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Claude Fable 5.1 vs Qwen3.8 Max (0902)

Claude Fable 5.1 leads Qwen3.8 Max (0902) on coding, 84.2 to 62.4 on the Vibe Coding Index, and Qwen3.8 Max (0902) costs 8.3x less per output token ($6.00 vs $50.00 per million). Updated October 22, 2026; 109 benchmarks have a result for both.

Replace Claude Fable 5.1 Replace Qwen3.8 Max (0902)
Claude Fable 5.1Anthropic
Coding
84.2
Overall
84.7
Output $/M
$50.00
104
Qwen3.8 Max (0902)Qwen
Coding
62.4
Overall
68.9
Output $/M
$6.00
3
vs boards won of 109 shared, 2 tied

Claude Fable 5.1 or Qwen3.8 Max (0902): which to pick

Pick Claude Fable 5.1 for coding: it scores 84.2 on the Vibe Coding Index against 62.4 for Qwen3.8 Max (0902).

Pick Qwen3.8 Max (0902) for output tokens 8.3x cheaper ($6.00 vs $50.00 per million) and work measured by LMArena Search or GPQA Diamond, where it leads.

Model AClaude Fable 5.1Anthropic84.2/1005 independent benchmarksNo cost per solved taskModel BQwen3.8 Max (0902)Qwen62.4/1005 independent benchmarks$1.32 per solved task
Shared results
109
Claude Fable 5.1 only
24
Qwen3.8 Max (0902) only
5
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, Qwen3.8 Max (0902) 62.4 from 5 benchmarks.
Widest category
Math, 19.8 points apart on average over 7 shared benchmarks.
Widest single gap
LiveBench browser: Claude Fable 5.1 100.0% against Qwen3.8 Max (0902) 32.0%, 68.0 points apart on a 0 to 100 scale.
Output price
Claude Fable 5.1 $50.00 against Qwen3.8 Max (0902) $6.00 per million output tokens, 8.3x 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 5.1BarsQwen3.8 Max (0902)Ties
Coding210
Intelligence20
Agentic work161
Reasoning121
Math601 tie
Knowledge100
Web design701 tie
General301
All shared boards10432 ties
CodingLike-for-likeSix of these boards feed the Vibe Coding Index210
Coding benchmarks for Claude Fable 5.1 and Qwen3.8 Max (0902)
BenchmarkClaude Fable 5.1Qwen3.8 Max (0902)Leader
LiveBench coding97.7%60.3%Claude Fable 5.1
LMArena WebDev17431674Claude Fable 5.1
AA Coding Index81.676.2Claude Fable 5.1
LiveCodeBench (Vals AI)90.5%87.8%Claude Fable 5.1
SWE-bench Verified (Vals AI)Not measured85.6%Only Qwen3.8 Max (0902) measured
Terminal-Bench 4 (Vals AI)58.1%34.3%Claude Fable 5.1
Vibe Code Bench (Vals AI)90.3%64.7%Claude Fable 5.1
Code migration (Vals AI)54.6%24.0%Claude Fable 5.1
ProgramBench (Vals AI)7.0%0.0%Claude Fable 5.1
IOI (Vals AI)90.8%68.9%Claude Fable 5.1
Terminal-Bench 2.1 (Vals AI)85.0%67.4%Claude Fable 5.1
SWE-bench Multimodal (Vals AI)61.3%42.5%Claude Fable 5.1
Vibe Code Bench 1-100 (Vals AI)28.0%12.8%Claude Fable 5.1
SkillsBench (Vals AI)61.5%42.0%Claude Fable 5.1
CyberBench (Vals AI)70.4%28.6%Claude Fable 5.1
SciCode63.1%53.2%Claude Fable 5.1
FrontierCode50.9%Not measuredOnly Claude Fable 5.1 measured
FrontierSWE56.3%17.8%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%Not measuredOnly Claude Fable 5.1 measured
ALE-Bench2143.2Not measuredOnly Claude Fable 5.1 measured
LMArena Text: coding15321502Claude Fable 5.1
LMArena Text: software and IT15301498Claude Fable 5.1
LMArena WebDev: React17921692Claude Fable 5.1
LMArena WebDev: HTML16841649Claude Fable 5.1
LMArena WebDev: from an image17221637Claude Fable 5.1
SWE-Bench Pro V299.1%Not measuredOnly Claude Fable 5.1 measured
SWE Atlas: Codebase QnA60.0%Not measuredOnly Claude Fable 5.1 measured
SWE Atlas: Refactoring56.7%Not measuredOnly Claude Fable 5.1 measured
SWE Atlas: Test Writing67.0%Not measuredOnly Claude Fable 5.1 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 Qwen3.8 Max (0902)
BenchmarkClaude Fable 5.1Qwen3.8 Max (0902)Leader
AA Intelligence Index53.445.4Claude Fable 5.1
Epoch Capabilities Index166.5157.4Claude Fable 5.1
Agentic workLike-for-likePublic boards, shown as published, kept out of the index161
Agentic work benchmarks for Claude Fable 5.1 and Qwen3.8 Max (0902)
BenchmarkClaude Fable 5.1Qwen3.8 Max (0902)Leader
AA Agentic Index57.956.0Claude Fable 5.1
Design Arena: agents building web apps13181300Claude Fable 5.1
Design Arena: agents building full-stack apps13261305Claude Fable 5.1
Design Arena: agents building mobile apps12671224Claude Fable 5.1
Design Arena: agents building Android appsNot measured1190Only Qwen3.8 Max (0902) measured
Design Arena: agents building Godot games13271234Claude Fable 5.1
Design Arena: PowerPoint slides13071232Claude Fable 5.1
Design Arena: spreadsheets1394993Claude Fable 5.1
LiveBench research82.0%69.9%Claude Fable 5.1
LiveBench browser100.0%32.0%Claude Fable 5.1
LiveBench long agentic80.8%42.3%Claude Fable 5.1
SREBench (Vals AI)22.9%Not measuredOnly Claude Fable 5.1 measured
Finance Agent (Vals AI)58.9%50.6%Claude Fable 5.1
Tax Agent Bench (Vals AI)49.2%32.1%Claude Fable 5.1
Legal Research Bench (Vals AI)55.3%47.6%Claude Fable 5.1
Excel Modeling Benchmark (Vals AI)76.7%60.1%Claude Fable 5.1
Terminal-Bench-Science (Vals AI)40.0%12.9%Claude Fable 5.1
Time Horizon Index (Vals AI)63.3%Not measuredOnly Claude Fable 5.1 measured
CUA-bench (Vals AI)13.2%Not measuredOnly Claude Fable 5.1 measured
Robo-bench (Vals AI)5.8%Not measuredOnly Claude Fable 5.1 measured
APEX-Agents68.6%63.3%Claude Fable 5.1
Remote Labor Index17.9%Not measuredOnly Claude Fable 5.1 measured
SpireClimb2.0%Not measuredOnly Claude Fable 5.1 measured
Vending-Bench 2$5,422Not measuredOnly Claude Fable 5.1 measured
LMArena Search12461261Qwen3.8 Max (0902)
MCP Atlas87.2%Not measuredOnly Claude Fable 5.1 measured
Neither model has a result on the other 16 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index121
Reasoning benchmarks for Claude Fable 5.1 and Qwen3.8 Max (0902)
BenchmarkClaude Fable 5.1Qwen3.8 Max (0902)Leader
GPQA Diamond93.4%93.7%Qwen3.8 Max (0902)
LiveBench reasoning91.7%88.2%Claude Fable 5.1
MysteryMechanism (Vals AI)47.8%23.9%Claude Fable 5.1
MMMU Pro (Vals AI)90.6%88.0%Claude Fable 5.1
GPQA Diamond (Artificial Analysis run)93.7%92.8%Claude Fable 5.1
Humanity's Last Exam (Artificial Analysis run)59.1%43.1%Claude Fable 5.1
GPQA Diamond (Epoch AI run)Not measured92.7%Only Qwen3.8 Max (0902) measured
ARC-AGI97.5%Not measuredOnly Claude Fable 5.1 measured
ARC-AGI-290.0%Not measuredOnly Claude Fable 5.1 measured
Chess puzzles48.0%46.0%Claude Fable 5.1
Mystery game puzzles58.0%38.0%Claude Fable 5.1
EBR-bench57.1%Not measuredOnly Claude Fable 5.1 measured
LMArena Text: hard prompts15281496Claude Fable 5.1
LMArena Text: expert15441507Claude Fable 5.1
LMArena Text: hard prompts in English15221503Claude Fable 5.1
LMArena Vision: diagrams13431323Claude Fable 5.1
LMArena Vision: homework13451336Claude Fable 5.1
Humanity's Last Exam (Scale run)51.3%Not 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 index60
Math benchmarks for Claude Fable 5.1 and Qwen3.8 Max (0902)
BenchmarkClaude Fable 5.1Qwen3.8 Max (0902)Leader
OTIS Mock AIME100.0%100.0%Tie
FrontierMath, tiers 1 to 390.2%74.7%Claude Fable 5.1
FrontierMath, tier 487.8%46.3%Claude Fable 5.1
ProofBench100.0%58.0%Claude Fable 5.1
LMArena Text: math15311501Claude Fable 5.1
LMArena Text: mathematical work15411491Claude Fable 5.1
MathArena78.1%51.6%Claude Fable 5.1
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index100
Knowledge benchmarks for Claude Fable 5.1 and Qwen3.8 Max (0902)
BenchmarkClaude Fable 5.1Qwen3.8 Max (0902)Leader
MMLU Pro92.4%88.6%Claude Fable 5.1
LegalBench (Vals AI)88.5%83.6%Claude Fable 5.1
CorpFin (Vals AI)Not measured65.8%Only Qwen3.8 Max (0902) measured
TaxEval (Vals AI)76.0%75.5%Claude Fable 5.1
MortgageTax (Vals AI)70.8%64.0%Claude Fable 5.1
MedCode (Vals AI)53.5%40.7%Claude Fable 5.1
SimpleQA Verified70.8%47.3%Claude Fable 5.1
LMArena Text: science15321512Claude Fable 5.1
LMArena Text: medicine and healthcare15311503Claude Fable 5.1
LMArena Text: legal and government15141492Claude Fable 5.1
LMArena Text: business and finance14931480Claude Fable 5.1
PRBench Finance50.8%Not measuredOnly Claude Fable 5.1 measured
PRBench Legal51.6%Not measuredOnly Claude Fable 5.1 measured
Neither model has a result on the other 7 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index70
Web design benchmarks for Claude Fable 5.1 and Qwen3.8 Max (0902)
BenchmarkClaude Fable 5.1Qwen3.8 Max (0902)Leader
Design Arena: websites13121275Claude Fable 5.1
Design Arena: UI components13361336Tie
Design Arena: game dev13811312Claude Fable 5.1
Design Arena: data viz13451282Claude Fable 5.1
Design Arena: 3D13921336Claude Fable 5.1
Design Arena: all code categories13351292Claude Fable 5.1
Design Arena: SVG1300Not measuredOnly Claude Fable 5.1 measured
Design Arena: ASCII art13231200Claude Fable 5.1
LiveBench design83.4%78.6%Claude Fable 5.1
GeneralLike-for-likePublic boards, shown as published, kept out of the index301
General benchmarks for Claude Fable 5.1 and Qwen3.8 Max (0902)
BenchmarkClaude Fable 5.1Qwen3.8 Max (0902)Leader
LiveBench data analysis80.3%78.4%Claude Fable 5.1
Public Benefits Bench (Vals AI)74.9%67.1%Claude Fable 5.1
SAGE (Vals AI)48.5%51.2%Qwen3.8 Max (0902)
MedScribe (Vals AI)91.3%85.0%Claude Fable 5.1
Vals Multimodal IndexNot measured65.4%Only Qwen3.8 Max (0902) measured
Long context reasoning (AA-LCR)85.3%80.3%Claude Fable 5.1
DTBench97.6%92.0%Claude Fable 5.1
LMCA65.5%46.2%Claude Fable 5.1
Furniture assembly70.0%20.0%Claude Fable 5.1
LMArena Text15121483Claude Fable 5.1
LMArena Text: instruction following15181481Claude Fable 5.1
LMArena Text: creative writing15091477Claude Fable 5.1
LMArena Vision13191313Claude Fable 5.1
LMArena Text: English15061491Claude Fable 5.1
LMArena Text: non-English15081473Claude Fable 5.1
LMArena Text: Chinese15841539Claude Fable 5.1
LMArena Text: German14991478Claude Fable 5.1
LMArena Text: Japanese15621473Claude Fable 5.1
LMArena Text: Korean15171460Claude Fable 5.1
LMArena Text: French15231498Claude Fable 5.1
LMArena Text: Spanish15201489Claude Fable 5.1
LMArena Text: Russian15201482Claude Fable 5.1
LMArena Text: Polish15251471Claude Fable 5.1
LMArena Text: multi-turn14931489Claude Fable 5.1
LMArena Text: longer queries15241488Claude Fable 5.1
LMArena Text: writing and language15101477Claude Fable 5.1
LMArena Text: entertainment and media14971464Claude Fable 5.1
LMArena Vision: English13131311Claude Fable 5.1
LMArena Vision: Chinese13911358Claude Fable 5.1
LMArena Vision: reading text13271322Claude Fable 5.1
LMArena Vision: humor13181304Claude Fable 5.1
LMArena Vision: creative writing13301312Claude Fable 5.1
Neither model has a result on the other 16 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 Qwen3.8 Max (0902)
BenchmarkClaude Fable 5.1Qwen3.8 Max (0902)Leader
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
Qwen3.8 Max (0902)$0.0050Fits in one request

Qwen3.8 Max (0902) costs less

Repository review

50K input + 3K output tokens

Claude Fable 5.1$0.650Fits in one request
Qwen3.8 Max (0902)$0.118Fits in one request

Qwen3.8 Max (0902) costs less

Agent loop

200K input + 10K output tokens

Claude Fable 5.1$2.50Fits in one request
Qwen3.8 Max (0902)$0.460Fits in one request

Qwen3.8 Max (0902) 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 Qwen3.8 Max (0902)
SpecificationAnthropic Claude Fable 5.1Qwen3.8 Max (0902)
MakerAnthropicQwen
WeightsNo public weights listedNo public weights listed
ReleasedSeptember 1, 2026September 3, 2026
Context window1M1M
Input $/Mtok$10.00$2.00
Output $/Mtok$50.00$6.00
Coding index84.262.4
Independent measurements behind it55
Cost per solved taskNot computable$1.32
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Fable 5.1 better than Qwen3.8 Max (0902) for coding?

Pick Claude Fable 5.1 for coding: it scores 84.2 on the Vibe Coding Index against 62.4 for Qwen3.8 Max (0902). Pick Qwen3.8 Max (0902) for output tokens 8.3x cheaper ($6.00 vs $50.00 per million) and work measured by LMArena Search or GPQA Diamond, where it leads.

Which is cheaper, Claude Fable 5.1 or Qwen3.8 Max (0902)?

Claude Fable 5.1 costs $10.00 per million input tokens and $50.00 per million output tokens; Qwen3.8 Max (0902) costs $2.00 and $6.00. Cost per solved task is known for Qwen3.8 Max (0902) only.

Which has the bigger context window, Claude Fable 5.1 or Qwen3.8 Max (0902)?

Neither: both take 1M tokens.

How many benchmarks is the Claude Fable 5.1 vs Qwen3.8 Max (0902) comparison based on?

109 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 Qwen3.8 Max (0902)'s on 5. Where only one model has a result, the page says so instead of naming a winner.

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