Claude Opus 5.5 vs Claude Fable 5.2
How does Claude Opus 5.5 (Anthropic) compare against Claude Fable 5.2 (Anthropic)? Side-by-side scores, capability ratings and pricing, plus a clear verdict.
🏆 Quick verdict
Claude Fable 5.2 comes out ahead with an AIVerso score of 99 vs 98 and an aggregate capability rating of 662 vs 667 across 7 categories. Claude Opus 5.5 still leads on Programming, Reasoning, Knowledge and Agent Capability. Claude Opus 5.5 wins on price — lower API price ($4/$20 per 1M vs $8/$40 per 1M tokens).
Claude Opus 5.5
by Anthropic
Score: 98/100
PriceFrom $20/mo (Pro)
Pricing details$4/$20 per 1M
Context window1M
Free tierNo
API accessYes
Open sourceNo
BenchmarksAA Intelligence Index v5: 59
Headline factsAA Intelligence Index 59 · SWE-bench Pro 89.9% · OSWorld 2.1 81.8% · $4/$20 per 1M · 1M context
🔗 Try Claude Opus 5.5 →
Full Claude Opus 5.5 profile → Overall winner
Claude Fable 5.2
by Anthropic
Score: 99/100
Price$8/$40 per 1M tokens
Pricing detailsAPI $8/$40 per 1M tokens (cache reads $0.20) · Fast mode $16/$80 per 1M · Claude Pro $20/mo (Fable up to 50% of weekly usage) · Max, Team & Enterprise plans
Context window1M
Free tierNo
API accessYes
Open sourceNo
BenchmarksAA Intelligence Index v5: 65
Headline facts#1 on the AA Intelligence Index 65 · Anthropic’s new top model (Nov 9) · FrontierSWE v2 69.9% · Terminal-Bench-Science 74.6% · up to 30% faster than Fable 5.1 · $8/$40 per 1M
🔗 Try Claude Fable 5.2 →
Full Claude Fable 5.2 profile →🔗 Affiliate link — we may earn a commission if you sign up, at no extra cost to you.
📊 Capability ratings
AIVerso capability ratings (0–100) per category — an editorial summary informed by public benchmark results. Higher is better.
Category
Claude Opus 5.5
Claude Fable 5.2
Math & Logice.g. AIME, MATH-500
96
96
Programminge.g. SWE-bench, LiveCodeBench
96
95
Reasoninge.g. GPQA, ARC
96
94
Knowledgee.g. MMLU-Pro
92
91
Long Contexte.g. MRCR, needle tests
95
96
Instruction Followinge.g. IFEval
95
95
Agent Capabilitye.g. Terminal-Bench, tool use
97
95
Why Claude Opus 5.5
Lower API price ($4/$20 per 1M vs $8/$40 per 1M tokens)
Leads on Programming (96 vs 95)
Leads on Reasoning (96 vs 94)
Leads on Knowledge (92 vs 91)
Leads on Agent Capability (97 vs 95)
AA Intelligence Index 59
SWE-bench Pro 89.9%
Why Claude Fable 5.2
Higher overall score (99 vs 98)
Leads on Long Context (96 vs 95)
#1 on the AA Intelligence Index 65
Anthropic’s new top model (Nov 9)
Open this comparison in the live tool →
❓ Frequently Asked Questions
Which is better: Claude Opus 5.5 or Claude Fable 5.2?
Claude Fable 5.2 has the higher AIVerso score (99 vs 98). The better choice still depends on your use case — Claude Opus 5.5 leads on Programming and Reasoning.
How much does Claude Opus 5.5 cost compared to Claude Fable 5.2?
Claude Opus 5.5: From $20/mo (Pro) ($4/$20 per 1M). Claude Fable 5.2: $8/$40 per 1M tokens (API $8/$40 per 1M tokens (cache reads $0.20) · Fast mode $16/$80 per 1M · Claude Pro $20/mo (Fable up to 50% of weekly usage) · Max, Team & Enterprise plans). Neither has a free tier.
What context window does each support?
Claude Opus 5.5: 1M tokens. Claude Fable 5.2: 1M tokens. The context window determines how much text, code or chat history a model can process at once.
Are Claude Opus 5.5 and Claude Fable 5.2 open source?
Claude Opus 5.5 is a closed, proprietary model. Claude Fable 5.2 is a closed, proprietary model.
How we compare: Scores and capability ratings are based on public benchmarks and provider documentation — not on commission rates. Last updated: November 11, 2026.