LLM Comparison

Claude Fable 5.1 vs Claude Opus 4.8: benchmark scores, pricing & comparison.

Side-by-side Claude Fable 5.1 vs Claude Opus 4.8 comparison across SWE-bench, GPQA, HLE, Terminal-Bench, coding agent scores, token pricing, context window, and AskClash RWT. Green marks the winner on each benchmark.

Open live leaderboardClaude Fable 5.1 model pageClaude Opus 4.8 model page
Rank #1 vs #10AskClash overall scores 92.0 vs 69.4.
Pricing $10.0/$50.0 vs $5.00/$25.0Input and output token prices per 1M tokens when published.
Proprietary vs ProprietaryAnthropic vs Anthropic.

Claude Fable 5.1 vs Claude Opus 4.8 benchmark comparison

Green cells highlight the winning model for each metric. Scores are cached from the AskClash LLM leaderboard snapshot.

MetricClaude Fable 5.1Claude Opus 4.8
Overall Score92.069.4
Leaderboard Rank#1#10
ACB79.260.1
RWT9.09.0
Coding Agent Index—72.5
HLE65.057.9
GPQA93.793.6
IFEval—62.2
SWE-bench—88.6
SWE-Pro81.269.2
SWE-Atlas—82.5
Terminal-Bench91.474.6
DeepSWE67.459.0
GDPval-AA1853.01889.8
OSWorld—83.4
MCP Atlas—82.2
Finance Agent58.953.9
CharXiv—89.9
MMMU-Pro90.6—
ARC-AGI 290.072.1
Tau2—94.4
Input Price (per 1M tokens)$10.0$5.00
Output Price (per 1M tokens)$50.0$25.0
Context Window1M1M
Benchmarks Published1118

Claude Fable 5.1 vs Claude Opus 4.8 head-to-head charts

Claude Fable 5.1 leads 9 and Claude Opus 4.8 leads 1 of 11 shared benchmarks. Claude Opus 4.8 is cheaper on a defined 1M-input / 200K-output workload. Charts show only benchmarks both models publish.

Claude Fable 5.1Claude Opus 4.8
Overall
92.0Claude Fable 5.1
69.4Claude Opus 4.8
ACB
79.2Claude Fable 5.1
60.1Claude Opus 4.8
RWT
9.0Claude Fable 5.1
9.0Claude Opus 4.8
HLE
65.0Claude Fable 5.1
57.9Claude Opus 4.8
GPQA
93.7Claude Fable 5.1
93.6Claude Opus 4.8
SWE-Pro
81.2Claude Fable 5.1
69.2Claude Opus 4.8
Terminal-Bench
91.4Claude Fable 5.1
74.6Claude Opus 4.8
DeepSWE
67.4Claude Fable 5.1
59.0Claude Opus 4.8
GDPval-AA
1853.0Claude Fable 5.1
1889.8Claude Opus 4.8
Finance Agent
58.9Claude Fable 5.1
53.9Claude Opus 4.8
ARC-AGI 2
90.0Claude Fable 5.1
72.1Claude Opus 4.8
Claude Fable 5.1
Input$10.0
Output$50.0
Workload$20
Context1M
Claude Opus 4.8
Input$5.00
Output$25.0
Workload$10
Context1M

Workload = published cost of 1M input + 200K output tokens. Open the live leaderboard for interactive compare charts.

More Claude Fable 5.1 and Claude Opus 4.8 comparisons

Explore how Claude Fable 5.1 and Claude Opus 4.8 stack up against other top-ranked LLMs.

Claude Fable 5.1 vs Claude Opus 5Claude Opus 5 vs Claude Opus 4.8Claude Fable 5.1 vs Claude Fable 5Claude Fable 5 vs Claude Opus 4.8Claude Fable 5.1 vs GLM-5.3GLM-5.3 vs Claude Opus 4.8Claude Fable 5.1 vs Grok 4.6Grok 4.6 vs Claude Opus 4.8Claude Fable 5.1 vs GPT-5.6 SolGPT-5.6 Sol vs Claude Opus 4.8

How to read this comparison

Benchmark scores

Higher is better for all benchmark scores (SWE-bench, GPQA, HLE, Terminal-Bench, etc.). Green marks the model with the higher score.

Token pricing

Lower is better for input and output prices. Green marks the cheaper model per 1M tokens.

Coverage matters

Models with fewer disclosed benchmark cells may have inflated percentile scores. Check the benchmark cell count for context.

This comparison page is generated from the AskClash LLM leaderboard cache. Open the live leaderboard for real-time scores and interactive filtering.