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Claude Fable 5.1 vs GPT-6.1 Sol

Updated October 21, 2026. 90 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-6.1 Sol
Claude Fable 5.1Anthropic
Coding
89.1
Overall
53.4
Output $/M
$50.00
63
GPT-6.1 SolOpenAI
Coding
88.7
Overall
51.8
Output $/M
$10.00
26
vs boards won of 90 shared, 1 tied

Decision reading

Claude Fable 5.1 and GPT-6.1 Sol are level for coding, 89.1 against 88.7 on the Vibe Coding Index, so price and context decide.

Pick GPT-6.1 Sol when output tokens cost 5.0x less, or when the context window is larger, 1.05M against 1M tokens. Pick Claude Fable 5.1 when what matters is LiveBench coding or Terminal-Bench 4 (Vals AI), where it leads.

Model AClaude Fable 5.1Anthropic89.1/1002 independent benchmarksNo cost per solved taskModel BGPT-6.1 SolOpenAI88.7/1002 independent benchmarksNo cost per solved task
Shared results
90
Claude Fable 5.1 only
34
GPT-6.1 Sol only
5
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-6.1 Sol 88.7 from 2 benchmarks.
Widest category
Agentic work, 14.1 points apart on average over 14 shared benchmarks.
Widest single gap
CyberBench (Vals AI): Claude Fable 5.1 70.4% against GPT-6.1 Sol 39.3%, 31.1 points apart on a 0 to 100 scale.
Output price
Claude Fable 5.1 $50.00 against GPT-6.1 Sol $10.00 per million output tokens, 5.0x apart.
Context window
Claude Fable 5.1 takes 1M tokens, GPT-6.1 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-6.1 SolTies
Coding125
Intelligence11
Agentic work95
Reasoning76
Math321 tie
Knowledge51
Web design34
General232
All shared boards63261 tie
CodingLike-for-likeFour of these boards feed the Vibe Coding Index125
Coding benchmarks for Claude Fable 5.1 and GPT-6.1 Sol
BenchmarkClaude Fable 5.1GPT-6.1 SolLeader
LiveBench coding97.7%96.0%Claude Fable 5.1
LMArena WebDev17431753GPT-6.1 Sol
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%55.0%Claude Fable 5.1
Vibe Code Bench (Vals AI)90.3%88.9%Claude Fable 5.1
Code migration (Vals AI)54.6%65.1%GPT-6.1 Sol
ProgramBench (Vals AI)7.0%3.0%Claude Fable 5.1
IOI (Vals AI)90.8%96.9%GPT-6.1 Sol
Terminal-Bench 2.1 (Vals AI)85.0%Not measuredOnly Claude Fable 5.1 measured
SWE-bench Multimodal (Vals AI)61.3%43.5%Claude Fable 5.1
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%39.3%Claude Fable 5.1
SciCode63.1%55.8%Claude Fable 5.1
FrontierCode50.9%50.2%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-Bench2143.22743.8GPT-6.1 Sol
LMArena Text: coding15321478Claude Fable 5.1
LMArena Text: software and IT15301476Claude Fable 5.1
LMArena WebDev: React17921754Claude Fable 5.1
LMArena WebDev: HTML16841800GPT-6.1 Sol
LMArena WebDev: from an image17221702Claude 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 index11
Intelligence benchmarks for Claude Fable 5.1 and GPT-6.1 Sol
BenchmarkClaude Fable 5.1GPT-6.1 SolLeader
AA Intelligence Index53.451.8Claude Fable 5.1
Epoch Capabilities Index166.5168.4GPT-6.1 Sol
Agentic workLike-for-likePublic boards, shown as published, kept out of the index95
Agentic work benchmarks for Claude Fable 5.1 and GPT-6.1 Sol
BenchmarkClaude Fable 5.1GPT-6.1 SolLeader
AA Agentic Index57.9Not measuredOnly Claude Fable 5.1 measured
Design Arena: agents building web apps1318Not measuredOnly Claude Fable 5.1 measured
Design Arena: agents building full-stack apps1326Not measuredOnly Claude Fable 5.1 measured
Design Arena: agents building mobile apps12671190Claude 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: spreadsheets13741250Claude Fable 5.1
LiveBench research82.0%83.5%GPT-6.1 Sol
LiveBench browser100.0%88.0%Claude Fable 5.1
LiveBench long agentic80.8%73.0%Claude Fable 5.1
SREBench (Vals AI)22.9%50.8%GPT-6.1 Sol
Finance Agent (Vals AI)58.9%52.0%Claude Fable 5.1
Tax Agent Bench (Vals AI)49.2%21.8%Claude Fable 5.1
Legal Research Bench (Vals AI)55.3%38.5%Claude Fable 5.1
Harvey's Legal Agent Benchmark (Vals AI)Not measured6.3%Only GPT-6.1 Sol measured
Excel Modeling Benchmark (Vals AI)76.7%70.8%Claude Fable 5.1
BioMysteryBench (Vals AI)Not measured79.6%Only GPT-6.1 Sol measured
Terminal-Bench-Science (Vals AI)40.0%52.9%GPT-6.1 Sol
Vals Science IndexNot measured59.6%Only GPT-6.1 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%28.3%GPT-6.1 Sol
APEX-Agents68.6%60.0%Claude Fable 5.1
Remote Labor Index17.9%Not measuredOnly Claude Fable 5.1 measured
SpireClimb2.0%24.7%GPT-6.1 Sol
Vending-Bench 2$5,422Not measuredOnly Claude Fable 5.1 measured
LMArena Search1246Not measuredOnly Claude Fable 5.1 measured
Neither model has a result on the other 12 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index76
Reasoning benchmarks for Claude Fable 5.1 and GPT-6.1 Sol
BenchmarkClaude Fable 5.1GPT-6.1 SolLeader
GPQA Diamond93.4%Not measuredOnly Claude Fable 5.1 measured
LiveBench reasoning91.7%92.6%GPT-6.1 Sol
MysteryMechanism (Vals AI)47.8%46.4%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%52.9%Claude Fable 5.1
GPQA Diamond (Epoch AI run)Not measured95.4%Only GPT-6.1 Sol measured
ARC-AGI97.5%98.5%GPT-6.1 Sol
ARC-AGI-290.0%94.2%GPT-6.1 Sol
Chess puzzles48.0%68.0%GPT-6.1 Sol
Mystery game puzzles58.0%80.0%GPT-6.1 Sol
EBR-bench57.1%54.3%Claude Fable 5.1
LMArena Text: hard prompts15281463Claude Fable 5.1
LMArena Text: expert15441489Claude Fable 5.1
LMArena Text: hard prompts in English15221465Claude Fable 5.1
LMArena Vision: diagrams13431306Claude Fable 5.1
LMArena Vision: homework13451356GPT-6.1 Sol
Neither model has a result on the other 4 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index32
Math benchmarks for Claude Fable 5.1 and GPT-6.1 Sol
BenchmarkClaude Fable 5.1GPT-6.1 SolLeader
OTIS Mock AIME100.0%100.0%Tie
FrontierMath, tiers 1 to 390.2%93.7%GPT-6.1 Sol
FrontierMath, tier 487.8%100.0%GPT-6.1 Sol
ProofBench100.0%99.0%Claude Fable 5.1
LMArena Text: math15311489Claude Fable 5.1
LMArena Text: mathematical work15411513Claude 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 index51
Knowledge benchmarks for Claude Fable 5.1 and GPT-6.1 Sol
BenchmarkClaude Fable 5.1GPT-6.1 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%48.8%Claude Fable 5.1
SimpleQA Verified70.8%73.9%GPT-6.1 Sol
LMArena Text: science15321444Claude Fable 5.1
LMArena Text: medicine and healthcare15311433Claude Fable 5.1
LMArena Text: legal and government15141471Claude Fable 5.1
LMArena Text: business and finance14931445Claude 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 index34
Web design benchmarks for Claude Fable 5.1 and GPT-6.1 Sol
BenchmarkClaude Fable 5.1GPT-6.1 SolLeader
Design Arena: websites13131321GPT-6.1 Sol
Design Arena: UI components13381321Claude Fable 5.1
Design Arena: game dev13821389GPT-6.1 Sol
Design Arena: data viz13441278Claude Fable 5.1
Design Arena: 3D13931461GPT-6.1 Sol
Design Arena: all code categories13361345GPT-6.1 Sol
Design Arena: SVG1301Not measuredOnly Claude Fable 5.1 measured
Design Arena: ASCII art1324Not measuredOnly Claude Fable 5.1 measured
LiveBench design83.4%82.1%Claude Fable 5.1
GeneralLike-for-likePublic boards, shown as published, kept out of the index232
General benchmarks for Claude Fable 5.1 and GPT-6.1 Sol
BenchmarkClaude Fable 5.1GPT-6.1 SolLeader
Vals IndexNot measured63.9%Only GPT-6.1 Sol measured
LiveBench data analysis80.3%82.7%GPT-6.1 Sol
Public Benefits Bench (Vals AI)74.9%59.3%Claude Fable 5.1
SAGE (Vals AI)48.5%46.5%Claude Fable 5.1
MedScribe (Vals AI)91.3%86.5%Claude Fable 5.1
Long context reasoning (AA-LCR)85.3%84.0%Claude Fable 5.1
DTBench97.6%96.5%Claude Fable 5.1
LMCA65.5%62.8%Claude Fable 5.1
Furniture assembly70.0%80.0%GPT-6.1 Sol
LMArena Text15121443Claude Fable 5.1
LMArena Text: instruction following15181466Claude Fable 5.1
LMArena Text: creative writing15091425Claude Fable 5.1
LMArena Vision13191288Claude Fable 5.1
LMArena Text: English15061450Claude Fable 5.1
LMArena Text: non-English15081433Claude Fable 5.1
LMArena Text: Chinese15841487Claude Fable 5.1
LMArena Text: German1499Not measuredOnly Claude Fable 5.1 measured
LMArena Text: Japanese1562Not measuredOnly Claude Fable 5.1 measured
LMArena Text: Korean1517Not measuredOnly Claude Fable 5.1 measured
LMArena Text: French15231460Claude Fable 5.1
LMArena Text: Spanish15201439Claude Fable 5.1
LMArena Text: Russian15201457Claude Fable 5.1
LMArena Text: Polish1525Not measuredOnly Claude Fable 5.1 measured
LMArena Text: multi-turn14931442Claude Fable 5.1
LMArena Text: longer queries15241458Claude Fable 5.1
LMArena Text: writing and language15101444Claude Fable 5.1
LMArena Text: entertainment and media14971426Claude Fable 5.1
LMArena Vision: English13131274Claude Fable 5.1
LMArena Vision: Chinese1391Not measuredOnly Claude Fable 5.1 measured
LMArena Vision: reading text13271289Claude Fable 5.1
LMArena Vision: humor1318Not measuredOnly Claude Fable 5.1 measured
LMArena Vision: creative writing13301301Claude Fable 5.1
Neither model has a result on the other 14 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-6.1 Sol
BenchmarkClaude Fable 5.1GPT-6.1 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-6.1 Sol$0.0070Fits in one request

GPT-6.1 Sol costs less

Repository review

50K input + 3K output tokens

Claude Fable 5.1$0.650Fits in one request
GPT-6.1 Sol$0.130Fits in one request

GPT-6.1 Sol costs less

Agent loop

200K input + 10K output tokens

Claude Fable 5.1$2.50Fits in one request
GPT-6.1 Sol$0.500Fits in one request

GPT-6.1 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-6.1 Sol
SpecificationAnthropic Claude Fable 5.1OpenAI GPT-6.1 Sol
MakerAnthropicOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedSeptember 1, 2026September 29, 2026
Context window1M1.05M
Input $/Mtok$10.00$2.00
Output $/Mtok$50.00$10.00
Coding index89.188.7
Independent measurements behind it22
Cost per solved taskNot computableNot computable
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Fable 5.1 better than GPT-6.1 Sol for coding?

Claude Fable 5.1 and GPT-6.1 Sol are level for coding, 89.1 against 88.7 on the Vibe Coding Index, so price and context decide. Pick GPT-6.1 Sol when output tokens cost 5.0x less, or when the context window is larger, 1.05M against 1M tokens. Pick Claude Fable 5.1 when what matters is LiveBench coding or Terminal-Bench 4 (Vals AI), where it leads.

Which is cheaper, Claude Fable 5.1 or GPT-6.1 Sol?

Claude Fable 5.1 costs $10.00 per million input tokens and $50.00 per million output tokens; GPT-6.1 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-6.1 Sol?

GPT-6.1 Sol, with 1.05M tokens against 1M.

How many benchmarks is the Claude Fable 5.1 vs GPT-6.1 Sol comparison based on?

90 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-6.1 Sol's on 2. Where only one model has a result, the page says so instead of naming a winner.

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