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

Which is better for the money: Claude Fable 5.1 (High, Default Fallback) by Anthropic or GPT-6 Astra (Medium) by OpenAI? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-26.

Trade-off

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

Intelligence: 51.20
Total cost: $5242

OpenAIGPT-6 Astra (Medium)Off the frontier

Intelligence: 49.60
Total cost: $2434

Verdict

Depends on your budget

Claude Fable 5.1 (High, Default Fallbac… scores 1.6 points higher (51.2 vs 49.6) but costs 2.2× as much to run the benchmark ($5242 vs $2434; both flagship class). Pick Claude Fable 5.1 (High, Default Fallbac… when the extra intelligence is worth the premium, otherwise GPT-6 Astra (Medium).

Metric	Claude Fable 5.1 (High, Default Fallback)	GPT-6 Astra (Medium)	Difference
Intelligence (higher is better)	51.2	49.6	−3.1% GPT-6 Astra (Medium) is 3.1% less intelligent
Total AA cost (lower is better)	$5,241.59	$2,434.12	−53.6% GPT-6 Astra (Medium) is 53.6% cheaper
End-to-end time (lower is better)	28.41s	14.16s	−50.2% GPT-6 Astra (Medium) is 50.2% faster
Price per 1M tokens (in / out)	$10.0 / $50.0	$10.0 / $50.0
Input modalities	Text, Image	Text, Image

GPT-6 Astra (Medium) vs Claude Fable 5.1 (High, Default Fallback): 3.1% less intelligence, 53.6% less cost to run the AA benchmark, and 50.2% faster end-to-end.

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

Today's Pareto frontier

Against the frontier

Claude Fable 5.1 (High, Default Fallback) is off the frontier: at the same or lower cost, Claude Opus 5.5 (Xhigh, Default Fallback) scores 56.00 for $4057.
GPT-6 Astra (Medium) 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 (High, Default Fallback)GPT-6 Astra (Medium)Today's Pareto frontierEvery other model

Matchup

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