Claude Fable 5.1 (Xhigh, Default Fallback) vs GPT-6 Astra (High)

Which is better for the money: Claude Fable 5.1 (Xhigh, Default Fallback) by Anthropic or GPT-6 Astra (High) by OpenAI? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-27.

Trade-off

AnthropicClaude Fable 5.1 (Xhigh, Default Fallback)Off the frontier

Intelligence: 53.20
Total cost: $9063

OpenAIGPT-6 Astra (High)Off the frontier

Intelligence: 50.90
Total cost: $2925

Verdict

Depends on your budget

Claude Fable 5.1 (Xhigh, Default Fallba… scores 2.3 points higher (53.2 vs 50.9) but costs 3.1× as much to run the benchmark ($9063 vs $2925; both flagship class). They are not alternatives at one budget: pick Claude Fable 5.1 (Xhigh, Default Fallba… when you need intelligence above 50.9, and GPT-6 Astra (High) when 50.9 is enough.

Metric	Claude Fable 5.1 (Xhigh, Default Fallback)	GPT-6 Astra (High)	Difference
Intelligence (higher is better)	53.2	50.9	−4.3% GPT-6 Astra (High) is 4.3% less intelligent
Total AA cost (lower is better)	$9,063.11	$2,925.01	−67.7% GPT-6 Astra (High) is 67.7% cheaper
End-to-end time (lower is better)	111.68s	59.78s	−46.5% GPT-6 Astra (High) is 46.5% faster
Price per 1M tokens (in / out)	$10.0 / $50.0	$10.0 / $50.0
Input modalities	Text, Image	Text, Image

GPT-6 Astra (High) vs Claude Fable 5.1 (Xhigh, Default Fallback): 4.3% less intelligence, 67.7% less cost to run the AA benchmark, and 46.5% faster end-to-end.

Open this matchup in the interactive picker Claude Fable 5.1 (Xhigh, Default Fallback): what beats it GPT-6 Astra (High): what beats it

Today's Pareto frontier

Against the frontier

Claude Fable 5.1 (Xhigh, Default Fallback) is off the frontier: at the same or lower cost, Claude Opus 5.5 (Max, Default Fallback) scores 57.60 for $8708.
GPT-6 Astra (High) is off the frontier: at the same or lower cost, Claude Opus 5.5 (High, Default Fallback) scores 53.60 for $2172.

Claude Fable 5.1 (Xhigh, Default Fallback)GPT-6 Astra (High)Today's Pareto frontierEvery other model

Matchup

Compare something else

Agents: Accept: text/markdown or ?format=md returns this page as Markdown. JSON: /api/v1/compare/claude-fable-5-1-xhigh/gpt-6-astra-high · Markdown: /api/v1/compare/claude-fable-5-1-xhigh/gpt-6-astra-high?format=md · llms.txt · agent skill