Compare · AI models
Claude Fable 5.1 vs GPT-5.5 Pro
RANKED BY EPOCH CAPABILITIES INDEX (ECI)
#2 VS #5
CHECKED 28 SEPT 2026
Side by side
Verdict
Claude Fable 5.1 ranks #2 of 20 on Epoch Capabilities Index (ECI) (165.00); GPT-5.5 Pro ranks #5 (162.45).
Rank 02 of 20 · leads
Epoch Capabilities Index (ECI)
165.00
MakerAnthropic
Date2026
Verified—
Evidence
Epoch AI epoch_capabilities_index/eci_scores.csv (LLM Benchmark Data ZIP, fetched 2026-09-28). ECI 165, accessibility API access, release date 2026-09-01. Not matched in Statlyte’s dataset this run.Rank 05 of 20
Epoch Capabilities Index (ECI)
162.45
MakerOpenAI
Date2026
Verified—
Evidence
Epoch AI epoch_capabilities_index/eci_scores.csv (LLM Benchmark Data ZIP, fetched 2026-09-28). ECI 162.45, accessibility API access, release date 2026-04-23. Pricing/context via Statlyte (statlyte.com/models/openai/gpt-5-5-pro), MIT licensed.Try another pair
More Claude Fable 5.1 matchups
- Claude Fable 5.1 vs GPT-6 Astra
- Claude Fable 5.1 vs Claude Fable 5
- Claude Fable 5.1 vs Claude Opus 5
- Claude Fable 5.1 vs GPT-5.6 Sol
- Claude Fable 5.1 vs GPT-5.6 Terra
- Claude Fable 5.1 vs GPT-5.5
- Claude Fable 5.1 vs GPT-5.4 Pro
- Claude Fable 5.1 vs Claude Opus 4.8
- Claude Fable 5.1 vs Gemini 3.7 Flash
- Claude Fable 5.1 vs Kimi K3
- Claude Fable 5.1 vs Gemini 3.8 Flash
- Claude Fable 5.1 vs GPT-5.4
Source Ranking: Epoch AI, AI Benchmarking Hub, Epoch Capabilities Index (epoch.ai/data/benchmark_data.zip, CC BY 4.0). Per-entry pricing/context:…
Last checked 28 Sept 2026