Compare AI Models: SI Score, Benchmarks, and Price Head to Head
Head-to-head pages for the top pairings on the leaderboard. Each page compares only benchmarks both models actually have, with sources and dates on every number.
Claude Fable 5.1 vs Claude Opus 5.5
80.2 vs 78.4
#1 vs #2 · Anthropic vs Anthropic
Claude Fable 5.1 vs GPT-6 Astra
80.2 vs 77.6
#1 vs #3 · Anthropic vs OpenAI
Claude Fable 5.1 vs Claude Fable 5
80.2 vs 76.8
#1 vs #4 · Anthropic vs Anthropic
Claude Opus 5.5 vs GPT-6 Astra
78.4 vs 77.6
#2 vs #3 · Anthropic vs OpenAI
Claude Fable 5.1 vs Claude Opus 5
80.2 vs 74.9
#1 vs #5 · Anthropic vs Anthropic
Claude Opus 5.5 vs Claude Fable 5
78.4 vs 76.8
#2 vs #4 · Anthropic vs Anthropic
Claude Fable 5.1 vs GPT-6.1 Sol
80.2 vs 73.0
#1 vs #6 · Anthropic vs OpenAI
Claude Opus 5.5 vs Claude Opus 5
78.4 vs 74.9
#2 vs #5 · Anthropic vs Anthropic
GPT-6 Astra vs Claude Fable 5
77.6 vs 76.8
#3 vs #4 · OpenAI vs Anthropic
Claude Opus 5.5 vs GPT-6.1 Sol
78.4 vs 73.0
#2 vs #6 · Anthropic vs OpenAI
GPT-6 Astra vs Claude Opus 5
77.6 vs 74.9
#3 vs #5 · OpenAI vs Anthropic
GPT-6 Astra vs GPT-6.1 Sol
77.6 vs 73.0
#3 vs #6 · OpenAI vs OpenAI
Claude Fable 5 vs Claude Opus 5
76.8 vs 74.9
#4 vs #5 · Anthropic vs Anthropic
Claude Fable 5 vs GPT-6.1 Sol
76.8 vs 73.0
#4 vs #6 · Anthropic vs OpenAI
Claude Opus 5 vs GPT-6.1 Sol
74.9 vs 73.0
#5 vs #6 · Anthropic vs OpenAI
A pairing gets a page when both models have enough sourced data for a fair comparison — no thin pages.