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Claude Fable 5.1 vs Gemini 3.1 Pro Preview

Claude Fable 5.1 leads Gemini 3.1 Pro Preview on coding, 84.2 to 32.3 on the Vibe Coding Index, and Gemini 3.1 Pro Preview costs 4.2x less per output token ($12.00 vs $50.00 per million). Updated October 22, 2026; 104 benchmarks have a result for both.

Replace Claude Fable 5.1 Replace Gemini 3.1 Pro Preview
Claude Fable 5.1Anthropic
Coding
84.2
Overall
84.7
Output $/M
$50.00
96
Gemini 3.1 Pro PreviewGoogle
Coding
32.3
Overall
54.0
Output $/M
$12.00
8
vs boards won of 104 shared

Claude Fable 5.1 or Gemini 3.1 Pro Preview: which to pick

Pick Claude Fable 5.1 for coding: it scores 84.2 on the Vibe Coding Index against 32.3 for Gemini 3.1 Pro Preview.

Pick Gemini 3.1 Pro Preview for output tokens 4.2x cheaper ($12.00 vs $50.00 per million) and a larger context window (1.05M against 1M tokens).

Model AClaude Fable 5.1Anthropic84.2/1005 independent benchmarksNo cost per solved taskModel BGemini 3.1 Pro PreviewGoogle32.3/1004 independent benchmarks$0.99 per solved task
Shared results
104
Claude Fable 5.1 only
20
Gemini 3.1 Pro Preview only
29
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, Gemini 3.1 Pro Preview 32.3 from 4 benchmarks.
Widest category
Math, 31.3 points apart on average over 6 shared benchmarks.
Widest single gap
Terminal-Bench 4 (Vals AI): Claude Fable 5.1 58.1% against Gemini 3.1 Pro Preview 2.5%, 74.1 points apart on a 0 to 100 scale.
Output price
Claude Fable 5.1 $50.00 against Gemini 3.1 Pro Preview $12.00 per million output tokens, 4.2x apart.
Context window
Claude Fable 5.1 takes 1M tokens, Gemini 3.1 Pro Preview 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 5.1BarsGemini 3.1 Pro PreviewTies
Coding200
Intelligence10
Agentic work140
Reasoning114
Math60
Knowledge82
Web design80
General282
All shared boards968
CodingLike-for-likeSix of these boards feed the Vibe Coding Index200
Coding benchmarks for Claude Fable 5.1 and Gemini 3.1 Pro Preview
BenchmarkClaude Fable 5.1Gemini 3.1 Pro PreviewLeader
LiveBench coding97.7%Not measuredOnly Claude Fable 5.1 measured
LMArena WebDev17431447Claude Fable 5.1
AA Coding Index81.668.8Claude Fable 5.1
LiveCodeBench (Vals AI)90.5%88.5%Claude Fable 5.1
SWE-bench Verified (Vals AI)Not measured78.8%Only Gemini 3.1 Pro Preview measured
Terminal-Bench 4 (Vals AI)58.1%2.5%Claude Fable 5.1
Vibe Code Bench (Vals AI)90.3%32.0%Claude Fable 5.1
Code migration (Vals AI)54.6%17.3%Claude Fable 5.1
ProgramBench (Vals AI)7.0%0.0%Claude Fable 5.1
IOI (Vals AI)90.8%51.8%Claude Fable 5.1
Terminal-Bench 2.1 (Vals AI)85.0%70.8%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%6.7%Claude Fable 5.1
SkillsBench (Vals AI)61.5%Not measuredOnly Claude Fable 5.1 measured
CyberBench (Vals AI)70.4%Not measuredOnly Claude Fable 5.1 measured
SciCode63.1%58.7%Claude Fable 5.1
Terminal-Bench Hard (Artificial Analysis run)Not measured53.8%Only Gemini 3.1 Pro Preview measured
Terminal-BenchNot measured80.2%Only Gemini 3.1 Pro Preview measured
FrontierCode50.9%Not measuredOnly Claude Fable 5.1 measured
FrontierSWE56.3%Not measuredOnly Claude Fable 5.1 measured
GSO-Bench88.2%22.6%Claude Fable 5.1
WeirdML92.9%72.1%Claude Fable 5.1
MirrorCode73.3%8.9%Claude Fable 5.1
ALE-Bench2143.21160.6Claude Fable 5.1
LMArena Text: coding15321484Claude Fable 5.1
LMArena Text: software and IT15301487Claude Fable 5.1
LMArena WebDev: React17921438Claude Fable 5.1
LMArena WebDev: HTML16841490Claude Fable 5.1
LMArena WebDev: from an image17221481Claude Fable 5.1
SciCodeNot measured14.3%Only Gemini 3.1 Pro Preview measured
Neither model has a result on the other 9 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index10
Intelligence benchmarks for Claude Fable 5.1 and Gemini 3.1 Pro Preview
BenchmarkClaude Fable 5.1Gemini 3.1 Pro PreviewLeader
AA Intelligence Index53.429.7Claude Fable 5.1
Epoch Capabilities Index166.5Not measuredOnly Claude Fable 5.1 measured
Agentic workLike-for-likePublic boards, shown as published, kept out of the index140
Agentic work benchmarks for Claude Fable 5.1 and Gemini 3.1 Pro Preview
BenchmarkClaude Fable 5.1Gemini 3.1 Pro PreviewLeader
AA Agentic Index57.98.2Claude Fable 5.1
Design Arena: agents building web apps13181125Claude Fable 5.1
Design Arena: agents building full-stack apps13261068Claude Fable 5.1
Design Arena: agents building mobile apps12671094Claude Fable 5.1
Design Arena: agents building Android appsNot measured1049Only Gemini 3.1 Pro Preview measured
Design Arena: agents building Godot games13271236Claude Fable 5.1
Design Arena: agents building gamesNot measured1113Only Gemini 3.1 Pro Preview measured
Design Arena: HTML slidesNot measured1103Only Gemini 3.1 Pro Preview measured
Design Arena: PowerPoint slides13051041Claude Fable 5.1
Design Arena: spreadsheets1380Not measuredOnly Claude Fable 5.1 measured
LiveBench research82.0%Not measuredOnly Claude Fable 5.1 measured
LiveBench browser100.0%Not measuredOnly Claude Fable 5.1 measured
LiveBench long agentic80.8%Not measuredOnly Claude Fable 5.1 measured
SREBench (Vals AI)22.9%0.0%Claude Fable 5.1
Finance Agent (Vals AI)58.9%43.0%Claude Fable 5.1
Tax Agent Bench (Vals AI)49.2%9.3%Claude Fable 5.1
Legal Research Bench (Vals AI)55.3%20.7%Claude Fable 5.1
Excel Modeling Benchmark (Vals AI)76.7%52.6%Claude Fable 5.1
BioMysteryBench (Vals AI)Not measured60.0%Only Gemini 3.1 Pro Preview measured
Terminal-Bench-Science (Vals AI)40.0%1.4%Claude Fable 5.1
Vals Science IndexNot measured27.4%Only Gemini 3.1 Pro Preview 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
τ²-Bench TelecomNot measured95.6%Only Gemini 3.1 Pro Preview measured
APEX-Agents68.6%35.1%Claude Fable 5.1
METR time horizonsNot measured77.0%Only Gemini 3.1 Pro Preview measured
Remote Labor Index17.9%Not measuredOnly Claude Fable 5.1 measured
BALROGNot measured57.0%Only Gemini 3.1 Pro Preview measured
DeepResearch BenchNot measured47.8%Only Gemini 3.1 Pro Preview measured
PostTrainBenchNot measured22.0%Only Gemini 3.1 Pro Preview measured
SpireClimb2.0%Not measuredOnly Claude Fable 5.1 measured
Vending-Bench 2$5,422$911Claude Fable 5.1
LMArena Search1246Not measuredOnly Claude Fable 5.1 measured
Neither model has a result on the other 7 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index114
Reasoning benchmarks for Claude Fable 5.1 and Gemini 3.1 Pro Preview
BenchmarkClaude Fable 5.1Gemini 3.1 Pro PreviewLeader
GPQA Diamond93.4%95.5%Gemini 3.1 Pro Preview
LiveBench reasoning91.7%Not measuredOnly Claude Fable 5.1 measured
MysteryMechanism (Vals AI)47.8%20.7%Claude Fable 5.1
MMMU Pro (Vals AI)90.6%88.2%Claude Fable 5.1
GPQA Diamond (Artificial Analysis run)93.7%94.1%Gemini 3.1 Pro Preview
Humanity's Last Exam (Artificial Analysis run)59.1%47.0%Claude Fable 5.1
GPQA Diamond (Epoch AI run)Not measured94.4%Only Gemini 3.1 Pro Preview measured
ARC-AGI97.5%98.0%Gemini 3.1 Pro Preview
ARC-AGI-290.0%77.1%Claude Fable 5.1
SimpleBenchNot measured79.6%Only Gemini 3.1 Pro Preview measured
Chess puzzles48.0%51.0%Gemini 3.1 Pro Preview
Mystery game puzzles58.0%34.0%Claude Fable 5.1
EBR-bench57.1%14.3%Claude Fable 5.1
LMArena Text: hard prompts15281485Claude Fable 5.1
LMArena Text: expert15441483Claude Fable 5.1
LMArena Text: hard prompts in English15221480Claude Fable 5.1
LMArena Vision: diagrams13431311Claude Fable 5.1
LMArena Vision: homework13451316Claude 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 index60
Math benchmarks for Claude Fable 5.1 and Gemini 3.1 Pro Preview
BenchmarkClaude Fable 5.1Gemini 3.1 Pro PreviewLeader
AIMENot measured98.1%Only Gemini 3.1 Pro Preview measured
OTIS Mock AIME100.0%95.6%Claude Fable 5.1
FrontierMath, tiers 1 to 390.2%59.6%Claude Fable 5.1
FrontierMath, tier 487.8%26.8%Claude Fable 5.1
ProofBench100.0%26.0%Claude Fable 5.1
LMArena Text: math15311486Claude Fable 5.1
LMArena Text: mathematical work15411478Claude Fable 5.1
Neither model has a result on the other 6 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index82
Knowledge benchmarks for Claude Fable 5.1 and Gemini 3.1 Pro Preview
BenchmarkClaude Fable 5.1Gemini 3.1 Pro PreviewLeader
MMLU Pro92.4%91.0%Claude Fable 5.1
LegalBench (Vals AI)88.5%87.4%Claude Fable 5.1
CaseLaw (Vals AI)Not measured64.8%Only Gemini 3.1 Pro Preview measured
CorpFin (Vals AI)Not measured64.5%Only Gemini 3.1 Pro Preview measured
TaxEval (Vals AI)76.0%72.9%Claude Fable 5.1
MortgageTax (Vals AI)70.8%69.4%Claude Fable 5.1
MedQA (Vals AI)Not measured96.4%Only Gemini 3.1 Pro Preview measured
MedCode (Vals AI)53.5%59.1%Gemini 3.1 Pro Preview
SimpleQA Verified70.8%73.5%Gemini 3.1 Pro Preview
LMArena Text: science15321497Claude Fable 5.1
LMArena Text: medicine and healthcare15311486Claude Fable 5.1
LMArena Text: legal and government15141487Claude Fable 5.1
LMArena Text: business and finance14931459Claude Fable 5.1
FACTS Benchmark SuiteNot measured67.4%Only Gemini 3.1 Pro Preview measured
Neither model has a result on the other 4 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index80
Web design benchmarks for Claude Fable 5.1 and Gemini 3.1 Pro Preview
BenchmarkClaude Fable 5.1Gemini 3.1 Pro PreviewLeader
Design Arena: websites13121233Claude Fable 5.1
Design Arena: UI components13361224Claude Fable 5.1
Design Arena: game dev13811202Claude Fable 5.1
Design Arena: data viz13441209Claude Fable 5.1
Design Arena: 3D13921234Claude Fable 5.1
Design Arena: all code categories13351231Claude Fable 5.1
Design Arena: SVG13001285Claude Fable 5.1
Design Arena: ASCII art13231270Claude Fable 5.1
LiveBench design83.4%Not measuredOnly Claude Fable 5.1 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index282
General benchmarks for Claude Fable 5.1 and Gemini 3.1 Pro Preview
BenchmarkClaude Fable 5.1Gemini 3.1 Pro PreviewLeader
LiveBench data analysis80.3%Not measuredOnly Claude Fable 5.1 measured
Public Benefits Bench (Vals AI)74.9%53.8%Claude Fable 5.1
SAGE (Vals AI)48.5%48.7%Gemini 3.1 Pro Preview
MedScribe (Vals AI)91.3%76.1%Claude Fable 5.1
Vals Multimodal IndexNot measured56.1%Only Gemini 3.1 Pro Preview measured
IFBenchNot measured77.1%Only Gemini 3.1 Pro Preview measured
Long context reasoning (AA-LCR)85.3%82.0%Claude Fable 5.1
DTBench97.6%97.1%Claude Fable 5.1
LMCA65.5%53.8%Claude Fable 5.1
CL-benchNot measured20.8%Only Gemini 3.1 Pro Preview measured
Furniture assembly70.0%26.7%Claude Fable 5.1
ExploitBenchNot measured26.1%Only Gemini 3.1 Pro Preview measured
CL-bench LifeNot measured16.9%Only Gemini 3.1 Pro Preview measured
LMArena Text15121480Claude Fable 5.1
LMArena Text: instruction following15181466Claude Fable 5.1
LMArena Text: creative writing15091482Claude Fable 5.1
LMArena Vision13191296Claude Fable 5.1
LMArena Text: English15061478Claude Fable 5.1
LMArena Text: non-English15081476Claude Fable 5.1
LMArena Text: Chinese15841527Claude Fable 5.1
LMArena Text: German14991490Claude Fable 5.1
LMArena Text: Japanese15621491Claude Fable 5.1
LMArena Text: Korean15171455Claude Fable 5.1
LMArena Text: French15231487Claude Fable 5.1
LMArena Text: Spanish15201481Claude Fable 5.1
LMArena Text: Russian15201497Claude Fable 5.1
LMArena Text: Polish15251498Claude Fable 5.1
LMArena Text: multi-turn14931487Claude Fable 5.1
LMArena Text: longer queries15241482Claude Fable 5.1
LMArena Text: writing and language15101481Claude Fable 5.1
LMArena Text: entertainment and media14971465Claude Fable 5.1
LMArena Vision: English13131287Claude Fable 5.1
LMArena Vision: Chinese13911364Claude Fable 5.1
LMArena Vision: reading text13271304Claude Fable 5.1
LMArena Vision: humor13181322Gemini 3.1 Pro Preview
LMArena Vision: captioningNot measured1345Only Gemini 3.1 Pro Preview measured
LMArena Vision: recognizing thingsNot measured1330Only Gemini 3.1 Pro Preview measured
LMArena Vision: creative writing13301324Claude Fable 5.1
LMArena DocumentNot measured1444Only Gemini 3.1 Pro Preview measured
Neither model has a result on the other 7 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 Gemini 3.1 Pro Preview
BenchmarkClaude Fable 5.1Gemini 3.1 Pro PreviewLeader
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
Gemini 3.1 Pro Preview$0.0080Fits in one request

Gemini 3.1 Pro Preview costs less

Repository review

50K input + 3K output tokens

Claude Fable 5.1$0.650Fits in one request
Gemini 3.1 Pro Preview$0.136Fits in one request

Gemini 3.1 Pro Preview costs less

Agent loop

200K input + 10K output tokens

Claude Fable 5.1$2.50Fits in one request
Gemini 3.1 Pro Preview$0.520Fits in one request

Gemini 3.1 Pro Preview 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 Gemini 3.1 Pro Preview
SpecificationAnthropic Claude Fable 5.1Google Gemini 3.1 Pro Preview
MakerAnthropicGoogle
WeightsNo public weights listedNo public weights listed
ReleasedSeptember 1, 2026February 19, 2026
Context window1M1.05M
Input $/Mtok$10.00$2.00
Output $/Mtok$50.00$12.00
Coding index84.232.3
Independent measurements behind it54
Cost per solved taskNot computable$0.99
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Fable 5.1 better than Gemini 3.1 Pro Preview for coding?

Pick Claude Fable 5.1 for coding: it scores 84.2 on the Vibe Coding Index against 32.3 for Gemini 3.1 Pro Preview. Pick Gemini 3.1 Pro Preview for output tokens 4.2x cheaper ($12.00 vs $50.00 per million) and a larger context window (1.05M against 1M tokens).

Which is cheaper, Claude Fable 5.1 or Gemini 3.1 Pro Preview?

Claude Fable 5.1 costs $10.00 per million input tokens and $50.00 per million output tokens; Gemini 3.1 Pro Preview costs $2.00 and $12.00. Cost per solved task is known for Gemini 3.1 Pro Preview only.

Which has the bigger context window, Claude Fable 5.1 or Gemini 3.1 Pro Preview?

Gemini 3.1 Pro Preview, with 1.05M tokens against 1M.

How many benchmarks is the Claude Fable 5.1 vs Gemini 3.1 Pro Preview comparison based on?

104 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 Gemini 3.1 Pro Preview's on 4. Where only one model has a result, the page says so instead of naming a winner.

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