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Claude Fable 5 vs GPT-5.6 Sol

Claude Fable 5 leads GPT-5.6 Sol on coding, 79.3 to 73.5 on the Vibe Coding Index, and GPT-5.6 Sol costs 2.5x less per output token ($20.00 vs $50.00 per million). Updated October 22, 2026; 125 benchmarks have a result for both.

Replace Claude Fable 5 Replace GPT-5.6 Sol
Claude Fable 5Anthropic
Coding
79.3
Overall
79.0
Output $/M
$50.00
95
GPT-5.6 SolOpenAI
Coding
73.5
Overall
74.7
Output $/M
$20.00
29
vs boards won of 125 shared, 1 tied

Claude Fable 5 or GPT-5.6 Sol: which to pick

Pick Claude Fable 5 for coding: it scores 79.3 on the Vibe Coding Index against 73.5 for GPT-5.6 Sol.

Pick GPT-5.6 Sol for output tokens 2.5x cheaper ($20.00 vs $50.00 per million) and a lower cost per solved task ($1.20 against $2.16).

Model AClaude Fable 5Anthropic79.3/1006 independent benchmarks$2.16 per solved taskModel BGPT-5.6 SolOpenAI73.5/1006 independent benchmarks$1.20 per solved task
Shared results
125
Claude Fable 5 only
2
GPT-5.6 Sol only
14
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, GPT-5.6 Sol 73.5 from 6 benchmarks.
Widest category
Reasoning, 6.6 points apart on average over 18 shared benchmarks.
Widest single gap
MirrorCode: Claude Fable 5 63.9% against GPT-5.6 Sol 20.0%, 43.9 points apart on a 0 to 100 scale.
Output price
Claude Fable 5 $50.00 against GPT-5.6 Sol $20.00 per million output tokens, 2.5x apart.
Context window
Claude Fable 5 takes 1M tokens, GPT-5.6 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-5.6 SolTies
Coding185
Intelligence20
Agentic work174
Reasoning108
Math411 tie
Knowledge110
Web design27
General314
All shared boards95291 tie
CodingLike-for-likeSix of these boards feed the Vibe Coding Index185
Coding benchmarks for Claude Fable 5 and GPT-5.6 Sol
BenchmarkClaude Fable 5GPT-5.6 SolLeader
LiveBench coding98.3%89.7%Claude Fable 5
LMArena WebDev16241616Claude Fable 5
AA Coding Index76.577.4GPT-5.6 Sol
LiveCodeBench (Vals AI)89.8%82.6%Claude Fable 5
SWE-bench Verified (Vals AI)95.0%96.2%GPT-5.6 Sol
Terminal-Bench 4 (Vals AI)41.4%37.9%Claude Fable 5
Vibe Code Bench (Vals AI)90.3%80.5%Claude Fable 5
Code migration (Vals AI)55.1%52.9%Claude Fable 5
ProgramBench (Vals AI)2.0%1.5%Claude Fable 5
IOI (Vals AI)Not measured91.2%Only GPT-5.6 Sol measured
Terminal-Bench 2.1 (Vals AI)80.5%85.8%GPT-5.6 Sol
Vibe Code Bench 1-100 (Vals AI)Not measured20.0%Only GPT-5.6 Sol measured
SkillsBench (Vals AI)Not measured54.1%Only GPT-5.6 Sol measured
CyberBench (Vals AI)Not measured76.3%Only GPT-5.6 Sol measured
SciCode61.0%57.8%Claude Fable 5
Terminal-Bench Hard (Artificial Analysis run)62.9%65.9%GPT-5.6 Sol
FrontierCode53.5%47.5%Claude Fable 5
FrontierSWE47.0%32.2%Claude Fable 5
GSO-Bench78.4%76.5%Claude Fable 5
WeirdML91.9%88.8%Claude Fable 5
MirrorCode63.9%20.0%Claude Fable 5
ALE-Bench2041.32176.9GPT-5.6 Sol
LMArena Text: coding15181496Claude Fable 5
LMArena Text: software and IT15131489Claude Fable 5
LMArena WebDev: React16311620Claude Fable 5
LMArena WebDev: HTML16511618Claude Fable 5
LMArena WebDev: from an image16231609Claude Fable 5
SciCodeNot measured10.8%Only GPT-5.6 Sol measured
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 GPT-5.6 Sol
BenchmarkClaude Fable 5GPT-5.6 SolLeader
AA Intelligence Index49.647.0Claude Fable 5
Epoch Capabilities Index163.4162.8Claude Fable 5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index174
Agentic work benchmarks for Claude Fable 5 and GPT-5.6 Sol
BenchmarkClaude Fable 5GPT-5.6 SolLeader
AA Agentic Index50.750.2Claude Fable 5
Design Arena: agents building web apps12611245Claude Fable 5
Design Arena: agents building full-stack apps12801261Claude Fable 5
Design Arena: agents building mobile apps12641248Claude Fable 5
Design Arena: agents building Android apps12841240Claude Fable 5
Design Arena: agents building Godot games12921260Claude Fable 5
Design Arena: agents building games12851266Claude Fable 5
Design Arena: HTML slides12271236GPT-5.6 Sol
Design Arena: PowerPoint slides12701215Claude Fable 5
LiveBench research86.9%54.5%Claude Fable 5
LiveBench browser92.0%88.0%Claude Fable 5
LiveBench long agentic53.2%48.5%Claude Fable 5
SREBench (Vals AI)Not measured30.5%Only GPT-5.6 Sol measured
Finance Agent (Vals AI)56.3%53.8%Claude Fable 5
Tax Agent Bench (Vals AI)38.3%31.1%Claude Fable 5
Legal Research Bench (Vals AI)49.5%48.1%Claude Fable 5
Excel Modeling Benchmark (Vals AI)73.7%72.3%Claude Fable 5
BioMysteryBench (Vals AI)Not measured71.1%Only GPT-5.6 Sol measured
Terminal-Bench-Science (Vals AI)15.7%20.0%GPT-5.6 Sol
Vals Science IndexNot measured41.5%Only GPT-5.6 Sol measured
Time Horizon Index (Vals AI)Not measured23.8%Only GPT-5.6 Sol measured
CUA-bench (Vals AI)Not measured8.3%Only GPT-5.6 Sol measured
τ²-Bench Telecom98.5%85.1%Claude Fable 5
APEX-Agents63.6%Not measuredOnly Claude Fable 5 measured
Remote Labor Index16.1%Not measuredOnly Claude Fable 5 measured
OSWorld 2.0Not measured27.3%Only GPT-5.6 Sol measured
BALROGNot measured60.0%Only GPT-5.6 Sol measured
PostTrainBench41.8%36.2%Claude Fable 5
Vending-Bench 2$5,680$9,619GPT-5.6 Sol
LMArena Search12291261GPT-5.6 Sol
Neither model has a result on the other 11 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index108
Reasoning benchmarks for Claude Fable 5 and GPT-5.6 Sol
BenchmarkClaude Fable 5GPT-5.6 SolLeader
GPQA Diamond93.2%95.2%GPT-5.6 Sol
LiveBench reasoning89.7%91.7%GPT-5.6 Sol
MysteryMechanism (Vals AI)Not measured33.3%Only GPT-5.6 Sol measured
MMMU Pro (Vals AI)89.3%88.8%Claude Fable 5
GPQA Diamond (Artificial Analysis run)92.6%94.1%GPT-5.6 Sol
Humanity's Last Exam (Artificial Analysis run)55.5%49.5%Claude Fable 5
GPQA Diamond (Epoch AI run)85.9%93.5%GPT-5.6 Sol
ARC-AGI98.5%97.5%Claude Fable 5
ARC-AGI-289.2%92.5%GPT-5.6 Sol
SimpleBench81.9%64.8%Claude Fable 5
Chess puzzles47.0%59.0%GPT-5.6 Sol
Mystery game puzzles52.0%58.0%GPT-5.6 Sol
EBR-bench39.5%44.8%GPT-5.6 Sol
LMArena Text: hard prompts15071483Claude Fable 5
LMArena Text: expert15341517Claude Fable 5
LMArena Text: hard prompts in English15091477Claude Fable 5
LMArena Vision: diagrams13571305Claude Fable 5
LMArena Vision: homework13611305Claude Fable 5
Kagi LLM Benchmark91.4%67.0%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 index41
Math benchmarks for Claude Fable 5 and GPT-5.6 Sol
BenchmarkClaude Fable 5GPT-5.6 SolLeader
OTIS Mock AIME100.0%100.0%Tie
FrontierMath, tiers 1 to 387.0%89.1%GPT-5.6 Sol
FrontierMath, tier 490.2%82.9%Claude Fable 5
ProofBench95.0%83.0%Claude Fable 5
LMArena Text: math15161473Claude Fable 5
LMArena Text: mathematical work15151496Claude Fable 5
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index110
Knowledge benchmarks for Claude Fable 5 and GPT-5.6 Sol
BenchmarkClaude Fable 5GPT-5.6 SolLeader
MMLU Pro91.5%89.1%Claude Fable 5
LegalBench (Vals AI)88.6%87.0%Claude Fable 5
CorpFin (Vals AI)71.8%64.4%Claude Fable 5
TaxEval (Vals AI)76.9%74.8%Claude Fable 5
MortgageTax (Vals AI)68.9%67.3%Claude Fable 5
MedCode (Vals AI)56.1%44.0%Claude Fable 5
SimpleQA Verified70.7%69.7%Claude Fable 5
LMArena Text: science15061455Claude Fable 5
LMArena Text: medicine and healthcare14801431Claude Fable 5
LMArena Text: legal and government14981476Claude Fable 5
LMArena Text: business and finance14801457Claude Fable 5
FACTS Benchmark SuiteNot measured52.4%Only GPT-5.6 Sol measured
Neither model has a result on the other 6 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index27
Web design benchmarks for Claude Fable 5 and GPT-5.6 Sol
BenchmarkClaude Fable 5GPT-5.6 SolLeader
Design Arena: websites12951321GPT-5.6 Sol
Design Arena: UI components13161335GPT-5.6 Sol
Design Arena: game dev13351367GPT-5.6 Sol
Design Arena: data viz13041322GPT-5.6 Sol
Design Arena: 3D13181384GPT-5.6 Sol
Design Arena: all code categories13101341GPT-5.6 Sol
Design Arena: SVG13021314GPT-5.6 Sol
Design Arena: ASCII art13291304Claude Fable 5
LiveBench design84.7%81.6%Claude Fable 5
GeneralLike-for-likePublic boards, shown as published, kept out of the index314
General benchmarks for Claude Fable 5 and GPT-5.6 Sol
BenchmarkClaude Fable 5GPT-5.6 SolLeader
LiveBench data analysis80.5%79.8%Claude Fable 5
Public Benefits Bench (Vals AI)70.4%66.5%Claude Fable 5
SAGE (Vals AI)51.9%52.6%GPT-5.6 Sol
MedScribe (Vals AI)88.5%85.2%Claude Fable 5
Vals Multimodal Index74.2%72.6%Claude Fable 5
IFBench63.5%72.7%GPT-5.6 Sol
Long context reasoning (AA-LCR)82.3%84.0%GPT-5.6 Sol
DTBench98.4%95.7%Claude Fable 5
LMCA61.2%58.5%Claude Fable 5
Surface Evolver Bench95.0%93.1%Claude Fable 5
Furniture assembly35.8%56.7%GPT-5.6 Sol
LMArena Text14911457Claude Fable 5
LMArena Text: instruction following15021483Claude Fable 5
LMArena Text: creative writing14941449Claude Fable 5
LMArena Vision13251281Claude Fable 5
LMArena Text: English14981457Claude Fable 5
LMArena Text: non-English14821451Claude Fable 5
LMArena Text: Chinese15431525Claude Fable 5
LMArena Text: German14861476Claude Fable 5
LMArena Text: Japanese15041472Claude Fable 5
LMArena Text: Korean14871442Claude Fable 5
LMArena Text: French15051472Claude Fable 5
LMArena Text: Spanish14981443Claude Fable 5
LMArena Text: Russian15031471Claude Fable 5
LMArena Text: Polish14941459Claude Fable 5
LMArena Text: multi-turn15041461Claude Fable 5
LMArena Text: longer queries15101481Claude Fable 5
LMArena Text: writing and language15011462Claude Fable 5
LMArena Text: entertainment and media14821450Claude Fable 5
LMArena Vision: English13231280Claude Fable 5
LMArena Vision: Chinese13731313Claude Fable 5
LMArena Vision: reading text13371290Claude Fable 5
LMArena Vision: humor13411246Claude Fable 5
LMArena Vision: creative writing13381283Claude Fable 5
LMArena Document14961483Claude Fable 5
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-5.6 Sol
BenchmarkClaude Fable 5GPT-5.6 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-5.6 Sol$0.014Fits in one request

GPT-5.6 Sol costs less

Repository review

50K input + 3K output tokens

Claude Fable 5$0.650Fits in one request
GPT-5.6 Sol$0.260Fits in one request

GPT-5.6 Sol costs less

Agent loop

200K input + 10K output tokens

Claude Fable 5$2.50Fits in one request
GPT-5.6 Sol$1.00Fits in one request

GPT-5.6 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-5.6 Sol
SpecificationAnthropic Claude Fable 5OpenAI GPT-5.6 Sol
MakerAnthropicOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedJune 9, 2026July 9, 2026
Context window1M1.05M
Input $/Mtok$10.00$4.00
Output $/Mtok$50.00$20.00
Coding index79.373.5
Independent measurements behind it66
Cost per solved task$2.16$1.20
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Fable 5 better than GPT-5.6 Sol for coding?

Pick Claude Fable 5 for coding: it scores 79.3 on the Vibe Coding Index against 73.5 for GPT-5.6 Sol. Pick GPT-5.6 Sol for output tokens 2.5x cheaper ($20.00 vs $50.00 per million) and a lower cost per solved task ($1.20 against $2.16).

Which is cheaper, Claude Fable 5 or GPT-5.6 Sol?

Claude Fable 5 costs $10.00 per million input tokens and $50.00 per million output tokens; GPT-5.6 Sol costs $4.00 and $20.00. Per solved SWE-bench Verified task, Claude Fable 5 costs $2.16 and GPT-5.6 Sol $1.20.

Which has the bigger context window, Claude Fable 5 or GPT-5.6 Sol?

GPT-5.6 Sol, with 1.05M tokens against 1M.

How many benchmarks is the Claude Fable 5 vs GPT-5.6 Sol comparison based on?

125 benchmarks have a result for both models as of October 22, 2026. Claude Fable 5's coding index rests on 6 independent benchmarks and GPT-5.6 Sol's on 6. Where only one model has a result, the page says so instead of naming a winner.

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