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Claude Fable 5 vs GPT-6 Sol

Updated October 21, 2026. 93 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 Replace GPT-6 Sol
Claude Fable 5Anthropic
Coding
82.1
Overall
49.6
Output $/M
$50.00
67
GPT-6 SolOpenAI
Coding
82.8
Overall
47.6
Output $/M
$10.00
23
vs boards won of 93 shared, 3 tied

Decision reading

Claude Fable 5 and GPT-6 Sol are level for coding, 82.1 against 82.8 on the Vibe Coding Index, so price and context decide.

Pick Claude Fable 5 when what matters is LiveBench coding or Vibe Code Bench (Vals AI), where it leads. 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 5Anthropic82.1/1002 independent benchmarks$2.16 per solved taskModel BGPT-6 SolOpenAI82.8/1002 independent benchmarksNo cost per solved task
Shared results
93
Claude Fable 5 only
33
GPT-6 Sol only
7
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 82.1 from 2 benchmarks, GPT-6 Sol 82.8 from 2 benchmarks.
Widest category
Knowledge, 15.2 points apart on average over 6 shared benchmarks.
Widest single gap
Vending-Bench 2: Claude Fable 5 $5,680 against GPT-6 Sol $14,428, 54.7 points apart on a 0 to 100 scale.
Output price
Claude Fable 5 $50.00 against GPT-6 Sol $10.00 per million output tokens, 5.0x apart.
Context window
Claude Fable 5 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 5BarsGPT-6 SolTies
Coding681 tie
Intelligence11
Agentic work931 tie
Reasoning85
Math411 tie
Knowledge60
Web design72
General263
All shared boards67233 ties
CodingLike-for-likeFour of these boards feed the Vibe Coding Index68
Coding benchmarks for Claude Fable 5 and GPT-6 Sol
BenchmarkClaude Fable 5GPT-6 SolLeader
LiveBench coding98.3%93.1%Claude Fable 5
LMArena WebDev16241683GPT-6 Sol
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%44.4%GPT-6 Sol
Vibe Code Bench (Vals AI)90.3%87.8%Claude Fable 5
Code migration (Vals AI)55.1%57.2%GPT-6 Sol
ProgramBench (Vals AI)2.0%2.0%Tie
IOI (Vals AI)Not measured82.6%Only GPT-6 Sol measured
Terminal-Bench 2.1 (Vals AI)80.5%83.2%GPT-6 Sol
CyberBench (Vals AI)Not measured78.0%Only GPT-6 Sol measured
SciCode61.0%57.6%Claude Fable 5
Terminal-Bench Hard (Artificial Analysis run)62.9%Not measuredOnly Claude Fable 5 measured
FrontierCode53.5%49.3%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-Bench2041.32462.0GPT-6 Sol
LMArena Text: coding15181448Claude Fable 5
LMArena Text: software and IT15131433Claude Fable 5
LMArena WebDev: React16311685GPT-6 Sol
LMArena WebDev: HTML16511685GPT-6 Sol
LMArena WebDev: from an image16231660GPT-6 Sol
Neither model has a result on the other 13 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index11
Intelligence benchmarks for Claude Fable 5 and GPT-6 Sol
BenchmarkClaude Fable 5GPT-6 SolLeader
AA Intelligence Index49.647.6Claude Fable 5
Epoch Capabilities Index163.4163.7GPT-6 Sol
Agentic workLike-for-likePublic boards, shown as published, kept out of the index93
Agentic work benchmarks for Claude Fable 5 and GPT-6 Sol
BenchmarkClaude Fable 5GPT-6 SolLeader
AA Agentic Index50.7Not measuredOnly Claude Fable 5 measured
Design Arena: agents building web apps12611232Claude Fable 5
Design Arena: agents building full-stack apps12801238Claude Fable 5
Design Arena: agents building mobile apps12641216Claude Fable 5
Design Arena: agents building Android apps1289Not 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 slides1277Not measuredOnly Claude Fable 5 measured
Design Arena: PowerPoint slides1295Not measuredOnly Claude Fable 5 measured
LiveBench research86.9%69.3%Claude Fable 5
LiveBench browser92.0%92.0%Tie
LiveBench long agentic53.2%66.9%GPT-6 Sol
SREBench (Vals AI)Not measured30.5%Only GPT-6 Sol measured
Finance Agent (Vals AI)56.3%49.0%Claude Fable 5
Tax Agent Bench (Vals AI)38.3%15.0%Claude Fable 5
Legal Research Bench (Vals AI)49.5%28.9%Claude Fable 5
Excel Modeling Benchmark (Vals AI)73.7%71.5%Claude Fable 5
BioMysteryBench (Vals AI)Not measured74.8%Only GPT-6 Sol measured
Terminal-Bench-Science (Vals AI)15.7%30.0%GPT-6 Sol
Vals Science IndexNot measured45.0%Only GPT-6 Sol measured
τ²-Bench Telecom98.5%Not measuredOnly Claude Fable 5 measured
APEX-Agents63.6%54.3%Claude Fable 5
Remote Labor Index16.1%Not measuredOnly Claude Fable 5 measured
PostTrainBench41.8%Not measuredOnly Claude Fable 5 measured
SpireClimbNot measured7.5%Only GPT-6 Sol measured
Vending-Bench 2$5,680$14,428GPT-6 Sol
LMArena Search1229Not measuredOnly Claude Fable 5 measured
Neither model has a result on the other 12 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index85
Reasoning benchmarks for Claude Fable 5 and GPT-6 Sol
BenchmarkClaude Fable 5GPT-6 SolLeader
GPQA Diamond93.2%Not measuredOnly Claude Fable 5 measured
LiveBench reasoning89.7%88.7%Claude Fable 5
MysteryMechanism (Vals AI)Not measured30.2%Only GPT-6 Sol 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%47.9%Claude Fable 5
GPQA Diamond (Epoch AI run)85.9%94.3%GPT-6 Sol
ARC-AGI98.5%95.5%Claude Fable 5
ARC-AGI-289.2%89.6%GPT-6 Sol
SimpleBench81.9%Not measuredOnly Claude Fable 5 measured
Chess puzzles47.0%56.0%GPT-6 Sol
Mystery game puzzles52.0%56.0%GPT-6 Sol
EBR-bench39.5%53.3%GPT-6 Sol
LMArena Text: hard prompts15071422Claude Fable 5
LMArena Text: expert15341437Claude Fable 5
LMArena Text: hard prompts in English15091420Claude Fable 5
LMArena Vision: diagrams13571270Claude Fable 5
LMArena Vision: homework13611286Claude Fable 5
Neither model has a result on the other 3 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index41
Math benchmarks for Claude Fable 5 and GPT-6 Sol
BenchmarkClaude Fable 5GPT-6 SolLeader
OTIS Mock AIME100.0%100.0%Tie
FrontierMath, tiers 1 to 387.0%89.8%GPT-6 Sol
FrontierMath, tier 490.2%90.0%Claude Fable 5
ProofBench95.0%83.0%Claude Fable 5
LMArena Text: math15161407Claude Fable 5
LMArena Text: mathematical work15151424Claude Fable 5
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 and GPT-6 Sol
BenchmarkClaude Fable 5GPT-6 SolLeader
MMLU Pro91.5%Not measuredOnly Claude Fable 5 measured
LegalBench (Vals AI)88.6%Not measuredOnly Claude Fable 5 measured
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%47.1%Claude Fable 5
SimpleQA Verified70.7%60.7%Claude Fable 5
LMArena Text: science15061389Claude Fable 5
LMArena Text: medicine and healthcare14801366Claude Fable 5
LMArena Text: legal and government14981396Claude Fable 5
LMArena Text: business and finance14801380Claude Fable 5
Neither model has a result on the other 6 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index72
Web design benchmarks for Claude Fable 5 and GPT-6 Sol
BenchmarkClaude Fable 5GPT-6 SolLeader
Design Arena: websites12961292Claude Fable 5
Design Arena: UI components13181292Claude Fable 5
Design Arena: game dev13361313Claude Fable 5
Design Arena: data viz13041269Claude Fable 5
Design Arena: 3D13191322GPT-6 Sol
Design Arena: all code categories13101301Claude Fable 5
Design Arena: SVG13021318GPT-6 Sol
Design Arena: ASCII art13281226Claude Fable 5
LiveBench design84.7%82.2%Claude Fable 5
GeneralLike-for-likePublic boards, shown as published, kept out of the index263
General benchmarks for Claude Fable 5 and GPT-6 Sol
BenchmarkClaude Fable 5GPT-6 SolLeader
LiveBench data analysis80.5%81.2%GPT-6 Sol
Public Benefits Bench (Vals AI)70.4%56.6%Claude Fable 5
SAGE (Vals AI)51.9%44.8%Claude Fable 5
MedScribe (Vals AI)88.5%82.0%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%83.7%GPT-6 Sol
DTBench98.4%97.3%Claude Fable 5
LMCA61.2%59.1%Claude Fable 5
Surface Evolver Bench95.0%Not measuredOnly Claude Fable 5 measured
Furniture assembly35.8%58.3%GPT-6 Sol
LMArena Text14911398Claude Fable 5
LMArena Text: instruction following15021413Claude Fable 5
LMArena Text: creative writing14941378Claude Fable 5
LMArena Vision13251240Claude Fable 5
LMArena Text: English14981396Claude Fable 5
LMArena Text: non-English14821388Claude Fable 5
LMArena Text: Chinese15431412Claude Fable 5
LMArena Text: German14861379Claude Fable 5
LMArena Text: Japanese15041377Claude Fable 5
LMArena Text: Korean14871336Claude Fable 5
LMArena Text: French15051399Claude Fable 5
LMArena Text: Spanish14981387Claude Fable 5
LMArena Text: Russian15031402Claude Fable 5
LMArena Text: Polish14941372Claude Fable 5
LMArena Text: multi-turn15041414Claude Fable 5
LMArena Text: longer queries15101416Claude Fable 5
LMArena Text: writing and language15011389Claude Fable 5
LMArena Text: entertainment and media14821373Claude Fable 5
LMArena Vision: English13231229Claude Fable 5
LMArena Vision: Chinese1373Not measuredOnly Claude Fable 5 measured
LMArena Vision: reading text13371258Claude Fable 5
LMArena Vision: humor1341Not measuredOnly Claude Fable 5 measured
LMArena Vision: creative writing13381219Claude 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 GPT-6 Sol
BenchmarkClaude Fable 5GPT-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$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$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$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 and GPT-6 Sol
SpecificationAnthropic Claude Fable 5OpenAI GPT-6 Sol
MakerAnthropicOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedJune 9, 2026September 22, 2026
Context window1M1.05M
Input $/Mtok$10.00$2.00
Output $/Mtok$50.00$10.00
Coding index82.182.8
Independent measurements behind it22
Cost per solved task$2.16Not computable
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Fable 5 better than GPT-6 Sol for coding?

Claude Fable 5 and GPT-6 Sol are level for coding, 82.1 against 82.8 on the Vibe Coding Index, so price and context decide. Pick Claude Fable 5 when what matters is LiveBench coding or Vibe Code Bench (Vals AI), where it leads. 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 or GPT-6 Sol?

Claude Fable 5 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 Claude Fable 5 only.

Which has the bigger context window, Claude Fable 5 or GPT-6 Sol?

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

How many benchmarks is the Claude Fable 5 vs GPT-6 Sol comparison based on?

93 benchmarks have a result for both models as of October 21, 2026. Claude Fable 5'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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