Noometry

Model comparison

Claude Fable 5 vs Gemini 3 Flash Preview

Claude Fable 5 is the stronger model overall, scoring 66.3 to 52.3 on the Noometry Index. Gemini 3 Flash Preview costs 18× less per token, which makes it the better buy when Claude Fable 5's lead doesn't matter for your workload.

Last verified . 42 shared benchmarks.

Claude Fable 5 Anthropic

66.3

Rank #5 Confirmed

Gemini 3 Flash Preview Google

52.3

Rank #33 Confirmed

Summary

  • They share 42 benchmarks with published results for both. Claude Fable 5 scores higher in 10 categories and Gemini 3 Flash Preview in 0 categories; 9 gaps are clear of the uncertainty.
  • The widest gap is in math, where Claude Fable 5 leads 88.4 to 51.4.
  • The biggest single-benchmark swing is ProofBench: 95% for Claude Fable 5 and 15% for Gemini 3 Flash Preview.
  • Gemini 3 Flash Preview is cheaper at $0.50 / $3 per million input/output tokens, against $10 / $50 for Claude Fable 5.
  • Gemini 3 Flash Preview accepts more context: 1.05M tokens versus 1M.

Side by side

Claude Fable 5Gemini 3 Flash Preview
ProviderAnthropicGoogle
Noometry Index66.352.3
Released2026-06-072025-12-17
WeightsProprietaryProprietary
Context window1M1.05M
Max output128K66K
Input $ / M tokens$10$0.50
Output $ / M tokens$50$3
Results tracked6159

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Category by category

Coding Claude Fable 5 leads

Claude Fable 5: 67.0 (#4), Gemini 3 Flash Preview: 51.5 (#35)

BenchmarkClaude Fable 5Gemini 3 Flash Preview
LMArena WebDev16261439
WeirdML91.9%61.6%
LMArena Coding15191460
ALE-Bench2,0411,367
SWE-bench Verified—75.4%
DeepSWE69.9%—
FrontierCode53.5%—
SWE-bench Verified (bash only)—75.8%
SWE-bench Multilingual—72.7%
FrontierSWE47%—
SciCode61%—
GSO—9.8%
MirrorCode63.9%—

Agentic & Tool Use Claude Fable 5 leads

Claude Fable 5: 54.1 (#2), Gemini 3 Flash Preview: 38.6 (#27)

BenchmarkClaude Fable 5Gemini 3 Flash Preview
τ²-bench Banking39.7%27.3%
GDP.pdf30%10%
LMArena Search12301198
Vending-Bench 25,6803,635
Terminal-Bench—64.3%
APEX-Agents63.6%—
Remote Labor Index16.1%—
τ²-bench Airline—82.5%
τ²-bench Retail—76.8%
τ²-bench Telecom—91.2%
DeepResearch Bench—49.8%
PostTrainBench41.8%—
BALROG—48.1%
GBAEval74.5%—

Reasoning Claude Fable 5 leads

Claude Fable 5: 76.8 (#4), Gemini 3 Flash Preview: 49.2 (#35)

BenchmarkClaude Fable 5Gemini 3 Flash Preview
ARC-AGI-289.2%33.6%
SimpleBench81.9%61.1%
NYT Connections (extended)92.7%83.1%
ARC-AGI-198.5%84.7%
Chess Puzzles41%40%
LMArena Hard Prompts15081465
Mystery Game Puzzles52%26%
DTBench98.4%89.1%
LMCA61.1%43.1%
Epoch Capabilities Index163.6151.83
Kagi LLM Benchmark91.4%—
CritPt28.6%—
EnigmaEval39.3%—
EBR-Bench39.5%—
Surface Evolver Bench95%—
Bench to the Future 30.13—
ForecastBench—58.5

Math Claude Fable 5 leads

Claude Fable 5: 88.4 (#5), Gemini 3 Flash Preview: 51.4 (#42)

BenchmarkClaude Fable 5Gemini 3 Flash Preview
FrontierMath (Tiers 1-3)87%51.2%
FrontierMath Tier 490.2%17.1%
OTIS Mock AIME 2024-2025100%95.6%
ProofBench95%15%
LMArena Math15191472
MathArena Final-Answer Competitions—67.6%
FrontierMath (Feb 2025 set)—35.6%
FrontierMath Erdős0%—
FrontierMath Tier 4 (v1)—4.2%

Knowledge Claude Fable 5 leads

Claude Fable 5: 62.3 (#22), Gemini 3 Flash Preview: 58.8 (#30)

BenchmarkClaude Fable 5Gemini 3 Flash Preview
GPQA Diamond85.9%89.4%
SimpleQA Verified70.7%66.8%
LMArena Expert15341461
Vectara Hallucination Rate—13.5%

Multimodal Too close to call

Claude Fable 5: 45.6 (#14), Gemini 3 Flash Preview: 45.3 (#15)

BenchmarkClaude Fable 5Gemini 3 Flash Preview
LMArena Vision13261285
Blueprint-Bench 238.6%0%
LMArena Document14961413
GeoBench—88%
VPCT—72.6%
Furniture Assembly35.8%—

Multilingual Claude Fable 5 leads

Claude Fable 5: 57.6 (#8), Gemini 3 Flash Preview: 55.9 (#26)

BenchmarkClaude Fable 5Gemini 3 Flash Preview
LMArena Non-English14831458
LMArena Chinese15461510
LMArena French15091478
LMArena German14861497
LMArena Japanese15071488
LMArena Korean14931443
LMArena Russian15071480
LMArena Spanish15031470

Instruction Following Claude Fable 5 leads

Claude Fable 5: 78.8 (#7), Gemini 3 Flash Preview: 75.8 (#52)

BenchmarkClaude Fable 5Gemini 3 Flash Preview
LMArena Instruction Following15031437

Long Context Claude Fable 5 leads

Claude Fable 5: 46.3 (#22), Gemini 3 Flash Preview: 44.4 (#63)

BenchmarkClaude Fable 5Gemini 3 Flash Preview
LMArena Longer Query15101452

Writing & Preference Claude Fable 5 leads

Claude Fable 5: 76.1 (#5), Gemini 3 Flash Preview: 65.6 (#44)

BenchmarkClaude Fable 5Gemini 3 Flash Preview
LMArena Text14911466
LMArena Creative Writing14941457
LMArena Multi-Turn15051471
EQ-Bench Creative Writing1943—
EQ-Bench 41340—

Frequently asked questions

Is Claude Fable 5 better than Gemini 3 Flash Preview?

Claude Fable 5 is the stronger model overall, scoring 66.3 to 52.3 on the Noometry Index. Gemini 3 Flash Preview costs 18× less per token, which makes it the better buy when Claude Fable 5's lead doesn't matter for your workload.

Which is cheaper, Claude Fable 5 or Gemini 3 Flash Preview?

Gemini 3 Flash Preview is cheaper. It lists at $0.50 per million input tokens and $3 per million output tokens; Claude Fable 5 lists at $10 and $50.

Is Claude Fable 5 or Gemini 3 Flash Preview better for coding?

Claude Fable 5 scores higher on coding benchmarks: 67.0 versus 51.5 in the Noometry coding category.

Which has the bigger context window?

Gemini 3 Flash Preview does, with 1.05M tokens against 1M.

How many benchmarks do Claude Fable 5 and Gemini 3 Flash Preview share?

42 benchmarks have published results for both models. Claude Fable 5 has 61 scored results on Noometry and Gemini 3 Flash Preview has 59.

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