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Claude Fable 5 vs Claude Opus 4.5

Claude Fable 5 leads Claude Opus 4.5 on coding, 79.3 to 44.0 on the Vibe Coding Index, and Claude Opus 4.5 costs 2.0x less per output token ($25.00 vs $50.00 per million). Updated October 22, 2026; 85 benchmarks have a result for both.

Replace Claude Fable 5 Replace Claude Opus 4.5
Claude Fable 5Anthropic
Coding
79.3
Overall
79.0
Output $/M
$50.00
83
Claude Opus 4.5Anthropic
Coding
44.0
Overall
55.7
Output $/M
$25.00
2
vs boards won of 85 shared

Claude Fable 5 or Claude Opus 4.5: which to pick

Pick Claude Fable 5 for coding: it scores 79.3 on the Vibe Coding Index against 44.0 for Claude Opus 4.5.

Pick Claude Opus 4.5 for output tokens 2.0x cheaper ($25.00 vs $50.00 per million) and a lower cost per solved task ($1.37 against $2.16).

Model AClaude Fable 5Anthropic79.3/1006 independent benchmarks$2.16 per solved taskModel BClaude Opus 4.5Anthropic44.0/1003 independent benchmarks$1.37 per solved task
Shared results
85
Claude Fable 5 only
42
Claude Opus 4.5 only
23
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 4.5 44.0 from 3 benchmarks.
Widest category
Math, 37.9 points apart on average over 6 shared benchmarks.
Widest single gap
FrontierMath, tier 4: Claude Fable 5 90.2% against Claude Opus 4.5 4.9%, 85.3 points apart on a 0 to 100 scale.
Output price
Claude Fable 5 $50.00 against Claude Opus 4.5 $25.00 per million output tokens, 2.0x apart.
Context window
Claude Fable 5 takes 1M tokens, Claude Opus 4.5 200K.

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 4.5Ties
Coding110
Intelligence20
Agentic work70
Reasoning141
Math60
Knowledge110
Web design80
General241
All shared boards832
CodingLike-for-likeSix of these boards feed the Vibe Coding Index110
Coding benchmarks for Claude Fable 5 and Claude Opus 4.5
BenchmarkClaude Fable 5Claude Opus 4.5Leader
SWE-bench VerifiedNot measured79.2%Only Claude Opus 4.5 measured
SWE-bench (full test set)Not measured52.6%Only Claude Opus 4.5 measured
SWE-bench MultilingualNot measured70.7%Only Claude Opus 4.5 measured
LiveBench coding98.3%Not measuredOnly Claude Fable 5 measured
LMArena WebDev16241494Claude Fable 5
AA Coding Index76.5Not measuredOnly Claude Fable 5 measured
LiveCodeBench (Vals AI)89.8%83.7%Claude Fable 5
SWE-bench Verified (Vals AI)95.0%76.4%Claude Fable 5
Terminal-Bench 4 (Vals AI)41.4%Not measuredOnly Claude Fable 5 measured
Vibe Code Bench (Vals AI)90.3%20.6%Claude Fable 5
Code migration (Vals AI)55.1%Not measuredOnly Claude Fable 5 measured
ProgramBench (Vals AI)2.0%Not measuredOnly Claude Fable 5 measured
Terminal-Bench 2.1 (Vals AI)80.5%Not measuredOnly Claude Fable 5 measured
LiveCodeBench (Artificial Analysis run)Not measured87.1%Only Claude Opus 4.5 measured
SciCode61.0%Not measuredOnly Claude Fable 5 measured
Terminal-Bench Hard (Artificial Analysis run)62.9%47.0%Claude Fable 5
Terminal-BenchNot measured63.1%Only Claude Opus 4.5 measured
FrontierCode53.5%Not measuredOnly Claude Fable 5 measured
FrontierSWE47.0%Not measuredOnly Claude Fable 5 measured
GSO-Bench78.4%26.5%Claude Fable 5
WeirdML91.9%63.7%Claude Fable 5
MirrorCode63.9%Not measuredOnly Claude Fable 5 measured
CybenchNot measured82.0%Only Claude Opus 4.5 measured
ALE-Bench2041.3Not measuredOnly Claude Fable 5 measured
LMArena Text: coding15181503Claude Fable 5
LMArena Text: software and IT15131483Claude Fable 5
LMArena WebDev: React16311478Claude Fable 5
LMArena WebDev: HTML16511510Claude Fable 5
LMArena WebDev: from an image1623Not measuredOnly Claude Fable 5 measured
Neither model has a result on the other 10 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Fable 5 and Claude Opus 4.5
BenchmarkClaude Fable 5Claude Opus 4.5Leader
AA Intelligence Index49.629.1Claude Fable 5
Epoch Capabilities Index163.4150.1Claude Fable 5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index70
Agentic work benchmarks for Claude Fable 5 and Claude Opus 4.5
BenchmarkClaude Fable 5Claude Opus 4.5Leader
AA Agentic Index50.7Not measuredOnly Claude Fable 5 measured
Design Arena: agents building web apps12611159Claude Fable 5
Design Arena: agents building full-stack apps12801156Claude Fable 5
Design Arena: agents building mobile apps12641189Claude Fable 5
Design Arena: agents building Android apps12841176Claude Fable 5
Design Arena: agents building Godot games1292Not measuredOnly Claude Fable 5 measured
Design Arena: agents building games1285Not measuredOnly Claude Fable 5 measured
Design Arena: HTML slides1227Not measuredOnly Claude Fable 5 measured
Design Arena: PowerPoint slides1270Not measuredOnly Claude Fable 5 measured
LiveBench research86.9%Not measuredOnly Claude Fable 5 measured
LiveBench browser92.0%Not measuredOnly Claude Fable 5 measured
LiveBench long agentic53.2%Not measuredOnly Claude Fable 5 measured
Finance Agent (Vals AI)56.3%Not measuredOnly Claude Fable 5 measured
Tax Agent Bench (Vals AI)38.3%Not measuredOnly Claude Fable 5 measured
Legal Research Bench (Vals AI)49.5%Not measuredOnly Claude Fable 5 measured
Excel Modeling Benchmark (Vals AI)73.7%Not measuredOnly Claude Fable 5 measured
Terminal-Bench-Science (Vals AI)15.7%Not measuredOnly Claude Fable 5 measured
τ²-Bench Telecom98.5%89.5%Claude Fable 5
APEX-Agents63.6%Not measuredOnly Claude Fable 5 measured
METR time horizonsNot measured75.0%Only Claude Opus 4.5 measured
Remote Labor Index16.1%3.8%Claude Fable 5
GDPvalNot measured45.5%Only Claude Opus 4.5 measured
BALROGNot measured43.5%Only Claude Opus 4.5 measured
DeepResearch BenchNot measured54.8%Only Claude Opus 4.5 measured
PostTrainBench41.8%Not measuredOnly Claude Fable 5 measured
OSWorldNot measured66.3%Only Claude Opus 4.5 measured
Vending-Bench 2$5,680$4,967Claude Fable 5
LMArena Search1229Not measuredOnly Claude Fable 5 measured
Berkeley Function Calling Leaderboard (BFCL)Not measured77.5%Only Claude Opus 4.5 measured
Neither model has a result on the other 12 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index141
Reasoning benchmarks for Claude Fable 5 and Claude Opus 4.5
BenchmarkClaude Fable 5Claude Opus 4.5Leader
GPQA Diamond93.2%85.9%Claude Fable 5
LiveBench reasoning89.7%Not measuredOnly Claude Fable 5 measured
MMMU Pro (Vals AI)89.3%83.0%Claude Fable 5
GPQA Diamond (Artificial Analysis run)92.6%86.6%Claude Fable 5
Humanity's Last Exam (Artificial Analysis run)55.5%30.1%Claude Fable 5
GPQA Diamond (Epoch AI run)85.9%86.0%Claude Opus 4.5
ARC-AGI98.5%80.0%Claude Fable 5
ARC-AGI-289.2%37.6%Claude Fable 5
SimpleBench81.9%62.0%Claude Fable 5
Chess puzzles47.0%14.0%Claude Fable 5
Mystery game puzzles52.0%22.0%Claude Fable 5
EBR-bench39.5%14.3%Claude Fable 5
VPCTNot measured40.0%Only Claude Opus 4.5 measured
LMArena Text: hard prompts15071476Claude Fable 5
LMArena Text: expert15341487Claude Fable 5
LMArena Text: hard prompts in English15091482Claude Fable 5
LMArena Vision: diagrams1357Not measuredOnly Claude Fable 5 measured
LMArena Vision: homework1361Not measuredOnly Claude Fable 5 measured
Kagi LLM Benchmark91.4%80.2%Claude Fable 5
Neither model has a result on the other 3 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index60
Math benchmarks for Claude Fable 5 and Claude Opus 4.5
BenchmarkClaude Fable 5Claude Opus 4.5Leader
AIMENot measured95.4%Only Claude Opus 4.5 measured
MGSM (Vals AI)Not measured95.2%Only Claude Opus 4.5 measured
AA Math IndexNot measured91.3Only Claude Opus 4.5 measured
AIME 2025 (Artificial Analysis run)Not measured91.3%Only Claude Opus 4.5 measured
OTIS Mock AIME100.0%86.1%Claude Fable 5
FrontierMath, tiers 1 to 387.0%34.4%Claude Fable 5
FrontierMath, tier 490.2%4.9%Claude Fable 5
ProofBench95.0%36.0%Claude Fable 5
LMArena Text: math15161463Claude Fable 5
LMArena Text: mathematical work15151468Claude Fable 5
Neither model has a result on the other 3 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index110
Knowledge benchmarks for Claude Fable 5 and Claude Opus 4.5
BenchmarkClaude Fable 5Claude Opus 4.5Leader
MMLU Pro91.5%87.3%Claude Fable 5
LegalBench (Vals AI)88.6%84.6%Claude Fable 5
CaseLaw (Vals AI)Not measured62.6%Only Claude Opus 4.5 measured
CorpFin (Vals AI)71.8%65.1%Claude Fable 5
TaxEval (Vals AI)76.9%74.9%Claude Fable 5
MortgageTax (Vals AI)68.9%68.7%Claude Fable 5
MedQA (Vals AI)Not measured95.9%Only Claude Opus 4.5 measured
MedCode (Vals AI)56.1%49.2%Claude Fable 5
MMLU Pro (Artificial Analysis run)Not measured89.5%Only Claude Opus 4.5 measured
SimpleQA Verified70.7%45.7%Claude Fable 5
GeoBenchNot measured75.0%Only Claude Opus 4.5 measured
LMArena Text: science15061454Claude Fable 5
LMArena Text: medicine and healthcare14801444Claude Fable 5
LMArena Text: legal and government14981459Claude Fable 5
LMArena Text: business and finance14801448Claude Fable 5
FACTS Benchmark SuiteNot measured43.9%Only Claude Opus 4.5 measured
Neither model has a result on the other 2 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index80
Web design benchmarks for Claude Fable 5 and Claude Opus 4.5
BenchmarkClaude Fable 5Claude Opus 4.5Leader
Design Arena: websites12951247Claude Fable 5
Design Arena: UI components13161235Claude Fable 5
Design Arena: game dev13351228Claude Fable 5
Design Arena: data viz13041243Claude Fable 5
Design Arena: 3D13181213Claude Fable 5
Design Arena: all code categories13101242Claude Fable 5
Design Arena: SVG13021180Claude Fable 5
Design Arena: ASCII art13291190Claude Fable 5
LiveBench design84.7%Not measuredOnly Claude Fable 5 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index241
General benchmarks for Claude Fable 5 and Claude Opus 4.5
BenchmarkClaude Fable 5Claude Opus 4.5Leader
LiveBench data analysis80.5%Not measuredOnly Claude Fable 5 measured
Public Benefits Bench (Vals AI)70.4%Not measuredOnly Claude Fable 5 measured
SAGE (Vals AI)51.9%52.1%Claude Opus 4.5
MedScribe (Vals AI)88.5%85.3%Claude Fable 5
Vals Multimodal Index74.2%Not measuredOnly Claude Fable 5 measured
IFBench63.5%58.0%Claude Fable 5
Long context reasoning (AA-LCR)82.3%77.3%Claude Fable 5
DTBench98.4%89.9%Claude Fable 5
LMCA61.2%44.5%Claude Fable 5
CL-benchNot measured21.1%Only Claude Opus 4.5 measured
Surface Evolver Bench95.0%Not measuredOnly Claude Fable 5 measured
Furniture assembly35.8%28.3%Claude Fable 5
LMArena Text14911451Claude Fable 5
LMArena Text: instruction following15021478Claude Fable 5
LMArena Text: creative writing14941445Claude Fable 5
LMArena Vision1325Not measuredOnly Claude Fable 5 measured
LMArena Text: English14981461Claude Fable 5
LMArena Text: non-English14821438Claude Fable 5
LMArena Text: Chinese15431470Claude Fable 5
LMArena Text: German14861449Claude Fable 5
LMArena Text: Japanese15041417Claude Fable 5
LMArena Text: Korean14871424Claude Fable 5
LMArena Text: French15051471Claude Fable 5
LMArena Text: Spanish14981457Claude Fable 5
LMArena Text: Russian15031447Claude Fable 5
LMArena Text: Polish14941439Claude Fable 5
LMArena Text: multi-turn15041466Claude Fable 5
LMArena Text: longer queries15101479Claude Fable 5
LMArena Text: writing and language15011452Claude Fable 5
LMArena Text: entertainment and media14821434Claude Fable 5
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 Document14961462Claude Fable 5
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 Claude Opus 4.5
BenchmarkClaude Fable 5Claude Opus 4.5Leader
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 4.5$0.018Fits in one request

Claude Opus 4.5 costs less

Repository review

50K input + 3K output tokens

Claude Fable 5$0.650Fits in one request
Claude Opus 4.5$0.325Fits in one request

Claude Opus 4.5 costs less

Agent loop

200K input + 10K output tokens

Claude Fable 5$2.50Fits in one request
Claude Opus 4.5$1.25Exceeds the context window

Claude Opus 4.5 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 4.5
SpecificationAnthropic Claude Fable 5Anthropic Claude Opus 4.5
MakerAnthropicAnthropic
WeightsNo public weights listedNo public weights listed
ReleasedJune 9, 2026November 24, 2025
Context window1M200K
Input $/Mtok$10.00$5.00
Output $/Mtok$50.00$25.00
Coding index79.344.0
Independent measurements behind it63
Cost per solved task$2.16$1.37
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Fable 5 better than Claude Opus 4.5 for coding?

Pick Claude Fable 5 for coding: it scores 79.3 on the Vibe Coding Index against 44.0 for Claude Opus 4.5. Pick Claude Opus 4.5 for output tokens 2.0x cheaper ($25.00 vs $50.00 per million) and a lower cost per solved task ($1.37 against $2.16).

Which is cheaper, Claude Fable 5 or Claude Opus 4.5?

Claude Fable 5 costs $10.00 per million input tokens and $50.00 per million output tokens; Claude Opus 4.5 costs $5.00 and $25.00. Per solved SWE-bench Verified task, Claude Fable 5 costs $2.16 and Claude Opus 4.5 $1.37.

Which has the bigger context window, Claude Fable 5 or Claude Opus 4.5?

Claude Fable 5, with 1M tokens against 200K.

How many benchmarks is the Claude Fable 5 vs Claude Opus 4.5 comparison based on?

85 benchmarks have a result for both models as of October 22, 2026. Claude Fable 5's coding index rests on 6 independent benchmarks and Claude Opus 4.5's on 3. Where only one model has a result, the page says so instead of naming a winner.

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