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Claude Fable 5 vs Gemini 4 Argon

Gemini 4 Argon leads Claude Fable 5 on coding, 81.0 to 79.3 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 21, 2026; 78 benchmarks have a result for both.

Replace Claude Fable 5 Replace Gemini 4 Argon
Claude Fable 5Anthropic
Coding
79.3
Overall
79.0
Output $/M
$50.00
13
Gemini 4 ArgonGoogle
Coding
81.0
Overall
84.0
Output $/M
$10.00
62
vs boards won of 78 shared, 3 tied

Claude Fable 5 or Gemini 4 Argon: which to pick

Claude Fable 5 and Gemini 4 Argon are level for coding, 79.3 against 81.0 on the Vibe Coding Index, so price and context decide.

Pick Claude Fable 5 for work measured by LiveBench coding or Terminal-Bench 2.1 (Vals AI), where it leads. 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 5Anthropic79.3/1006 independent benchmarks$2.16 per solved taskModel BGemini 4 ArgonGoogle81.0/1005 independent benchmarksNo cost per solved task
Shared results
78
Claude Fable 5 only
49
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 Fable 5 79.3 from 6 benchmarks, Gemini 4 Argon 81.0 from 5 benchmarks.
Widest category
Agentic work, 14.0 points apart on average over 10 shared benchmarks.
Widest single gap
Vending-Bench 2: Claude Fable 5 $5,680 against Gemini 4 Argon $13,718, 50.2 points apart on a 0 to 100 scale.
Output price
Claude Fable 5 $50.00 against Gemini 4 Argon $10.00 per million output tokens, 5.0x apart.
Context window
Claude Fable 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 Fable 5BarsGemini 4 ArgonTies
Coding411
Intelligence02
Agentic work181 tie
Reasoning0101 tie
Math231 tie
Knowledge16
Web design16
General416
All shared boards13623 ties
CodingLike-for-likeSix of these boards feed the Vibe Coding Index411
Coding benchmarks for Claude Fable 5 and Gemini 4 Argon
BenchmarkClaude Fable 5Gemini 4 ArgonLeader
LiveBench coding98.3%89.7%Claude Fable 5
LMArena WebDev16241678Gemini 4 Argon
AA Coding Index76.5Not measuredOnly Claude Fable 5 measured
LiveCodeBench (Vals AI)89.8%Not measuredOnly Claude Fable 5 measured
SWE-bench Verified (Vals AI)95.0%Not measuredOnly Claude Fable 5 measured
Terminal-Bench 4 (Vals AI)41.4%57.6%Gemini 4 Argon
Vibe Code Bench (Vals AI)90.3%91.9%Gemini 4 Argon
Code migration (Vals AI)55.1%68.2%Gemini 4 Argon
ProgramBench (Vals AI)2.0%2.5%Gemini 4 Argon
IOI (Vals AI)Not measured100.0%Only Gemini 4 Argon measured
Terminal-Bench 2.1 (Vals AI)80.5%57.7%Claude Fable 5
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
SciCode61.0%61.8%Gemini 4 Argon
Terminal-Bench Hard (Artificial Analysis run)62.9%Not measuredOnly Claude Fable 5 measured
FrontierCode53.5%47.5%Claude Fable 5
FrontierSWE47.0%55.0%Gemini 4 Argon
GSO-Bench78.4%Not measuredOnly Claude Fable 5 measured
WeirdML91.9%Not measuredOnly Claude Fable 5 measured
MirrorCode63.9%Not measuredOnly Claude Fable 5 measured
ALE-Bench2041.32100.1Gemini 4 Argon
LMArena Text: coding15181546Gemini 4 Argon
LMArena Text: software and IT15131556Gemini 4 Argon
LMArena WebDev: React16311692Gemini 4 Argon
LMArena WebDev: HTML16511643Claude Fable 5
LMArena WebDev: from an image1623Not measuredOnly Claude Fable 5 measured
SciCodeNot measured12.3%Only Gemini 4 Argon measured
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 Fable 5 and Gemini 4 Argon
BenchmarkClaude Fable 5Gemini 4 ArgonLeader
AA Intelligence Index49.652.6Gemini 4 Argon
Epoch Capabilities Index163.4166.4Gemini 4 Argon
Agentic workLike-for-likePublic boards, shown as published, kept out of the index18
Agentic work benchmarks for Claude Fable 5 and Gemini 4 Argon
BenchmarkClaude Fable 5Gemini 4 ArgonLeader
AA Agentic Index50.7Not measuredOnly Claude Fable 5 measured
Design Arena: agents building web apps1261Not measuredOnly Claude Fable 5 measured
Design Arena: agents building full-stack apps1280Not measuredOnly Claude Fable 5 measured
Design Arena: agents building mobile apps1264Not measuredOnly Claude Fable 5 measured
Design Arena: agents building Android apps1283Not measuredOnly Claude Fable 5 measured
Design Arena: agents building Godot games1292Not measuredOnly Claude Fable 5 measured
Design Arena: agents building games1285Not measuredOnly Claude Fable 5 measured
Design Arena: HTML slides1277Not measuredOnly Claude Fable 5 measured
Design Arena: PowerPoint slides1295Not measuredOnly Claude Fable 5 measured
Design Arena: spreadsheetsNot measured1142Only Gemini 4 Argon measured
LiveBench research86.9%83.1%Claude Fable 5
LiveBench browser92.0%92.0%Tie
LiveBench long agentic53.2%69.9%Gemini 4 Argon
SREBench (Vals AI)Not measured44.3%Only Gemini 4 Argon measured
Finance Agent (Vals AI)56.3%65.4%Gemini 4 Argon
Tax Agent Bench (Vals AI)38.3%44.6%Gemini 4 Argon
Legal Research Bench (Vals AI)49.5%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)73.7%75.2%Gemini 4 Argon
BioMysteryBench (Vals AI)Not measured76.3%Only Gemini 4 Argon measured
Terminal-Bench-Science (Vals AI)15.7%44.3%Gemini 4 Argon
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
τ²-Bench Telecom98.5%Not measuredOnly Claude Fable 5 measured
APEX-Agents63.6%82.4%Gemini 4 Argon
Remote Labor Index16.1%Not measuredOnly Claude Fable 5 measured
PostTrainBench41.8%Not measuredOnly Claude Fable 5 measured
Vending-Bench 2$5,680$13,718Gemini 4 Argon
LMArena Search1229Not measuredOnly Claude Fable 5 measured
Neither model has a result on the other 10 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index010
Reasoning benchmarks for Claude Fable 5 and Gemini 4 Argon
BenchmarkClaude Fable 5Gemini 4 ArgonLeader
GPQA Diamond93.2%Not measuredOnly Claude Fable 5 measured
LiveBench reasoning89.7%95.1%Gemini 4 Argon
MysteryMechanism (Vals AI)Not measured45.5%Only Gemini 4 Argon measured
MMMU Pro (Vals AI)89.3%Not measuredOnly Claude Fable 5 measured
GPQA Diamond (Artificial Analysis run)92.6%Not measuredOnly Claude Fable 5 measured
Humanity's Last Exam (Artificial Analysis run)55.5%57.1%Gemini 4 Argon
GPQA Diamond (Epoch AI run)85.9%96.4%Gemini 4 Argon
ARC-AGI98.5%98.5%Tie
ARC-AGI-289.2%91.3%Gemini 4 Argon
SimpleBench81.9%Not measuredOnly Claude Fable 5 measured
Chess puzzles47.0%59.0%Gemini 4 Argon
Mystery game puzzles52.0%64.0%Gemini 4 Argon
EBR-bench39.5%64.8%Gemini 4 Argon
LMArena Text: hard prompts15071546Gemini 4 Argon
LMArena Text: expert15341550Gemini 4 Argon
LMArena Text: hard prompts in English15091548Gemini 4 Argon
LMArena Vision: diagrams1357Not measuredOnly Claude Fable 5 measured
LMArena Vision: homework1361Not measuredOnly Claude Fable 5 measured
Kagi LLM Benchmark91.4%Not measuredOnly Claude Fable 5 measured
Neither model has a result on the other 3 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index23
Math benchmarks for Claude Fable 5 and Gemini 4 Argon
BenchmarkClaude Fable 5Gemini 4 ArgonLeader
OTIS Mock AIME100.0%100.0%Tie
FrontierMath, tiers 1 to 387.0%86.0%Claude Fable 5
FrontierMath, tier 490.2%78.0%Claude Fable 5
ProofBench95.0%99.0%Gemini 4 Argon
LMArena Text: math15161536Gemini 4 Argon
LMArena Text: mathematical work15151557Gemini 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 and Gemini 4 Argon
BenchmarkClaude Fable 5Gemini 4 ArgonLeader
MMLU Pro91.5%Not measuredOnly Claude Fable 5 measured
LegalBench (Vals AI)88.6%88.3%Claude Fable 5
CorpFin (Vals AI)71.8%Not measuredOnly Claude Fable 5 measured
TaxEval (Vals AI)76.9%Not measuredOnly Claude Fable 5 measured
MortgageTax (Vals AI)68.9%Not measuredOnly Claude Fable 5 measured
MedCode (Vals AI)56.1%58.8%Gemini 4 Argon
SimpleQA Verified70.7%76.0%Gemini 4 Argon
LMArena Text: science15061548Gemini 4 Argon
LMArena Text: medicine and healthcare14801555Gemini 4 Argon
LMArena Text: legal and government14981548Gemini 4 Argon
LMArena Text: business and finance14801525Gemini 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 index16
Web design benchmarks for Claude Fable 5 and Gemini 4 Argon
BenchmarkClaude Fable 5Gemini 4 ArgonLeader
Design Arena: websites12961315Gemini 4 Argon
Design Arena: UI components13191331Gemini 4 Argon
Design Arena: game dev13351375Gemini 4 Argon
Design Arena: data viz13041336Gemini 4 Argon
Design Arena: 3D13191389Gemini 4 Argon
Design Arena: all code categories13101329Gemini 4 Argon
Design Arena: SVG1302Not measuredOnly Claude Fable 5 measured
Design Arena: ASCII art1329Not measuredOnly Claude Fable 5 measured
LiveBench design84.7%73.7%Claude Fable 5
GeneralLike-for-likePublic boards, shown as published, kept out of the index416
General benchmarks for Claude Fable 5 and Gemini 4 Argon
BenchmarkClaude Fable 5Gemini 4 ArgonLeader
Vals IndexNot measured69.2%Only Gemini 4 Argon measured
LiveBench data analysis80.5%85.2%Gemini 4 Argon
Public Benefits Bench (Vals AI)70.4%69.8%Claude Fable 5
SAGE (Vals AI)51.9%53.6%Gemini 4 Argon
MedScribe (Vals AI)88.5%87.4%Claude Fable 5
Vals Multimodal Index74.2%Not measuredOnly Claude Fable 5 measured
IFBench63.5%Not measuredOnly Claude Fable 5 measured
Long context reasoning (AA-LCR)82.3%79.7%Claude Fable 5
DTBench98.4%97.6%Claude Fable 5
LMCA61.2%63.7%Gemini 4 Argon
Surface Evolver Bench95.0%Not measuredOnly Claude Fable 5 measured
Furniture assembly35.8%72.5%Gemini 4 Argon
LMArena Text14911532Gemini 4 Argon
LMArena Text: instruction following15021534Gemini 4 Argon
LMArena Text: creative writing14941527Gemini 4 Argon
LMArena Vision1325Not measuredOnly Claude Fable 5 measured
LMArena Text: English14981538Gemini 4 Argon
LMArena Text: non-English14821522Gemini 4 Argon
LMArena Text: Chinese15431611Gemini 4 Argon
LMArena Text: German1486Not measuredOnly Claude Fable 5 measured
LMArena Text: Japanese1504Not measuredOnly Claude Fable 5 measured
LMArena Text: Korean1487Not measuredOnly Claude Fable 5 measured
LMArena Text: French1505Not measuredOnly Claude Fable 5 measured
LMArena Text: Spanish14981503Gemini 4 Argon
LMArena Text: Russian15031534Gemini 4 Argon
LMArena Text: Polish1494Not measuredOnly Claude Fable 5 measured
LMArena Text: multi-turn15041556Gemini 4 Argon
LMArena Text: longer queries15101547Gemini 4 Argon
LMArena Text: writing and language15011529Gemini 4 Argon
LMArena Text: entertainment and media14821527Gemini 4 Argon
LMArena Vision: English1323Not measuredOnly Claude Fable 5 measured
LMArena Vision: Chinese1373Not measuredOnly Claude Fable 5 measured
LMArena Vision: reading text1337Not measuredOnly Claude Fable 5 measured
LMArena Vision: humor1341Not measuredOnly Claude Fable 5 measured
LMArena Vision: creative writing1338Not measuredOnly Claude Fable 5 measured
LMArena Document1496Not measuredOnly Claude Fable 5 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 Fable 5 and Gemini 4 Argon
BenchmarkClaude Fable 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 Fable 5$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$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$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 and Gemini 4 Argon
SpecificationAnthropic Claude Fable 5Google Gemini 4 Argon
MakerAnthropicGoogle
WeightsNo public weights listedNo public weights listed
ReleasedJune 9, 2026October 13, 2026
Context window1M1.05M
Input $/Mtok$10.00$2.00
Output $/Mtok$50.00$10.00
Coding index79.381.0
Independent measurements behind it65
Cost per solved task$2.16Not computable
SourceOpenRouter listingOpenRouter listing

Questions

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

Claude Fable 5 and Gemini 4 Argon are level for coding, 79.3 against 81.0 on the Vibe Coding Index, so price and context decide. Pick Claude Fable 5 for work measured by LiveBench coding or Terminal-Bench 2.1 (Vals AI), where it leads. 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 or Gemini 4 Argon?

Claude Fable 5 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 Claude Fable 5 only.

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

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

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

78 benchmarks have a result for both models as of October 21, 2026. Claude Fable 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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