Noometry

Model comparison

Claude Fable 5 vs GPT-5 Mini

Claude Fable 5 is the stronger model overall, scoring 66.8 to 41.8 on the Noometry Index. GPT-5 Mini costs 29× less per token, which makes it the better buy when Claude Fable 5's lead doesn't matter for your workload.

Last verified . 39 shared benchmarks.

Claude Fable 5 Anthropic

66.8

Rank #5 Confirmed

GPT-5 Mini OpenAI

41.8

Rank #128 Confirmed

Summary

  • They share 39 benchmarks with published results for both. Claude Fable 5 scores higher in 10 categories and GPT-5 Mini in 0 categories; 10 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Claude Fable 5 leads 76.8 to 23.9.
  • The biggest single-benchmark swing is ProofBench: 95% for Claude Fable 5 and 9% for GPT-5 Mini.
  • GPT-5 Mini is cheaper at $0.25 / $2 per million input/output tokens, against $10 / $50 for Claude Fable 5.
  • Claude Fable 5 accepts more context: 1M tokens versus 400K.

Side by side

Claude Fable 5GPT-5 Mini
ProviderAnthropicOpenAI
Noometry Index66.841.8
Released2026-06-072025-08-07
WeightsProprietaryProprietary
Context window1M400K
Max output128K128K
Input $ / M tokens$10$0.25
Output $ / M tokens$50$2
Results tracked6260

Sponsored placements are available on pages like this one. Advertise on Noometry

Category by category

Coding Claude Fable 5 leads

Claude Fable 5: 70.6 (#4), GPT-5 Mini: 40.1 (#146)

BenchmarkClaude Fable 5GPT-5 Mini
SciCode61%39.2%
WeirdML91.9%52.7%
LMArena Coding15191406
ALE-Bench2,041799.77
SWE-bench Verified—64.7%
DeepSWE69.9%—
FrontierCode53.5%—
SWE-bench Verified (bash only)—59.8%
LMArena WebDev1625—
SWE-bench Multilingual—39.7%
FrontierSWE47%—
GSO78.4%—
MirrorCode63.9%—
AlgoTune—1.38

Agentic & Tool Use Claude Fable 5 leads

Claude Fable 5: 54.0 (#2), GPT-5 Mini: 31.1 (#70)

BenchmarkClaude Fable 5GPT-5 Mini
Vending-Bench 25,680-31.18
Terminal-Bench—34.8%
APEX-Agents63.6%—
Berkeley Function Calling Leaderboard—55.5%
Remote Labor Index16.1%—
τ²-bench Banking39.7%—
PostTrainBench41.8%—
GBAEval74.5%—
GDP.pdf30%—
LMArena Search1230—

Reasoning Claude Fable 5 leads

Claude Fable 5: 76.8 (#6), GPT-5 Mini: 23.9 (#168)

BenchmarkClaude Fable 5GPT-5 Mini
ARC-AGI-289.2%4.4%
Kagi LLM Benchmark91.4%70.3%
ARC-AGI-198.5%54.3%
CritPt28.6%0%
Chess Puzzles41%30%
EnigmaEval39.3%8.2%
LMArena Hard Prompts15081380
Mystery Game Puzzles52%10%
DTBench98.4%80.5%
LMCA61.1%34.2%
Epoch Capabilities Index162.06145.52
SimpleBench81.9%—
NYT Connections (extended)92.7%—
EBR-Bench39.5%—
Surface Evolver Bench95%—
Bench to the Future 30.13—
ForecastBench—61

Math Claude Fable 5 leads

Claude Fable 5: 88.5 (#5), GPT-5 Mini: 46.7 (#69)

BenchmarkClaude Fable 5GPT-5 Mini
FrontierMath (Tiers 1-3)87%46.7%
FrontierMath Tier 490.2%12.2%
OTIS Mock AIME 2024-2025100%86.7%
ProofBench95%9%
LMArena Math15191378
Omni-MATH—72.2%
MATH Level 5—97.8%
FrontierMath (Feb 2025 set)—27.2%
FrontierMath Erdős0%—
FrontierMath Tier 4 (v1)—6.3%

Knowledge Claude Fable 5 leads

Claude Fable 5: 62.2 (#25), GPT-5 Mini: 45.6 (#86)

BenchmarkClaude Fable 5GPT-5 Mini
GPQA Diamond85.9%75%
SimpleQA Verified70.7%21.6%
LMArena Expert15341379
Humanity's Last Exam—19.4%
MMLU-Pro—83.5%
Confabulations—13.3%
Vectara Hallucination Rate—12.9%
GPQA (HELM)—75.6%

Multimodal Claude Fable 5 leads

Claude Fable 5: 45.3 (#17), GPT-5 Mini: 35.6 (#85)

BenchmarkClaude Fable 5GPT-5 Mini
LMArena Vision13241202
VPCT—40.2%
Blueprint-Bench 238.6%—
Furniture Assembly35.8%—
LMArena Document1496—

Multilingual Claude Fable 5 leads

Claude Fable 5: 57.3 (#9), GPT-5 Mini: 48.9 (#137)

BenchmarkClaude Fable 5GPT-5 Mini
LMArena Non-English14811363
LMArena Chinese15431385
LMArena French15051386
LMArena German14861366
LMArena Japanese15061341
LMArena Korean14881308
LMArena Russian15041362
LMArena Spanish14981355

Instruction Following Claude Fable 5 leads

Claude Fable 5: 78.6 (#8), GPT-5 Mini: 76.2 (#46)

BenchmarkClaude Fable 5GPT-5 Mini
LMArena Instruction Following15021357
IFEval—92.7%

Long Context Claude Fable 5 leads

Claude Fable 5: 46.3 (#23), GPT-5 Mini: 41.9 (#132)

BenchmarkClaude Fable 5GPT-5 Mini
LMArena Longer Query15091355
Fiction.LiveBench—69.4%

Writing & Preference Claude Fable 5 leads

Claude Fable 5: 75.9 (#5), GPT-5 Mini: 55.2 (#148)

BenchmarkClaude Fable 5GPT-5 Mini
LMArena Text14911373
LMArena Creative Writing14941325
EQ-Bench Creative Writing19431313
LMArena Multi-Turn15041363
Short-Story Creative Writing—83.1%
WildBench—85.5%
EQ-Bench 41340—

Frequently asked questions

Is Claude Fable 5 better than GPT-5 Mini?

Claude Fable 5 is the stronger model overall, scoring 66.8 to 41.8 on the Noometry Index. GPT-5 Mini costs 29× 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 GPT-5 Mini?

GPT-5 Mini is cheaper. It lists at $0.25 per million input tokens and $2 per million output tokens; Claude Fable 5 lists at $10 and $50.

Is Claude Fable 5 or GPT-5 Mini better for coding?

Claude Fable 5 scores higher on coding benchmarks: 70.6 versus 40.1 in the Noometry coding category.

Which has the bigger context window?

Claude Fable 5 does, with 1M tokens against 400K.

How many benchmarks do Claude Fable 5 and GPT-5 Mini share?

39 benchmarks have published results for both models. Claude Fable 5 has 62 scored results on Noometry and GPT-5 Mini has 60.

Related comparisons

Go deeper