Claude Fable 5.1 vs GLM-5.3
Claude Fable 5.1 and GLM-5.3 are closely matched at 57.0 and 53.8 on the LLM Stats Score. GLM-5.3 is 9.3x cheaper per token.
Anthropic · Zhipu AI · Updated for 2026
Which is better?
Claude Fable 5.1 and GLM-5.3 are closely matched on the overall LLM Stats Score at 57.0 and 53.8.
In the 4 individual benchmarks reported for both models, Claude Fable 5.1 wins 3; this is a narrower head-to-head signal than the composite indexes.
On price, GLM-5.3 is roughly 9.3x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose Claude Fable 5.1
- you value its reported benchmark strengths — it wins 3 of 4 exact shared results
- you want the most recent training data — it shipped Sep 2026
Choose GLM-5.3
- cost matters — it's about 9.3x cheaper per token
At a glance
The differences that matter most.
Capability indexes
Additional strengths measured across groups of related public benchmarks
Individual benchmarks
7 reported for Claude Fable 5.1 · 17 for GLM-5.3
Claude Fable 5.1 outperforms in 3 benchmarks (GDPval-AA, Humanity's Last Exam, Terminal-Bench 4.0), while GLM-5.3 is better at 1 benchmark (AutomationBench).
Claude Fable 5.1 shows notably better performance in the majority of benchmarks.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, Claude Fable 5.1 ($10.00/1M tokens) is 7.1x more expensive than GLM-5.3 ($1.40/1M tokens).
For output processing, Claude Fable 5.1 ($50.00/1M tokens) is 11.4x more expensive than GLM-5.3 ($4.40/1M tokens).
In conclusion, Claude Fable 5.1 is more expensive than GLM-5.3.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Both models have the same input context window of 1,000,000 tokens. GLM-5.3 can generate longer responses up to 131,072 tokens, while Claude Fable 5.1 is limited to 128,000 tokens.
Input capabilities
Documented input modalities across available providers
Claude Fable 5.1 supports multimodal inputs, whereas GLM-5.3 does not.
Claude Fable 5.1 can handle both text and other forms of data like images, making it suitable for multimodal applications.
Claude Fable 5.1
GLM-5.3
Release Timeline
When each model was launched
Claude Fable 5.1 was released on 2026-09-01, while GLM-5.3 was released on 2026-08-14.
Claude Fable 5.1 is 1 month newer than GLM-5.3.
Sep 1, 2026
1 days ago
2w newerAug 14, 2026
2 weeks ago
Knowledge Cutoff
When training data ends
Neither model specifies a knowledge cutoff date.
Unable to compare the recency of their training data.
Provider Availability
Claude Fable 5.1 is available from Anthropic. GLM-5.3 is available from FriendliAI, Novita, ZAI.
Claude Fable 5.1
GLM-5.3
Outputs Comparison
Judge for yourself.
Run your own prompts against Claude Fable 5.1 and GLM-5.3 side-by-side, then vote on the output you prefer.
FAQ
Common questions about Claude Fable 5.1 vs GLM-5.3.