Claude Fable 5.1 vs GLM 5.3 Flash
Claude Fable 5.1 
GLM 5.3 Flash Verdict
- Claude Fable 5.1 (max) leads on quality: 70.3 vs 61.1.
- Claude Fable 5.1 (max) is stronger in agents & tools, coding, composite, human preference, knowledge, maths, reasoning.
- GLM 5.3 Flash is stronger in long context, multimodal.
- GLM 5.3 Flash is 168× cheaper ($0.119 vs $20.00 per 1M blended).
- GLM 5.3 Flash streams 2.2× faster (90 vs 40 tokens per second).
| Metric | Claude Fable 5.1 (max) | GLM 5.3 Flash |
|---|---|---|
| BenchLeader Index | 70.3 | 61.1 |
| Agents & tools score | 67.4 | 52.1 |
| Coding score | 78.4 | 64.3 |
| Composite score | 76.6 | 61.7 |
| Human preference score | 71.3 | 67.6 |
| Knowledge score | 75.9 | 67.7 |
| Maths score | 77.0 | – |
| Reasoning score | 71.9 | 67.5 |
| Long context score | – | 66.6 |
| Multimodal score | – | 65.5 |
| Blended price $/M | $20.00 | $0.119 |
| Output speed | 40 tok/s | 90 tok/s |
| Time to first answer | 299.8 s | 24.9 s |
| Context window | 1M | 1M |
| FrontierMath Tiers 1–3 | 90.2% | – |
| FrontierMath Tier 4 | 87.8% | – |
| OTIS Mock AIME | 100.0% | – |
| SimpleQA Verified | 70.8% | – |
| Terminal-Bench | 57.9% | – |
| SciCode | 62.0% | 46.1% |
| WeirdML | 92.9% | – |
| ProofBench | 100.0% | – |
| Epoch Capabilities Index | – | 151.4 |
| LMArena Text | 1504 | 1474 |
| LMArena Hard Prompts | 1522 | 1496 |
| LMArena Coding | 1517 | 1534 |
| LMArena WebDev | 1764 | 1605 |
| LMArena Vision | – | 1296 |
| LMArena Agent | 14.5 | 2 |
| LiveBench | 83.4% | 71.6% |
| LiveBench Reasoning | 91.7% | 77.6% |
| LiveBench Coding | 86.4% | 79.0% |
| LiveBench Agentic Coding | 66.1% | 56.8% |
| LiveBench Mathematics | 97.0% | 81.2% |
| LiveBench Data Analysis | 80.3% | 76.4% |
| LiveBench Language | 89.5% | 77.3% |
| AA Intelligence Index | – | 41.9 |
| AA-LCR | – | 80.0% |
| AA-Omniscience | – | 7.5 |
| GPQA Diamond (AA) | – | 91.2% |
| Humanity's Last Exam (AA) | – | 39.9% |
| SciCode (AA) | – | 51.6% |
| ARC-AGI-1 | 97.5% | – |
| ARC-AGI-2 | 90.0% | – |
Data as of 2026-09-10. Best configuration of each model; every score links to its source on the model pages.
Claude Fable 5.1 vs GLM 5.3 Flash: questions
- Is Claude Fable 5.1 better than GLM 5.3 Flash?
- Claude Fable 5.1 (max) leads on quality: 70.3 vs 61.1. The BenchLeader Index combines every independent quality benchmark; Claude Fable 5.1 (max) is ahead overall as of 2026-09-10, but check the category scores for your use.
- Is Claude Fable 5.1 better than GLM 5.3 Flash for coding?
- Claude Fable 5.1 scores higher in coding (78 vs 64 on the category index, where 50 is average).
- Is Claude Fable 5.1 better than GLM 5.3 Flash for agentic tasks?
- Claude Fable 5.1 scores higher in agentic tasks (67 vs 52 on the category index, where 50 is average).
- Which is cheaper, Claude Fable 5.1 or GLM 5.3 Flash?
- GLM 5.3 Flash is cheaper: $0.119 against $20.00 per million tokens, blended at three input tokens per output token.
- Which is faster, Claude Fable 5.1 or GLM 5.3 Flash?
- GLM 5.3 Flash streams faster: 90 against 40 output tokens per second.
- Which has the larger context window?
- Both accept 1M tokens of context.