Claude Fable 5.1 (Xhigh, Default Fallback) vs GLM-5.1 (Reasoning)

Which is better for the money: Claude Fable 5.1 (Xhigh, Default Fallback) by Anthropic or GLM-5.1 (Reasoning) by Z AI? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-26.

Trade-off

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

Intelligence: 53.20
Total cost: $9063

Z AIGLM-5.1 (Reasoning)Off the frontier

Intelligence: 26.10
Total cost: $1487

Verdict

Depends on your budget

Claude Fable 5.1 (Xhigh, Default Fallba… scores 27.1 points higher (53.2 vs 26.1) but costs 6.1× as much to run the benchmark ($9063 vs $1487; flagship vs premium cost classes). They are not alternatives at one budget: pick Claude Fable 5.1 (Xhigh, Default Fallba… when you need intelligence above 26.1, and GLM-5.1 (Reasoning) when 26.1 is enough.

Metric	Claude Fable 5.1 (Xhigh, Default Fallback)	GLM-5.1 (Reasoning)	Difference
Intelligence (higher is better)	53.2	26.1	−50.9% GLM-5.1 (Reasoning) is 50.9% less intelligent
Total AA cost (lower is better)	$9,063.11	$1,486.78	−83.6% GLM-5.1 (Reasoning) is 83.6% cheaper
End-to-end time (lower is better)	86.63s	61.77s	−28.7% GLM-5.1 (Reasoning) is 28.7% faster
Price per 1M tokens (in / out)	$10.0 / $50.0	$1.28 / $4.07
Input modalities	Text, Image	Text

GLM-5.1 (Reasoning) vs Claude Fable 5.1 (Xhigh, Default Fallback): 50.9% less intelligence, 83.6% less cost to run the AA benchmark, and 28.7% faster end-to-end.

Open this matchup in the interactive picker Claude Fable 5.1 (Xhigh, Default Fallback): what beats it GLM-5.1 (Reasoning): 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.
GLM-5.1 (Reasoning) is off the frontier: at the same or lower cost, GPT-6.1 Sol (Max) scores 51.80 for $1082.

Claude Fable 5.1 (Xhigh, Default Fallback)GLM-5.1 (Reasoning)Today's Pareto frontierOpen-weights 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/glm-5-1 · Markdown: /api/v1/compare/claude-fable-5-1-xhigh/glm-5-1?format=md · llms.txt · agent skill