.1Only Gemini 4 Argon measured
LMArena Text: coding14901546Gemini 4 Argon
LMArena Text: software and IT14881556Gemini 4 Argon
LMArena WebDev: React15571692Gemini 4 Argon
LMArena WebDev: HTML15431643Gemini 4 Argon
SciCode12.3%12.3%Tie
Neither model has a result on the other 11 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
Intelligence benchmarks for Claude Opus 4.8 and Gemini 4 Argon
BenchmarkClaude Opus 4.8Gemini 4 ArgonLeader
AA Intelligence Index41.852.6Gemini 4 Argon
Epoch Capabilities Index159.0166.4Gemini 4 Argon
Agentic workLike-for-likePublic boards, shown as published, kept out of the index210
Agentic work benchmarks for Claude Opus 4.8 and Gemini 4 Argon
BenchmarkClaude Opus 4.8Gemini 4 ArgonLeader
AA Agentic Index41.9Not measuredOnly Claude Opus 4.8 measured
Design Arena: agents building web apps1233Not measuredOnly Claude Opus 4.8 measured
Design Arena: agents building full-stack apps1249Not measuredOnly Claude Opus 4.8 measured
Design Arena: agents building mobile apps1222Not measuredOnly Claude Opus 4.8 measured
Design Arena: agents building Android apps1233Not measuredOnly Claude Opus 4.8 measured
Design Arena: agents building Godot games1231Not measuredOnly Claude Opus 4.8 measured
Design Arena: agents building games1239Not measuredOnly Claude Opus 4.8 measured
Design Arena: HTML slides1171Not measuredOnly Claude Opus 4.8 measured
Design Arena: PowerPoint slides1202Not measuredOnly Claude Opus 4.8 measured
Design Arena: spreadsheets13031157Claude Opus 4.8
LiveBench research81.8%83.1%Gemini 4 Argon
LiveBench browser96.0%92.0%Claude Opus 4.8
LiveBench long agentic48.3%69.9%Gemini 4 Argon
SREBench (Vals AI)Not measured44.3%Only Gemini 4 Argon measured
Finance Agent (Vals AI)53.9%65.4%Gemini 4 Argon
Tax Agent Bench (Vals AI)30.0%44.6%Gemini 4 Argon
Legal Research Bench (Vals AI)43.8%54.8%Gemini 4 Argon
Harvey's Legal Agent Benchmark (Vals AI)Not measured27.1%Only Gemini 4 Argon measured
Excel Modeling Benchmark (Vals AI)69.4%75.2%Gemini 4 Argon
BioMysteryBench (Vals AI)Not measured76.3%Only Gemini 4 Argon measured
Terminal-Bench-Science (Vals AI)4.3%44.3%Gemini 4 Argon
Vals Science IndexNot measured55.4%Only Gemini 4 Argon measured
Time Horizon Index (Vals AI)11.8%52.5%Gemini 4 Argon
CUA-bench (Vals AI)Not measured4.8%Only Gemini 4 Argon measured
Robo-bench (Vals AI)Not measured0.8%Only Gemini 4 Argon measured
τ²-Bench Telecom94.4%Not measuredOnly Claude Opus 4.8 measured
APEX-Agents48.9%82.4%Gemini 4 Argon
Remote Labor Index8.3%Not measuredOnly Claude Opus 4.8 measured
OSWorld 2.020.6%Not measuredOnly Claude Opus 4.8 measured
DeepResearch Bench50.2%Not measuredOnly Claude Opus 4.8 measured
PostTrainBench33.8%Not measuredOnly Claude Opus 4.8 measured
Vending-Bench 2$5,787$13,718Gemini 4 Argon
LMArena Search1204Not measuredOnly Claude Opus 4.8 measured
Neither model has a result on the other 8 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index011
Reasoning benchmarks for Claude Opus 4.8 and Gemini 4 Argon
BenchmarkClaude Opus 4.8Gemini 4 ArgonLeader
GPQA Diamond92.4%Not measuredOnly Claude Opus 4.8 measured
LiveBench reasoning89.2%95.1%Gemini 4 Argon
MysteryMechanism (Vals AI)Not measured45.5%Only Gemini 4 Argon measured
MMMU Pro (Vals AI)86.6%Not measuredOnly Claude Opus 4.8 measured
GPQA Diamond (Artificial Analysis run)92.0%Not measuredOnly Claude Opus 4.8 measured
Humanity's Last Exam (Artificial Analysis run)48.7%57.1%Gemini 4 Argon
GPQA Diamond (Epoch AI run)91.0%96.4%Gemini 4 Argon
ARC-AGI92.5%98.5%Gemini 4 Argon
ARC-AGI-272.1%91.3%Gemini 4 Argon
SimpleBench64.8%Not measuredOnly Claude Opus 4.8 measured
Chess puzzles52.0%59.0%Gemini 4 Argon
Mystery game puzzles36.0%64.0%Gemini 4 Argon
EBR-bench28.6%64.8%Gemini 4 Argon
LMArena Text: hard prompts14821546Gemini 4 Argon
LMArena Text: expert15031550Gemini 4 Argon
LMArena Text: hard prompts in English14871548Gemini 4 Argon
LMArena Vision: diagrams1315Not measuredOnly Claude Opus 4.8 measured
LMArena Vision: homework1337Not measuredOnly Claude Opus 4.8 measured
Kagi LLM Benchmark88.8%Not measuredOnly Claude Opus 4.8 measured
Neither model has a result on the other 3 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index06
Math benchmarks for Claude Opus 4.8 and Gemini 4 Argon
BenchmarkClaude Opus 4.8Gemini 4 ArgonLeader
OTIS Mock AIME98.3%100.0%Gemini 4 Argon
FrontierMath, tiers 1 to 380.0%86.0%Gemini 4 Argon
FrontierMath, tier 456.1%78.0%Gemini 4 Argon
ProofBench69.0%99.0%Gemini 4 Argon
LMArena Text: math14861536Gemini 4 Argon
LMArena Text: mathematical work14971557Gemini 4 Argon
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index07
Knowledge benchmarks for Claude Opus 4.8 and Gemini 4 Argon
BenchmarkClaude Opus 4.8Gemini 4 ArgonLeader
MMLU Pro89.6%Not measuredOnly Claude Opus 4.8 measured
LegalBench (Vals AI)83.6%88.3%Gemini 4 Argon
CorpFin (Vals AI)66.7%Not measuredOnly Claude Opus 4.8 measured
TaxEval (Vals AI)75.6%Not measuredOnly Claude Opus 4.8 measured
MortgageTax (Vals AI)69.9%Not measuredOnly Claude Opus 4.8 measured
MedCode (Vals AI)53.2%58.8%Gemini 4 Argon
SimpleQA Verified53.0%76.0%Gemini 4 Argon
LMArena Text: science14771548Gemini 4 Argon
LMArena Text: medicine and healthcare14641555Gemini 4 Argon
LMArena Text: legal and government14771548Gemini 4 Argon
LMArena Text: business and finance14581525Gemini 4 Argon
FACTS Benchmark Suite53.5%Not measuredOnly Claude Opus 4.8 measured
Neither model has a result on the other 6 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index16
Web design benchmarks for Claude Opus 4.8 and Gemini 4 Argon
BenchmarkClaude Opus 4.8Gemini 4 ArgonLeader
Design Arena: websites12581315Gemini 4 Argon
Design Arena: UI components12551333Gemini 4 Argon
Design Arena: game dev12641377Gemini 4 Argon
Design Arena: data viz12401332Gemini 4 Argon
Design Arena: 3D12221388Gemini 4 Argon
Design Arena: all code categories12551329Gemini 4 Argon
Design Arena: SVG1195Not measuredOnly Claude Opus 4.8 measured
Design Arena: ASCII art1277Not measuredOnly Claude Opus 4.8 measured
LiveBench design78.8%73.7%Claude Opus 4.8
GeneralLike-for-likePublic boards, shown as published, kept out of the index119
General benchmarks for Claude Opus 4.8 and Gemini 4 Argon
BenchmarkClaude Opus 4.8Gemini 4 ArgonLeader
Vals IndexNot measured69.2%Only Gemini 4 Argon measured
LiveBench data analysis66.0%85.2%Gemini 4 Argon
Public Benefits Bench (Vals AI)68.1%69.8%Gemini 4 Argon
SAGE (Vals AI)54.8%53.6%Claude Opus 4.8
MedScribe (Vals AI)85.8%87.4%Gemini 4 Argon
Vals Multimodal Index70.9%Not measuredOnly Claude Opus 4.8 measured
IFBench62.2%Not measuredOnly Claude Opus 4.8 measured
Long context reasoning (AA-LCR)77.7%79.7%Gemini 4 Argon
DTBench94.9%97.6%Gemini 4 Argon
LMCA57.5%63.7%Gemini 4 Argon
Surface Evolver Bench87.5%Not measuredOnly Claude Opus 4.8 measured
Furniture assembly42.5%72.5%Gemini 4 Argon
LMArena Text14611532Gemini 4 Argon
LMArena Text: instruction following14761534Gemini 4 Argon
LMArena Text: creative writing14541527Gemini 4 Argon
LMArena Vision1294Not measuredOnly Claude Opus 4.8 measured
LMArena Text: English14681538Gemini 4 Argon
LMArena Text: non-English14501522Gemini 4 Argon
LMArena Text: Chinese15061611Gemini 4 Argon
LMArena Text: German1472Not measuredOnly Claude Opus 4.8 measured
LMArena Text: Japanese1442Not measuredOnly Claude Opus 4.8 measured
LMArena Text: Korean1431Not measuredOnly Claude Opus 4.8 measured
LMArena Text: French1481Not measuredOnly Claude Opus 4.8 measured
LMArena Text: Spanish14651503Gemini 4 Argon
LMArena Text: Russian14741534Gemini 4 Argon
LMArena Text: Polish1459Not measuredOnly Claude Opus 4.8 measured
LMArena Text: multi-turn14761556Gemini 4 Argon
LMArena Text: longer queries14831547Gemini 4 Argon
LMArena Text: writing and language14611529Gemini 4 Argon
LMArena Text: entertainment and media14401527Gemini 4 Argon
LMArena Vision: English1293Not measuredOnly Claude Opus 4.8 measured
LMArena Vision: Chinese1346Not measuredOnly Claude Opus 4.8 measured
LMArena Vision: reading text1303Not measuredOnly Claude Opus 4.8 measured
LMArena Vision: humor1282Not measuredOnly Claude Opus 4.8 measured
LMArena Vision: creative writing1301Not measuredOnly Claude Opus 4.8 measured
LMArena Document1475Not measuredOnly Claude Opus 4.8 measured
Neither model has a result on the other 10 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Claude Opus 4.8 and Gemini 4 Argon
BenchmarkClaude Opus 4.8Gemini 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 4.8$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 4.8$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 4.8$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 4.8 and Gemini 4 Argon
SpecificationAnthropic Claude Opus 4.8Google Gemini 4 Argon
MakerAnthropicGoogle
WeightsNo public weights listedNo public weights listed
ReleasedMay 27, 2026October 13, 2026
Context window1M1.05M
Input $/Mtok$5.00$2.00
Output $/Mtok$25.00$10.00
Coding index65.081.0
Independent measurements behind it65
Cost per solved task$2.17Not computable
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Opus 4.8 better than Gemini 4 Argon for coding?

Pick Gemini 4 Argon for coding: it scores 81.0 on the Vibe Coding Index against 65.0 for Claude Opus 4.8, though on 5 benchmarks against 6. Pick Claude Opus 4.8 for work measured by Terminal-Bench 2.1 (Vals AI) or Design Arena: spreadsheets, where it leads.

Which is cheaper, Claude Opus 4.8 or Gemini 4 Argon?

Claude Opus 4.8 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 4.8 only.

Which has the bigger context window, Claude Opus 4.8 or Gemini 4 Argon?

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

How many benchmarks is the Claude Opus 4.8 vs Gemini 4 Argon comparison based on?

79 benchmarks have a result for both models as of October 22, 2026. Claude Opus 4.8'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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