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Claude Fable 5.1 vs Gemini 4 Argon

Claude Fable 5.1 leads Gemini 4 Argon on coding, 84.2 to 81.0 on the Vibe Coding Index, and Gemini 4 Argon costs 5.0x less per output token ($10.00 vs $50.00 per million). Updated October 22, 2026; 88 benchmarks have a result for both.

Replace Claude Fable 5.1 Replace Gemini 4 Argon
Claude Fable 5.1Anthropic
Coding
84.2
Overall
84.7
Output $/M
$50.00
42
Gemini 4 ArgonGoogle
Coding
81.0
Overall
84.0
Output $/M
$10.00
44
vs boards won of 88 shared, 2 tied

Claude Fable 5.1 or Gemini 4 Argon: which to pick

Pick Claude Fable 5.1 for coding: it scores 84.2 on the Vibe Coding Index against 81.0 for Gemini 4 Argon.

Pick Gemini 4 Argon for output tokens 5.0x cheaper ($10.00 vs $50.00 per million) and a larger context window (1.05M against 1M tokens).

Model AClaude Fable 5.1Anthropic84.2/1005 independent benchmarksNo cost per solved taskModel BGemini 4 ArgonGoogle81.0/1005 independent benchmarksNo cost per solved task
Shared results
88
Claude Fable 5.1 only
36
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 Fable 5.1 84.2 from 5 benchmarks, Gemini 4 Argon 81.0 from 5 benchmarks.
Widest category
Agentic work, 11.8 points apart on average over 15 shared benchmarks.
Widest single gap
Vending-Bench 2: Claude Fable 5.1 $5,422 against Gemini 4 Argon $13,718, 51.9 points apart on a 0 to 100 scale.
Output price
Claude Fable 5.1 $50.00 against Gemini 4 Argon $10.00 per million output tokens, 5.0x apart.
Context window
Claude Fable 5.1 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 Fable 5.1BarsGemini 4 ArgonTies
Coding146
Intelligence20
Agentic work96
Reasoning29
Math321 tie
Knowledge16
Web design61
General5141 tie
All shared boards42442 ties
CodingLike-for-likeSix of these boards feed the Vibe Coding Index146
Coding benchmarks for Claude Fable 5.1 and Gemini 4 Argon
BenchmarkClaude Fable 5.1Gemini 4 ArgonLeader
LiveBench coding97.7%89.7%Claude Fable 5.1
LMArena WebDev17431678Claude Fable 5.1
AA Coding Index81.6Not measuredOnly Claude Fable 5.1 measured
LiveCodeBench (Vals AI)90.5%Not measuredOnly Claude Fable 5.1 measured
Terminal-Bench 4 (Vals AI)58.1%57.6%Claude Fable 5.1
Vibe Code Bench (Vals AI)90.3%91.9%Gemini 4 Argon
Code migration (Vals AI)54.6%68.2%Gemini 4 Argon
ProgramBench (Vals AI)7.0%2.5%Claude Fable 5.1
IOI (Vals AI)90.8%100.0%Gemini 4 Argon
Terminal-Bench 2.1 (Vals AI)85.0%57.7%Claude Fable 5.1
SWE-bench Multimodal (Vals AI)61.3%56.0%Claude Fable 5.1
Vibe Code Bench 1-100 (Vals AI)28.0%21.2%Claude Fable 5.1
SkillsBench (Vals AI)61.5%Not measuredOnly Claude Fable 5.1 measured
CyberBench (Vals AI)70.4%77.9%Gemini 4 Argon
SciCode63.1%61.8%Claude Fable 5.1
FrontierCode50.9%47.5%Claude Fable 5.1
FrontierSWE56.3%55.0%Claude Fable 5.1
GSO-Bench88.2%Not measuredOnly Claude Fable 5.1 measured
WeirdML92.9%Not measuredOnly Claude Fable 5.1 measured
MirrorCode73.3%58.9%Claude Fable 5.1
ALE-Bench2143.22100.1Claude Fable 5.1
LMArena Text: coding15321546Gemini 4 Argon
LMArena Text: software and IT15301556Gemini 4 Argon
LMArena WebDev: React17921692Claude Fable 5.1
LMArena WebDev: HTML16841643Claude Fable 5.1
LMArena WebDev: from an image1722Not measuredOnly Claude Fable 5.1 measured
SciCodeNot measured12.3%Only Gemini 4 Argon measured
Neither model has a result on the other 12 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Fable 5.1 and Gemini 4 Argon
BenchmarkClaude Fable 5.1Gemini 4 ArgonLeader
AA Intelligence Index53.452.6Claude Fable 5.1
Epoch Capabilities Index166.5166.4Claude Fable 5.1
Agentic workLike-for-likePublic boards, shown as published, kept out of the index96
Agentic work benchmarks for Claude Fable 5.1 and Gemini 4 Argon
BenchmarkClaude Fable 5.1Gemini 4 ArgonLeader
AA Agentic Index57.9Not measuredOnly Claude Fable 5.1 measured
Design Arena: agents building web apps1318Not measuredOnly Claude Fable 5.1 measured
Design Arena: agents building full-stack apps1326Not measuredOnly Claude Fable 5.1 measured
Design Arena: agents building mobile apps1267Not measuredOnly Claude Fable 5.1 measured
Design Arena: agents building Godot games1327Not measuredOnly Claude Fable 5.1 measured
Design Arena: PowerPoint slides1305Not measuredOnly Claude Fable 5.1 measured
Design Arena: spreadsheets13801157Claude Fable 5.1
LiveBench research82.0%83.1%Gemini 4 Argon
LiveBench browser100.0%92.0%Claude Fable 5.1
LiveBench long agentic80.8%69.9%Claude Fable 5.1
SREBench (Vals AI)22.9%44.3%Gemini 4 Argon
Finance Agent (Vals AI)58.9%65.4%Gemini 4 Argon
Tax Agent Bench (Vals AI)49.2%44.6%Claude Fable 5.1
Legal Research Bench (Vals AI)55.3%54.8%Claude Fable 5.1
Harvey's Legal Agent Benchmark (Vals AI)Not measured27.1%Only Gemini 4 Argon measured
Excel Modeling Benchmark (Vals AI)76.7%75.2%Claude Fable 5.1
BioMysteryBench (Vals AI)Not measured76.3%Only Gemini 4 Argon measured
Terminal-Bench-Science (Vals AI)40.0%44.3%Gemini 4 Argon
Vals Science IndexNot measured55.4%Only Gemini 4 Argon measured
Time Horizon Index (Vals AI)63.3%52.5%Claude Fable 5.1
CUA-bench (Vals AI)13.2%4.8%Claude Fable 5.1
Robo-bench (Vals AI)5.8%0.8%Claude Fable 5.1
APEX-Agents68.6%82.4%Gemini 4 Argon
Remote Labor Index17.9%Not measuredOnly Claude Fable 5.1 measured
SpireClimb2.0%Not measuredOnly Claude Fable 5.1 measured
Vending-Bench 2$5,422$13,718Gemini 4 Argon
LMArena Search1246Not measuredOnly Claude Fable 5.1 measured
Neither model has a result on the other 14 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index29
Reasoning benchmarks for Claude Fable 5.1 and Gemini 4 Argon
BenchmarkClaude Fable 5.1Gemini 4 ArgonLeader
GPQA Diamond93.4%Not measuredOnly Claude Fable 5.1 measured
LiveBench reasoning91.7%95.1%Gemini 4 Argon
MysteryMechanism (Vals AI)47.8%45.5%Claude Fable 5.1
MMMU Pro (Vals AI)90.6%Not measuredOnly Claude Fable 5.1 measured
GPQA Diamond (Artificial Analysis run)93.7%Not measuredOnly Claude Fable 5.1 measured
Humanity's Last Exam (Artificial Analysis run)59.1%57.1%Claude Fable 5.1
GPQA Diamond (Epoch AI run)Not measured96.4%Only Gemini 4 Argon measured
ARC-AGI97.5%98.5%Gemini 4 Argon
ARC-AGI-290.0%91.3%Gemini 4 Argon
Chess puzzles48.0%59.0%Gemini 4 Argon
Mystery game puzzles58.0%64.0%Gemini 4 Argon
EBR-bench57.1%64.8%Gemini 4 Argon
LMArena Text: hard prompts15281546Gemini 4 Argon
LMArena Text: expert15441550Gemini 4 Argon
LMArena Text: hard prompts in English15221548Gemini 4 Argon
LMArena Vision: diagrams1343Not measuredOnly Claude Fable 5.1 measured
LMArena Vision: homework1345Not measuredOnly Claude Fable 5.1 measured
Neither model has a result on the other 5 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index32
Math benchmarks for Claude Fable 5.1 and Gemini 4 Argon
BenchmarkClaude Fable 5.1Gemini 4 ArgonLeader
OTIS Mock AIME100.0%100.0%Tie
FrontierMath, tiers 1 to 390.2%86.0%Claude Fable 5.1
FrontierMath, tier 487.8%78.0%Claude Fable 5.1
ProofBench100.0%99.0%Claude Fable 5.1
LMArena Text: math15311536Gemini 4 Argon
LMArena Text: mathematical work15411557Gemini 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 Fable 5.1 and Gemini 4 Argon
BenchmarkClaude Fable 5.1Gemini 4 ArgonLeader
MMLU Pro92.4%Not measuredOnly Claude Fable 5.1 measured
LegalBench (Vals AI)88.5%88.3%Claude Fable 5.1
TaxEval (Vals AI)76.0%Not measuredOnly Claude Fable 5.1 measured
MortgageTax (Vals AI)70.8%Not measuredOnly Claude Fable 5.1 measured
MedCode (Vals AI)53.5%58.8%Gemini 4 Argon
SimpleQA Verified70.8%76.0%Gemini 4 Argon
LMArena Text: science15321548Gemini 4 Argon
LMArena Text: medicine and healthcare15311555Gemini 4 Argon
LMArena Text: legal and government15141548Gemini 4 Argon
LMArena Text: business and finance14931525Gemini 4 Argon
Neither model has a result on the other 8 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index61
Web design benchmarks for Claude Fable 5.1 and Gemini 4 Argon
BenchmarkClaude Fable 5.1Gemini 4 ArgonLeader
Design Arena: websites13121315Gemini 4 Argon
Design Arena: UI components13361333Claude Fable 5.1
Design Arena: game dev13811377Claude Fable 5.1
Design Arena: data viz13441332Claude Fable 5.1
Design Arena: 3D13921388Claude Fable 5.1
Design Arena: all code categories13351329Claude Fable 5.1
Design Arena: SVG1300Not measuredOnly Claude Fable 5.1 measured
Design Arena: ASCII art1323Not measuredOnly Claude Fable 5.1 measured
LiveBench design83.4%73.7%Claude Fable 5.1
GeneralLike-for-likePublic boards, shown as published, kept out of the index514
General benchmarks for Claude Fable 5.1 and Gemini 4 Argon
BenchmarkClaude Fable 5.1Gemini 4 ArgonLeader
Vals IndexNot measured69.2%Only Gemini 4 Argon measured
LiveBench data analysis80.3%85.2%Gemini 4 Argon
Public Benefits Bench (Vals AI)74.9%69.8%Claude Fable 5.1
SAGE (Vals AI)48.5%53.6%Gemini 4 Argon
MedScribe (Vals AI)91.3%87.4%Claude Fable 5.1
Long context reasoning (AA-LCR)85.3%79.7%Claude Fable 5.1
DTBench97.6%97.6%Tie
LMCA65.5%63.7%Claude Fable 5.1
Furniture assembly70.0%72.5%Gemini 4 Argon
LMArena Text15121532Gemini 4 Argon
LMArena Text: instruction following15181534Gemini 4 Argon
LMArena Text: creative writing15091527Gemini 4 Argon
LMArena Vision1319Not measuredOnly Claude Fable 5.1 measured
LMArena Text: English15061538Gemini 4 Argon
LMArena Text: non-English15081522Gemini 4 Argon
LMArena Text: Chinese15841611Gemini 4 Argon
LMArena Text: German1499Not measuredOnly Claude Fable 5.1 measured
LMArena Text: Japanese1562Not measuredOnly Claude Fable 5.1 measured
LMArena Text: Korean1517Not measuredOnly Claude Fable 5.1 measured
LMArena Text: French1523Not measuredOnly Claude Fable 5.1 measured
LMArena Text: Spanish15201503Claude Fable 5.1
LMArena Text: Russian15201534Gemini 4 Argon
LMArena Text: Polish1525Not measuredOnly Claude Fable 5.1 measured
LMArena Text: multi-turn14931556Gemini 4 Argon
LMArena Text: longer queries15241547Gemini 4 Argon
LMArena Text: writing and language15101529Gemini 4 Argon
LMArena Text: entertainment and media14971527Gemini 4 Argon
LMArena Vision: English1313Not measuredOnly Claude Fable 5.1 measured
LMArena Vision: Chinese1391Not measuredOnly Claude Fable 5.1 measured
LMArena Vision: reading text1327Not measuredOnly Claude Fable 5.1 measured
LMArena Vision: humor1318Not measuredOnly Claude Fable 5.1 measured
LMArena Vision: creative writing1330Not measuredOnly Claude Fable 5.1 measured
Neither model has a result on the other 14 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Claude Fable 5.1 and Gemini 4 Argon
BenchmarkClaude Fable 5.1Gemini 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 Fable 5.1$0.035Fits in one request
Gemini 4 Argon$0.0070Fits in one request

Gemini 4 Argon costs less

Repository review

50K input + 3K output tokens

Claude Fable 5.1$0.650Fits in one request
Gemini 4 Argon$0.130Fits in one request

Gemini 4 Argon costs less

Agent loop

200K input + 10K output tokens

Claude Fable 5.1$2.50Fits 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 Fable 5.1 and Gemini 4 Argon
SpecificationAnthropic Claude Fable 5.1Google Gemini 4 Argon
MakerAnthropicGoogle
WeightsNo public weights listedNo public weights listed
ReleasedSeptember 1, 2026October 13, 2026
Context window1M1.05M
Input $/Mtok$10.00$2.00
Output $/Mtok$50.00$10.00
Coding index84.281.0
Independent measurements behind it55
Cost per solved taskNot computableNot computable
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Fable 5.1 better than Gemini 4 Argon for coding?

Pick Claude Fable 5.1 for coding: it scores 84.2 on the Vibe Coding Index against 81.0 for Gemini 4 Argon. Pick Gemini 4 Argon for output tokens 5.0x cheaper ($10.00 vs $50.00 per million) and a larger context window (1.05M against 1M tokens).

Which is cheaper, Claude Fable 5.1 or Gemini 4 Argon?

Claude Fable 5.1 costs $10.00 per million input tokens and $50.00 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 Fable 5.1 or Gemini 4 Argon?

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

How many benchmarks is the Claude Fable 5.1 vs Gemini 4 Argon comparison based on?

88 benchmarks have a result for both models as of October 22, 2026. Claude Fable 5.1'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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