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Claude Fable 5.1 vs GPT-6 Sol

Updated October 21, 2026. 97 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace Claude Fable 5.1 Replace GPT-6 Sol
Claude Fable 5.1Anthropic
Coding
89.1
Overall
53.4
Output $/M
$50.00
85
GPT-6 SolOpenAI
Coding
82.8
Overall
47.6
Output $/M
$10.00
11
vs boards won of 97 shared, 1 tied

Decision reading

Pick Claude Fable 5.1 for coding: it scores 89.1 on the Vibe Coding Index against 82.8 for GPT-6 Sol.

Pick GPT-6 Sol when output tokens cost 5.0x less, or when the context window is larger, 1.05M against 1M tokens.

Model AClaude Fable 5.1Anthropic89.1/1002 independent benchmarksNo cost per solved taskModel BGPT-6 SolOpenAI82.8/1002 independent benchmarksNo cost per solved task
Shared results
97
Claude Fable 5.1 only
27
GPT-6 Sol only
3
Like-for-like categories
8 of 9

Shared results can support a head-to-head reading. Results only one model has describe coverage, not superiority.

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 89.1 from 2 benchmarks, GPT-6 Sol 82.8 from 2 benchmarks.
Widest category
Knowledge, 17.7 points apart on average over 6 shared benchmarks.
Widest single gap
Vending-Bench 2: Claude Fable 5.1 $5,422 against GPT-6 Sol $14,428, 56.3 points apart on a 0 to 100 scale.
Output price
Claude Fable 5.1 $50.00 against GPT-6 Sol $10.00 per million output tokens, 5.0x apart.
Context window
Claude Fable 5.1 takes 1M tokens, GPT-6 Sol 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 5.1BarsGPT-6 SolTies
Coding134
Intelligence20
Agentic work123
Reasoning121
Math411 tie
Knowledge60
Web design81
General281
All shared boards85111 tie
CodingLike-for-likeFour of these boards feed the Vibe Coding Index134
Coding benchmarks for Claude Fable 5.1 and GPT-6 Sol
BenchmarkClaude Fable 5.1GPT-6 SolLeader
LiveBench coding97.7%93.1%Claude Fable 5.1
LMArena WebDev17431683Claude Fable 5.1
AA Coding Index81.6Not measuredOnly Claude Fable 5.1 measured
LiveCodeBench (Vals AI)90.5%Not measuredOnly Claude Fable 5.1 measured
Terminal-Bench 4 (Vals AI)58.1%44.4%Claude Fable 5.1
Vibe Code Bench (Vals AI)90.3%87.8%Claude Fable 5.1
Code migration (Vals AI)54.6%57.2%GPT-6 Sol
ProgramBench (Vals AI)7.0%2.0%Claude Fable 5.1
IOI (Vals AI)90.8%82.6%Claude Fable 5.1
Terminal-Bench 2.1 (Vals AI)85.0%83.2%Claude Fable 5.1
SWE-bench Multimodal (Vals AI)61.3%Not measuredOnly Claude Fable 5.1 measured
Vibe Code Bench 1-100 (Vals AI)28.0%Not measuredOnly Claude Fable 5.1 measured
SkillsBench (Vals AI)61.5%Not measuredOnly Claude Fable 5.1 measured
CyberBench (Vals AI)70.4%78.0%GPT-6 Sol
SciCode63.1%57.6%Claude Fable 5.1
FrontierCode50.9%49.3%Claude Fable 5.1
FrontierSWE56.3%Not measuredOnly Claude Fable 5.1 measured
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-Bench2143.22462.0GPT-6 Sol
LMArena Text: coding15321448Claude Fable 5.1
LMArena Text: software and IT15301433Claude Fable 5.1
LMArena WebDev: React17921685Claude Fable 5.1
LMArena WebDev: HTML16841685GPT-6 Sol
LMArena WebDev: from an image17221660Claude Fable 5.1
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 GPT-6 Sol
BenchmarkClaude Fable 5.1GPT-6 SolLeader
AA Intelligence Index53.447.6Claude Fable 5.1
Epoch Capabilities Index166.5163.7Claude Fable 5.1
Agentic workLike-for-likePublic boards, shown as published, kept out of the index123
Agentic work benchmarks for Claude Fable 5.1 and GPT-6 Sol
BenchmarkClaude Fable 5.1GPT-6 SolLeader
AA Agentic Index57.9Not measuredOnly Claude Fable 5.1 measured
Design Arena: agents building web apps13181232Claude Fable 5.1
Design Arena: agents building full-stack apps13261238Claude Fable 5.1
Design Arena: agents building mobile apps12671216Claude Fable 5.1
Design Arena: agents building Godot games1327Not measuredOnly Claude Fable 5.1 measured
Design Arena: PowerPoint slides1328Not measuredOnly Claude Fable 5.1 measured
Design Arena: spreadsheets1374Not measuredOnly Claude Fable 5.1 measured
LiveBench research82.0%69.3%Claude Fable 5.1
LiveBench browser100.0%92.0%Claude Fable 5.1
LiveBench long agentic80.8%66.9%Claude Fable 5.1
SREBench (Vals AI)22.9%30.5%GPT-6 Sol
Finance Agent (Vals AI)58.9%49.0%Claude Fable 5.1
Tax Agent Bench (Vals AI)49.2%15.0%Claude Fable 5.1
Legal Research Bench (Vals AI)55.3%28.9%Claude Fable 5.1
Excel Modeling Benchmark (Vals AI)76.7%71.5%Claude Fable 5.1
BioMysteryBench (Vals AI)Not measured74.8%Only GPT-6 Sol measured
Terminal-Bench-Science (Vals AI)40.0%30.0%Claude Fable 5.1
Vals Science IndexNot measured45.0%Only GPT-6 Sol measured
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%54.3%Claude Fable 5.1
Remote Labor Index17.9%Not measuredOnly Claude Fable 5.1 measured
SpireClimb2.0%7.5%GPT-6 Sol
Vending-Bench 2$5,422$14,428GPT-6 Sol
LMArena Search1246Not measuredOnly Claude Fable 5.1 measured
Neither model has a result on the other 13 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index121
Reasoning benchmarks for Claude Fable 5.1 and GPT-6 Sol
BenchmarkClaude Fable 5.1GPT-6 SolLeader
GPQA Diamond93.4%Not measuredOnly Claude Fable 5.1 measured
LiveBench reasoning91.7%88.7%Claude Fable 5.1
MysteryMechanism (Vals AI)47.8%30.2%Claude Fable 5.1
MMMU Pro (Vals AI)90.6%Not measuredOnly Claude Fable 5.1 measured
GPQA Diamond (Artificial Analysis run)93.7%Not measuredOnly Claude Fable 5.1 measured
Humanity's Last Exam (Artificial Analysis run)59.1%47.9%Claude Fable 5.1
GPQA Diamond (Epoch AI run)Not measured94.3%Only GPT-6 Sol measured
ARC-AGI97.5%95.5%Claude Fable 5.1
ARC-AGI-290.0%89.6%Claude Fable 5.1
Chess puzzles48.0%56.0%GPT-6 Sol
Mystery game puzzles58.0%56.0%Claude Fable 5.1
EBR-bench57.1%53.3%Claude Fable 5.1
LMArena Text: hard prompts15281422Claude Fable 5.1
LMArena Text: expert15441437Claude Fable 5.1
LMArena Text: hard prompts in English15221420Claude Fable 5.1
LMArena Vision: diagrams13431270Claude Fable 5.1
LMArena Vision: homework13451286Claude Fable 5.1
Neither model has a result on the other 4 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index41
Math benchmarks for Claude Fable 5.1 and GPT-6 Sol
BenchmarkClaude Fable 5.1GPT-6 SolLeader
OTIS Mock AIME100.0%100.0%Tie
FrontierMath, tiers 1 to 390.2%89.8%Claude Fable 5.1
FrontierMath, tier 487.8%90.0%GPT-6 Sol
ProofBench100.0%83.0%Claude Fable 5.1
LMArena Text: math15311407Claude Fable 5.1
LMArena Text: mathematical work15411424Claude 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 index60
Knowledge benchmarks for Claude Fable 5.1 and GPT-6 Sol
BenchmarkClaude Fable 5.1GPT-6 SolLeader
MMLU Pro92.4%Not measuredOnly Claude Fable 5.1 measured
LegalBench (Vals AI)88.5%Not measuredOnly Claude Fable 5.1 measured
TaxEval (Vals AI)76.0%Not measuredOnly Claude Fable 5.1 measured
MortgageTax (Vals AI)70.8%Not measuredOnly Claude Fable 5.1 measured
MedCode (Vals AI)53.5%47.1%Claude Fable 5.1
SimpleQA Verified70.8%60.7%Claude Fable 5.1
LMArena Text: science15321389Claude Fable 5.1
LMArena Text: medicine and healthcare15311366Claude Fable 5.1
LMArena Text: legal and government15141396Claude Fable 5.1
LMArena Text: business and finance14931380Claude Fable 5.1
Neither model has a result on the other 7 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index81
Web design benchmarks for Claude Fable 5.1 and GPT-6 Sol
BenchmarkClaude Fable 5.1GPT-6 SolLeader
Design Arena: websites13131292Claude Fable 5.1
Design Arena: UI components13381292Claude Fable 5.1
Design Arena: game dev13821313Claude Fable 5.1
Design Arena: data viz13441269Claude Fable 5.1
Design Arena: 3D13931322Claude Fable 5.1
Design Arena: all code categories13361301Claude Fable 5.1
Design Arena: SVG13011318GPT-6 Sol
Design Arena: ASCII art13241226Claude Fable 5.1
LiveBench design83.4%82.2%Claude Fable 5.1
GeneralLike-for-likePublic boards, shown as published, kept out of the index281
General benchmarks for Claude Fable 5.1 and GPT-6 Sol
BenchmarkClaude Fable 5.1GPT-6 SolLeader
LiveBench data analysis80.3%81.2%GPT-6 Sol
Public Benefits Bench (Vals AI)74.9%56.6%Claude Fable 5.1
SAGE (Vals AI)48.5%44.8%Claude Fable 5.1
MedScribe (Vals AI)91.3%82.0%Claude Fable 5.1
Long context reasoning (AA-LCR)85.3%83.7%Claude Fable 5.1
DTBench97.6%97.3%Claude Fable 5.1
LMCA65.5%59.1%Claude Fable 5.1
Furniture assembly70.0%58.3%Claude Fable 5.1
LMArena Text15121398Claude Fable 5.1
LMArena Text: instruction following15181413Claude Fable 5.1
LMArena Text: creative writing15091378Claude Fable 5.1
LMArena Vision13191240Claude Fable 5.1
LMArena Text: English15061396Claude Fable 5.1
LMArena Text: non-English15081388Claude Fable 5.1
LMArena Text: Chinese15841412Claude Fable 5.1
LMArena Text: German14991379Claude Fable 5.1
LMArena Text: Japanese15621377Claude Fable 5.1
LMArena Text: Korean15171336Claude Fable 5.1
LMArena Text: French15231399Claude Fable 5.1
LMArena Text: Spanish15201387Claude Fable 5.1
LMArena Text: Russian15201402Claude Fable 5.1
LMArena Text: Polish15251372Claude Fable 5.1
LMArena Text: multi-turn14931414Claude Fable 5.1
LMArena Text: longer queries15241416Claude Fable 5.1
LMArena Text: writing and language15101389Claude Fable 5.1
LMArena Text: entertainment and media14971373Claude Fable 5.1
LMArena Vision: English13131229Claude Fable 5.1
LMArena Vision: Chinese1391Not measuredOnly Claude Fable 5.1 measured
LMArena Vision: reading text13271258Claude Fable 5.1
LMArena Vision: humor1318Not measuredOnly Claude Fable 5.1 measured
LMArena Vision: creative writing13301219Claude Fable 5.1
Neither model has a result on the other 15 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 GPT-6 Sol
BenchmarkClaude Fable 5.1GPT-6 SolLeader
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
GPT-6 Sol$0.0070Fits in one request

GPT-6 Sol costs less

Repository review

50K input + 3K output tokens

Claude Fable 5.1$0.650Fits in one request
GPT-6 Sol$0.130Fits in one request

GPT-6 Sol costs less

Agent loop

200K input + 10K output tokens

Claude Fable 5.1$2.50Fits in one request
GPT-6 Sol$0.500Fits in one request

GPT-6 Sol 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 GPT-6 Sol
SpecificationAnthropic Claude Fable 5.1OpenAI GPT-6 Sol
MakerAnthropicOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedSeptember 1, 2026September 22, 2026
Context window1M1.05M
Input $/Mtok$10.00$2.00
Output $/Mtok$50.00$10.00
Coding index89.182.8
Independent measurements behind it22
Cost per solved taskNot computableNot computable
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Fable 5.1 better than GPT-6 Sol for coding?

Pick Claude Fable 5.1 for coding: it scores 89.1 on the Vibe Coding Index against 82.8 for GPT-6 Sol. Pick GPT-6 Sol when output tokens cost 5.0x less, or when the context window is larger, 1.05M against 1M tokens.

Which is cheaper, Claude Fable 5.1 or GPT-6 Sol?

Claude Fable 5.1 costs $10.00 per million input tokens and $50.00 per million output tokens; GPT-6 Sol costs $2.00 and $10.00. Cost per solved task is known for neither of them.

Which has the bigger context window, Claude Fable 5.1 or GPT-6 Sol?

GPT-6 Sol, with 1.05M tokens against 1M.

How many benchmarks is the Claude Fable 5.1 vs GPT-6 Sol comparison based on?

97 benchmarks have a result for both models as of October 21, 2026. Claude Fable 5.1's coding index rests on 2 independent benchmarks and GPT-6 Sol's on 2. Where only one model has a result, the page says so instead of naming a winner.

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