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Claude Fable 5 vs DeepSeek V4.1 Flash

Claude Fable 5 leads DeepSeek V4.1 Flash on coding, 79.3 to 62.5 on the Vibe Coding Index, and DeepSeek V4.1 Flash costs 59.5x less per output token ($0.84 vs $50.00 per million). Updated October 22, 2026; 92 benchmarks have a result for both.

Replace Claude Fable 5 Replace DeepSeek V4.1 Flash
Claude Fable 5Anthropic
Coding
79.3
Overall
79.0
Output $/M
$50.00
85
DeepSeek V4.1 FlashDeepSeek
Coding
62.5
Overall
62.4
Output $/M
$0.84
7
vs boards won of 92 shared

Claude Fable 5 or DeepSeek V4.1 Flash: which to pick

Pick Claude Fable 5 for coding: it scores 79.3 on the Vibe Coding Index against 62.5 for DeepSeek V4.1 Flash.

Pick DeepSeek V4.1 Flash for output tokens 59.5x cheaper ($0.84 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 BDeepSeek V4.1 FlashDeepSeek62.5/1005 independent benchmarksNo cost per solved task
Shared results
92
Claude Fable 5 only
35
DeepSeek V4.1 Flash only
9
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, DeepSeek V4.1 Flash 62.5 from 5 benchmarks.
Widest category
Math, 22.9 points apart on average over 6 shared benchmarks.
Widest single gap
FrontierMath, tier 4: Claude Fable 5 90.2% against DeepSeek V4.1 Flash 26.8%, 63.4 points apart on a 0 to 100 scale.
Output price
Claude Fable 5 $50.00 against DeepSeek V4.1 Flash $0.84 per million output tokens, 59.5x apart.
Context window
Claude Fable 5 takes 1M tokens, DeepSeek V4.1 Flash 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 5BarsDeepSeek V4.1 FlashTies
Coding150
Intelligence20
Agentic work90
Reasoning102
Math60
Knowledge61
Web design63
General311
All shared boards857
CodingLike-for-likeSix of these boards feed the Vibe Coding Index150
Coding benchmarks for Claude Fable 5 and DeepSeek V4.1 Flash
BenchmarkClaude Fable 5DeepSeek V4.1 FlashLeader
LiveBench coding98.3%90.2%Claude Fable 5
LMArena WebDev16241618Claude Fable 5
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%19.7%Claude Fable 5
Vibe Code Bench (Vals AI)90.3%84.7%Claude Fable 5
Code migration (Vals AI)55.1%45.6%Claude Fable 5
ProgramBench (Vals AI)2.0%0.5%Claude Fable 5
IOI (Vals AI)Not measured40.3%Only DeepSeek V4.1 Flash measured
Terminal-Bench 2.1 (Vals AI)80.5%74.5%Claude Fable 5
SWE-bench Multimodal (Vals AI)Not measured46.5%Only DeepSeek V4.1 Flash measured
Vibe Code Bench 1-100 (Vals AI)Not measured16.4%Only DeepSeek V4.1 Flash measured
SkillsBench (Vals AI)Not measured69.8%Only DeepSeek V4.1 Flash measured
CyberBench (Vals AI)Not measured73.7%Only DeepSeek V4.1 Flash measured
SciCode61.0%51.9%Claude Fable 5
Terminal-Bench Hard (Artificial Analysis run)62.9%Not measuredOnly Claude Fable 5 measured
FrontierCode53.5%43.9%Claude Fable 5
FrontierSWE47.0%Not measuredOnly Claude Fable 5 measured
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-Bench2041.31092.3Claude Fable 5
LMArena Text: coding15181502Claude Fable 5
LMArena Text: software and IT15131496Claude Fable 5
LMArena WebDev: React16311628Claude Fable 5
LMArena WebDev: HTML16511612Claude Fable 5
LMArena WebDev: from an image16231606Claude Fable 5
Neither model has a result on the other 11 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Fable 5 and DeepSeek V4.1 Flash
BenchmarkClaude Fable 5DeepSeek V4.1 FlashLeader
AA Intelligence Index49.624.7Claude Fable 5
Epoch Capabilities Index163.4155.9Claude Fable 5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index90
Agentic work benchmarks for Claude Fable 5 and DeepSeek V4.1 Flash
BenchmarkClaude Fable 5DeepSeek V4.1 FlashLeader
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 apps1284Not 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 slides1227Not measuredOnly Claude Fable 5 measured
Design Arena: PowerPoint slides1270Not measuredOnly Claude Fable 5 measured
LiveBench research86.9%86.8%Claude Fable 5
LiveBench browser92.0%84.0%Claude Fable 5
LiveBench long agentic53.2%40.1%Claude Fable 5
SREBench (Vals AI)Not measured0.8%Only DeepSeek V4.1 Flash measured
Finance Agent (Vals AI)56.3%53.5%Claude Fable 5
Tax Agent Bench (Vals AI)38.3%26.6%Claude Fable 5
Legal Research Bench (Vals AI)49.5%41.4%Claude Fable 5
Excel Modeling Benchmark (Vals AI)73.7%57.2%Claude Fable 5
BioMysteryBench (Vals AI)Not measured67.8%Only DeepSeek V4.1 Flash measured
Terminal-Bench-Science (Vals AI)15.7%0.0%Claude Fable 5
Vals Science IndexNot measured29.6%Only DeepSeek V4.1 Flash measured
τ²-Bench Telecom98.5%Not measuredOnly Claude Fable 5 measured
APEX-Agents63.6%39.5%Claude Fable 5
Remote Labor Index16.1%Not measuredOnly Claude Fable 5 measured
PostTrainBench41.8%Not measuredOnly Claude Fable 5 measured
Vending-Bench 2$5,680Not measuredOnly Claude Fable 5 measured
LMArena Search1229Not measuredOnly Claude Fable 5 measured
Neither model has a result on the other 15 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index102
Reasoning benchmarks for Claude Fable 5 and DeepSeek V4.1 Flash
BenchmarkClaude Fable 5DeepSeek V4.1 FlashLeader
GPQA Diamond93.2%Not measuredOnly Claude Fable 5 measured
LiveBench reasoning89.7%86.7%Claude Fable 5
MysteryMechanism (Vals AI)Not measured21.2%Only DeepSeek V4.1 Flash 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%39.2%Claude Fable 5
GPQA Diamond (Epoch AI run)85.9%89.8%DeepSeek V4.1 Flash
ARC-AGI98.5%94.5%Claude Fable 5
ARC-AGI-289.2%72.9%Claude Fable 5
SimpleBench81.9%Not measuredOnly Claude Fable 5 measured
Chess puzzles47.0%48.0%DeepSeek V4.1 Flash
Mystery game puzzles52.0%43.0%Claude Fable 5
EBR-bench39.5%Not measuredOnly Claude Fable 5 measured
LMArena Text: hard prompts15071483Claude Fable 5
LMArena Text: expert15341501Claude Fable 5
LMArena Text: hard prompts in English15091488Claude Fable 5
LMArena Vision: diagrams13571297Claude Fable 5
LMArena Vision: homework13611307Claude 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 index60
Math benchmarks for Claude Fable 5 and DeepSeek V4.1 Flash
BenchmarkClaude Fable 5DeepSeek V4.1 FlashLeader
OTIS Mock AIME100.0%98.3%Claude Fable 5
FrontierMath, tiers 1 to 387.0%67.4%Claude Fable 5
FrontierMath, tier 490.2%26.8%Claude Fable 5
ProofBench95.0%54.0%Claude Fable 5
LMArena Text: math15161478Claude Fable 5
LMArena Text: mathematical work15151485Claude Fable 5
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index61
Knowledge benchmarks for Claude Fable 5 and DeepSeek V4.1 Flash
BenchmarkClaude Fable 5DeepSeek V4.1 FlashLeader
MMLU Pro91.5%Not measuredOnly Claude Fable 5 measured
LegalBench (Vals AI)88.6%83.3%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%41.2%Claude Fable 5
SimpleQA Verified70.7%42.9%Claude Fable 5
LMArena Text: science15061469Claude Fable 5
LMArena Text: medicine and healthcare14801484DeepSeek V4.1 Flash
LMArena Text: legal and government14981443Claude Fable 5
LMArena Text: business and finance14801461Claude Fable 5
Neither model has a result on the other 7 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index63
Web design benchmarks for Claude Fable 5 and DeepSeek V4.1 Flash
BenchmarkClaude Fable 5DeepSeek V4.1 FlashLeader
Design Arena: websites12951308DeepSeek V4.1 Flash
Design Arena: UI components13161312Claude Fable 5
Design Arena: game dev13351330Claude Fable 5
Design Arena: data viz13041291Claude Fable 5
Design Arena: 3D13181355DeepSeek V4.1 Flash
Design Arena: all code categories13101320DeepSeek V4.1 Flash
Design Arena: SVG13021245Claude Fable 5
Design Arena: ASCII art13291265Claude Fable 5
LiveBench design84.7%79.2%Claude Fable 5
GeneralLike-for-likePublic boards, shown as published, kept out of the index311
General benchmarks for Claude Fable 5 and DeepSeek V4.1 Flash
BenchmarkClaude Fable 5DeepSeek V4.1 FlashLeader
LiveBench data analysis80.5%79.3%Claude Fable 5
Public Benefits Bench (Vals AI)70.4%64.3%Claude Fable 5
SAGE (Vals AI)51.9%47.9%Claude Fable 5
MedScribe (Vals AI)88.5%85.5%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%84.0%DeepSeek V4.1 Flash
DTBench98.4%89.9%Claude Fable 5
LMCA61.2%47.0%Claude Fable 5
Surface Evolver Bench95.0%46.3%Claude Fable 5
Furniture assembly35.8%34.2%Claude Fable 5
LMArena Text14911464Claude Fable 5
LMArena Text: instruction following15021473Claude Fable 5
LMArena Text: creative writing14941437Claude Fable 5
LMArena Vision13251278Claude Fable 5
LMArena Text: English14981473Claude Fable 5
LMArena Text: non-English14821449Claude Fable 5
LMArena Text: Chinese15431501Claude Fable 5
LMArena Text: German14861470Claude Fable 5
LMArena Text: Japanese15041432Claude Fable 5
LMArena Text: Korean14871436Claude Fable 5
LMArena Text: French15051465Claude Fable 5
LMArena Text: Spanish14981459Claude Fable 5
LMArena Text: Russian15031467Claude Fable 5
LMArena Text: Polish14941457Claude Fable 5
LMArena Text: multi-turn15041461Claude Fable 5
LMArena Text: longer queries15101473Claude Fable 5
LMArena Text: writing and language15011450Claude Fable 5
LMArena Text: entertainment and media14821445Claude Fable 5
LMArena Vision: English13231288Claude Fable 5
LMArena Vision: Chinese13731327Claude Fable 5
LMArena Vision: reading text13371282Claude Fable 5
LMArena Vision: humor13411260Claude Fable 5
LMArena Vision: creative writing13381275Claude Fable 5
LMArena Document1496Not measuredOnly Claude Fable 5 measured
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 DeepSeek V4.1 Flash
BenchmarkClaude Fable 5DeepSeek V4.1 FlashLeader
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
DeepSeek V4.1 Flash$0.0006Fits in one request

DeepSeek V4.1 Flash costs less

Repository review

50K input + 3K output tokens

Claude Fable 5$0.650Fits in one request
DeepSeek V4.1 Flash$0.014Fits in one request

DeepSeek V4.1 Flash costs less

Agent loop

200K input + 10K output tokens

Claude Fable 5$2.50Fits in one request
DeepSeek V4.1 Flash$0.053Fits in one request

DeepSeek V4.1 Flash 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 DeepSeek V4.1 Flash
SpecificationAnthropic Claude Fable 5DeepSeek V4.1 Flash
MakerAnthropicDeepSeek
WeightsNo public weights listedOpen weights
ReleasedJune 9, 2026September 10, 2026
Context window1M1.05M
Input $/Mtok$10.00$0.2225
Output $/Mtok$50.00$0.84
Coding index79.362.5
Independent measurements behind it65
Cost per solved task$2.16Not computable
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Fable 5 better than DeepSeek V4.1 Flash for coding?

Pick Claude Fable 5 for coding: it scores 79.3 on the Vibe Coding Index against 62.5 for DeepSeek V4.1 Flash. Pick DeepSeek V4.1 Flash for output tokens 59.5x cheaper ($0.84 vs $50.00 per million) and a larger context window (1.05M against 1M tokens).

Which is cheaper, Claude Fable 5 or DeepSeek V4.1 Flash?

Claude Fable 5 costs $10.00 per million input tokens and $50.00 per million output tokens; DeepSeek V4.1 Flash costs $0.2225 and $0.84. Cost per solved task is known for Claude Fable 5 only.

Which has the bigger context window, Claude Fable 5 or DeepSeek V4.1 Flash?

DeepSeek V4.1 Flash, with 1.05M tokens against 1M.

How many benchmarks is the Claude Fable 5 vs DeepSeek V4.1 Flash comparison based on?

92 benchmarks have a result for both models as of October 22, 2026. Claude Fable 5's coding index rests on 6 independent benchmarks and DeepSeek V4.1 Flash's on 5. 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-deepseek-v4-1-flash">LLMBenchmark.ai, Claude Fable 5 vs DeepSeek V4.1 Flash</a></p>