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Claude Fable 5 vs Claude Opus 5

Claude Opus 5 leads Claude Fable 5 on coding, 83.0 to 79.3 on the Vibe Coding Index, and Claude Opus 5 costs 2.0x less per output token ($25.00 vs $50.00 per million). Updated October 21, 2026; 118 benchmarks have a result for both.

Replace Claude Fable 5 Replace Claude Opus 5
Claude Fable 5Anthropic
Coding
79.3
Overall
79.0
Output $/M
$50.00
40
Claude Opus 5Anthropic
Coding
83.0
Overall
81.6
Output $/M
$25.00
78
vs boards won of 118 shared

Claude Fable 5 or Claude Opus 5: which to pick

Pick Claude Opus 5 for coding: it scores 83.0 on the Vibe Coding Index against 79.3 for Claude Fable 5.

Pick Claude Fable 5 for work measured by LiveBench coding or LiveCodeBench (Vals AI), where it leads.

Model AClaude Fable 5Anthropic79.3/1006 independent benchmarks$2.16 per solved taskModel BClaude Opus 5Anthropic83.0/1006 independent benchmarks$1.33 per solved task
Shared results
118
Claude Fable 5 only
9
Claude Opus 5 only
13
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, Claude Opus 5 83.0 from 6 benchmarks.
Widest category
Agentic work, 6.2 points apart on average over 20 shared benchmarks.
Widest single gap
Vending-Bench 2: Claude Fable 5 $5,680 against Claude Opus 5 $11,182, 34.4 points apart on a 0 to 100 scale.
Output price
Claude Fable 5 $50.00 against Claude Opus 5 $25.00 per million output tokens, 2.0x apart.
Context window
Both take 1M tokens.

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 5BarsClaude Opus 5Ties
Coding614
Intelligence02
Agentic work713
Reasoning611
Math33
Knowledge38
Web design18
General1419
All shared boards4078
CodingLike-for-likeSix of these boards feed the Vibe Coding Index614
Coding benchmarks for Claude Fable 5 and Claude Opus 5
BenchmarkClaude Fable 5Claude Opus 5Leader
LiveBench coding98.3%90.8%Claude Fable 5
LMArena WebDev16241689Claude Opus 5
AA Coding Index76.578.0Claude Opus 5
LiveCodeBench (Vals AI)89.8%89.0%Claude Fable 5
SWE-bench Verified (Vals AI)95.0%97.0%Claude Opus 5
Terminal-Bench 4 (Vals AI)41.4%53.5%Claude Opus 5
Vibe Code Bench (Vals AI)90.3%88.4%Claude Fable 5
Code migration (Vals AI)55.1%57.5%Claude Opus 5
ProgramBench (Vals AI)2.0%3.0%Claude Opus 5
IOI (Vals AI)Not measured84.3%Only Claude Opus 5 measured
Terminal-Bench 2.1 (Vals AI)80.5%84.6%Claude Opus 5
Vibe Code Bench 1-100 (Vals AI)Not measured28.5%Only Claude Opus 5 measured
SkillsBench (Vals AI)Not measured60.4%Only Claude Opus 5 measured
CyberBench (Vals AI)Not measured65.4%Only Claude Opus 5 measured
SciCode61.0%56.4%Claude Fable 5
Terminal-Bench Hard (Artificial Analysis run)62.9%Not measuredOnly Claude Fable 5 measured
FrontierCode53.5%53.4%Claude Fable 5
FrontierSWE47.0%52.0%Claude Opus 5
GSO-Bench78.4%Not measuredOnly Claude Fable 5 measured
WeirdML91.9%91.8%Claude Fable 5
MirrorCode63.9%Not measuredOnly Claude Fable 5 measured
ALE-Bench2041.32164.6Claude Opus 5
LMArena Text: coding15181533Claude Opus 5
LMArena Text: software and IT15131527Claude Opus 5
LMArena WebDev: React16311711Claude Opus 5
LMArena WebDev: HTML16511680Claude Opus 5
LMArena WebDev: from an image16231662Claude Opus 5
SciCodeNot measured13.8%Only Claude Opus 5 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 Claude Opus 5
BenchmarkClaude Fable 5Claude Opus 5Leader
AA Intelligence Index49.650.8Claude Opus 5
Epoch Capabilities Index163.4163.9Claude Opus 5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index713
Agentic work benchmarks for Claude Fable 5 and Claude Opus 5
BenchmarkClaude Fable 5Claude Opus 5Leader
AA Agentic Index50.756.5Claude Opus 5
Design Arena: agents building web apps12611266Claude Opus 5
Design Arena: agents building full-stack apps12801306Claude Opus 5
Design Arena: agents building mobile apps12641348Claude Opus 5
Design Arena: agents building Android apps12831254Claude Fable 5
Design Arena: agents building Godot games12921279Claude Fable 5
Design Arena: agents building games12851261Claude Fable 5
Design Arena: HTML slides1277Not measuredOnly Claude Fable 5 measured
Design Arena: PowerPoint slides12951265Claude Fable 5
LiveBench research86.9%88.9%Claude Opus 5
LiveBench browser92.0%84.0%Claude Fable 5
LiveBench long agentic53.2%62.1%Claude Opus 5
SREBench (Vals AI)Not measured12.2%Only Claude Opus 5 measured
Finance Agent (Vals AI)56.3%58.6%Claude Opus 5
Tax Agent Bench (Vals AI)38.3%45.5%Claude Opus 5
Legal Research Bench (Vals AI)49.5%55.3%Claude Opus 5
Excel Modeling Benchmark (Vals AI)73.7%73.6%Claude Fable 5
BioMysteryBench (Vals AI)Not measured79.3%Only Claude Opus 5 measured
Terminal-Bench-Science (Vals AI)15.7%27.1%Claude Opus 5
Vals Science IndexNot measured47.9%Only Claude Opus 5 measured
Time Horizon Index (Vals AI)Not measured18.8%Only Claude Opus 5 measured
CUA-bench (Vals AI)Not measured9.0%Only Claude Opus 5 measured
τ²-Bench Telecom98.5%Not measuredOnly Claude Fable 5 measured
APEX-Agents63.6%65.8%Claude Opus 5
Remote Labor Index16.1%Not measuredOnly Claude Fable 5 measured
OSWorld 2.0Not measured31.4%Only Claude Opus 5 measured
BALROGNot measured63.4%Only Claude Opus 5 measured
PostTrainBench41.8%35.0%Claude Fable 5
Vending-Bench 2$5,680$11,182Claude Opus 5
LMArena Search12291242Claude Opus 5
Neither model has a result on the other 11 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index611
Reasoning benchmarks for Claude Fable 5 and Claude Opus 5
BenchmarkClaude Fable 5Claude Opus 5Leader
GPQA Diamond93.2%93.4%Claude Opus 5
LiveBench reasoning89.7%91.2%Claude Opus 5
MysteryMechanism (Vals AI)Not measured37.4%Only Claude Opus 5 measured
MMMU Pro (Vals AI)89.3%89.9%Claude Opus 5
GPQA Diamond (Artificial Analysis run)92.6%93.7%Claude Opus 5
Humanity's Last Exam (Artificial Analysis run)55.5%54.9%Claude Fable 5
GPQA Diamond (Epoch AI run)85.9%93.9%Claude Opus 5
ARC-AGI98.5%97.5%Claude Fable 5
ARC-AGI-289.2%90.4%Claude Opus 5
SimpleBench81.9%80.6%Claude Fable 5
Chess puzzles47.0%43.0%Claude Fable 5
Mystery game puzzles52.0%59.0%Claude Opus 5
EBR-bench39.5%45.7%Claude Opus 5
LMArena Text: hard prompts15071527Claude Opus 5
LMArena Text: expert15341554Claude Opus 5
LMArena Text: hard prompts in English15091523Claude Opus 5
LMArena Vision: diagrams13571348Claude Fable 5
LMArena Vision: homework13611338Claude Fable 5
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 index33
Math benchmarks for Claude Fable 5 and Claude Opus 5
BenchmarkClaude Fable 5Claude Opus 5Leader
OTIS Mock AIME100.0%98.9%Claude Fable 5
FrontierMath, tiers 1 to 387.0%85.6%Claude Fable 5
FrontierMath, tier 490.2%73.2%Claude Fable 5
ProofBench95.0%99.0%Claude Opus 5
LMArena Text: math15161533Claude Opus 5
LMArena Text: mathematical work15151544Claude Opus 5
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index38
Knowledge benchmarks for Claude Fable 5 and Claude Opus 5
BenchmarkClaude Fable 5Claude Opus 5Leader
MMLU Pro91.5%91.6%Claude Opus 5
LegalBench (Vals AI)88.6%87.0%Claude Fable 5
CorpFin (Vals AI)71.8%73.2%Claude Opus 5
TaxEval (Vals AI)76.9%75.1%Claude Fable 5
MortgageTax (Vals AI)68.9%72.1%Claude Opus 5
MedCode (Vals AI)56.1%63.6%Claude Opus 5
SimpleQA Verified70.7%59.9%Claude Fable 5
LMArena Text: science15061531Claude Opus 5
LMArena Text: medicine and healthcare14801525Claude Opus 5
LMArena Text: legal and government14981530Claude Opus 5
LMArena Text: business and finance14801501Claude Opus 5
Neither model has a result on the other 7 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index18
Web design benchmarks for Claude Fable 5 and Claude Opus 5
BenchmarkClaude Fable 5Claude Opus 5Leader
Design Arena: websites12961309Claude Opus 5
Design Arena: UI components13191349Claude Opus 5
Design Arena: game dev13351338Claude Opus 5
Design Arena: data viz13041329Claude Opus 5
Design Arena: 3D13191335Claude Opus 5
Design Arena: all code categories13101324Claude Opus 5
Design Arena: SVG13021311Claude Opus 5
Design Arena: ASCII art13291352Claude Opus 5
LiveBench design84.7%83.0%Claude Fable 5
GeneralLike-for-likePublic boards, shown as published, kept out of the index1419
General benchmarks for Claude Fable 5 and Claude Opus 5
BenchmarkClaude Fable 5Claude Opus 5Leader
LiveBench data analysis80.5%74.6%Claude Fable 5
Public Benefits Bench (Vals AI)70.4%76.9%Claude Opus 5
SAGE (Vals AI)51.9%49.4%Claude Fable 5
MedScribe (Vals AI)88.5%91.0%Claude Opus 5
Vals Multimodal Index74.2%73.9%Claude Fable 5
IFBench63.5%Not measuredOnly Claude Fable 5 measured
Long context reasoning (AA-LCR)82.3%82.0%Claude Fable 5
DTBench98.4%97.9%Claude Fable 5
LMCA61.2%64.5%Claude Opus 5
Surface Evolver Bench95.0%Not measuredOnly Claude Fable 5 measured
Furniture assembly35.8%60.8%Claude Opus 5
LMArena Text14911509Claude Opus 5
LMArena Text: instruction following15021518Claude Opus 5
LMArena Text: creative writing14941493Claude Fable 5
LMArena Vision13251320Claude Fable 5
LMArena Text: English14981508Claude Opus 5
LMArena Text: non-English14821502Claude Opus 5
LMArena Text: Chinese15431573Claude Opus 5
LMArena Text: German14861527Claude Opus 5
LMArena Text: Japanese15041520Claude Opus 5
LMArena Text: Korean14871517Claude Opus 5
LMArena Text: French15051519Claude Opus 5
LMArena Text: Spanish14981523Claude Opus 5
LMArena Text: Russian15031507Claude Opus 5
LMArena Text: Polish14941522Claude Opus 5
LMArena Text: multi-turn15041500Claude Fable 5
LMArena Text: longer queries15101517Claude Opus 5
LMArena Text: writing and language15011499Claude Fable 5
LMArena Text: entertainment and media14821481Claude Fable 5
LMArena Vision: English13231315Claude Fable 5
LMArena Vision: Chinese13731400Claude Opus 5
LMArena Vision: reading text13371329Claude Fable 5
LMArena Vision: humor13411293Claude Fable 5
LMArena Vision: creative writing13381313Claude Fable 5
LMArena Document14961516Claude Opus 5
Neither model has a result on the other 11 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 Claude Opus 5
BenchmarkClaude Fable 5Claude Opus 5Leader
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
Claude Opus 5$0.018Fits in one request

Claude Opus 5 costs less

Repository review

50K input + 3K output tokens

Claude Fable 5$0.650Fits in one request
Claude Opus 5$0.325Fits in one request

Claude Opus 5 costs less

Agent loop

200K input + 10K output tokens

Claude Fable 5$2.50Fits in one request
Claude Opus 5$1.25Fits in one request

Claude Opus 5 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 Claude Opus 5
SpecificationAnthropic Claude Fable 5Anthropic Claude Opus 5
MakerAnthropicAnthropic
WeightsNo public weights listedNo public weights listed
ReleasedJune 9, 2026July 24, 2026
Context window1M1M
Input $/Mtok$10.00$5.00
Output $/Mtok$50.00$25.00
Coding index79.383.0
Independent measurements behind it66
Cost per solved task$2.16$1.33
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Fable 5 better than Claude Opus 5 for coding?

Pick Claude Opus 5 for coding: it scores 83.0 on the Vibe Coding Index against 79.3 for Claude Fable 5. Pick Claude Fable 5 for work measured by LiveBench coding or LiveCodeBench (Vals AI), where it leads.

Which is cheaper, Claude Fable 5 or Claude Opus 5?

Claude Fable 5 costs $10.00 per million input tokens and $50.00 per million output tokens; Claude Opus 5 costs $5.00 and $25.00. Per solved SWE-bench Verified task, Claude Fable 5 costs $2.16 and Claude Opus 5 $1.33.

Which has the bigger context window, Claude Fable 5 or Claude Opus 5?

Neither: both take 1M tokens.

How many benchmarks is the Claude Fable 5 vs Claude Opus 5 comparison based on?

118 benchmarks have a result for both models as of October 21, 2026. Claude Fable 5's coding index rests on 6 independent benchmarks and Claude Opus 5's on 6. 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-fable-5-vs-claude-opus-5">LLMBenchmark.ai, Claude Fable 5 vs Claude Opus 5</a></p>