Model comparison
Claude Fable 5 vs GLM-5.3-Flash
Claude Fable 5 is the stronger model overall, scoring 66.8 to 51.8 on the Noometry Index. GLM-5.3-Flash costs 84× less per token, which makes it the better buy when Claude Fable 5's lead doesn't matter for your workload.
Last verified . 39 shared benchmarks.
Summary
- They share 39 benchmarks with published results for both. Claude Fable 5 scores higher in 10 categories and GLM-5.3-Flash in 0 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Fable 5 leads 88.5 to 53.3.
- The biggest single-benchmark swing is ProofBench: 95% for Claude Fable 5 and 21% for GLM-5.3-Flash.
- GLM-5.3-Flash is cheaper at $0.15 / $0.50 per million input/output tokens, against $10 / $50 for Claude Fable 5.
- GLM-5.3-Flash has downloadable open weights; the other is API-only.
Side by side
| Claude Fable 5 | GLM-5.3-Flash | |
|---|---|---|
| Provider | Anthropic | Z.ai (Zhipu) |
| Noometry Index | 66.8 | 51.8 |
| Released | 2026-06-07 | 2026-08-20 |
| Weights | Proprietary | Open |
| Context window | 1M | 1M |
| Max output | 128K | 131K |
| Input $ / M tokens | $10 | $0.15 |
| Output $ / M tokens | $50 | $0.50 |
| Results tracked | 62 | 40 |
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Category by category
Coding Claude Fable 5 leads
Claude Fable 5: 70.6 (#4), GLM-5.3-Flash: 53.1 (#31)
| Benchmark | Claude Fable 5 | GLM-5.3-Flash |
|---|---|---|
| DeepSWE | 69.9% | 63.4% |
| FrontierCode | 53.5% | 31.8% |
| LMArena WebDev | 1625 | 1609 |
| FrontierSWE | 47% | 18.1% |
| SciCode | 61% | 51.6% |
| LMArena Coding | 1519 | 1508 |
| ALE-Bench | 2,041 | 303.55 |
| CursorBench | — | 36.8% |
| GSO | 78.4% | — |
| WeirdML | 91.9% | — |
| MirrorCode | 63.9% | — |
Agentic & Tool Use Claude Fable 5 leads
Claude Fable 5: 54.0 (#2), GLM-5.3-Flash: 34.2 (#47)
| Benchmark | Claude Fable 5 | GLM-5.3-Flash |
|---|---|---|
| APEX-Agents | 63.6% | 52.8% |
| GDP.pdf | 30% | 14% |
| Remote Labor Index | 16.1% | — |
| τ²-bench Banking | 39.7% | — |
| PostTrainBench | 41.8% | — |
| GBAEval | 74.5% | — |
| LMArena Search | 1230 | — |
| Vending-Bench 2 | 5,680 | — |
Reasoning Claude Fable 5 leads
Claude Fable 5: 76.8 (#6), GLM-5.3-Flash: 48.0 (#42)
| Benchmark | Claude Fable 5 | GLM-5.3-Flash |
|---|---|---|
| ARC-AGI-2 | 89.2% | 65.8% |
| ARC-AGI-1 | 98.5% | 91% |
| CritPt | 28.6% | 15.4% |
| Chess Puzzles | 41% | 14% |
| LMArena Hard Prompts | 1508 | 1491 |
| Mystery Game Puzzles | 52% | 8% |
| Surface Evolver Bench | 95% | 52.5% |
| Bench to the Future 3 | 0.13 | 0.15 |
| Epoch Capabilities Index | 162.06 | 151.88 |
| SimpleBench | 81.9% | — |
| Kagi LLM Benchmark | 91.4% | — |
| NYT Connections (extended) | 92.7% | — |
| EnigmaEval | 39.3% | — |
| EBR-Bench | 39.5% | — |
| DTBench | 98.4% | — |
| LMCA | 61.1% | — |
Math Claude Fable 5 leads
Claude Fable 5: 88.5 (#5), GLM-5.3-Flash: 53.3 (#47)
| Benchmark | Claude Fable 5 | GLM-5.3-Flash |
|---|---|---|
| FrontierMath (Tiers 1-3) | 87% | 55.8% |
| FrontierMath Tier 4 | 90.2% | 17.1% |
| OTIS Mock AIME 2024-2025 | 100% | 93.9% |
| ProofBench | 95% | 21% |
| LMArena Math | 1519 | 1500 |
| FrontierMath Erdős | 0% | — |
Knowledge Claude Fable 5 leads
Claude Fable 5: 62.2 (#25), GLM-5.3-Flash: 58.4 (#36)
| Benchmark | Claude Fable 5 | GLM-5.3-Flash |
|---|---|---|
| GPQA Diamond | 85.9% | 90.2% |
| LMArena Expert | 1534 | 1513 |
| SimpleQA Verified | 70.7% | — |
Multimodal Claude Fable 5 leads
Claude Fable 5: 45.3 (#17), GLM-5.3-Flash: 42.8 (#27)
| Benchmark | Claude Fable 5 | GLM-5.3-Flash |
|---|---|---|
| LMArena Vision | 1324 | 1296 |
| Blueprint-Bench 2 | 38.6% | — |
| Furniture Assembly | 35.8% | — |
| LMArena Document | 1496 | — |
Multilingual Claude Fable 5 leads
Claude Fable 5: 57.3 (#9), GLM-5.3-Flash: 56.0 (#25)
| Benchmark | Claude Fable 5 | GLM-5.3-Flash |
|---|---|---|
| LMArena Non-English | 1481 | 1462 |
| LMArena Chinese | 1543 | 1527 |
| LMArena French | 1505 | 1496 |
| LMArena German | 1486 | 1470 |
| LMArena Japanese | 1506 | 1429 |
| LMArena Korean | 1488 | 1446 |
| LMArena Russian | 1504 | 1469 |
| LMArena Spanish | 1498 | 1471 |
Instruction Following Claude Fable 5 leads
Claude Fable 5: 78.6 (#8), GLM-5.3-Flash: 77.5 (#20)
| Benchmark | Claude Fable 5 | GLM-5.3-Flash |
|---|---|---|
| LMArena Instruction Following | 1502 | 1478 |
Long Context Too close to call
Claude Fable 5: 46.3 (#23), GLM-5.3-Flash: 45.4 (#39)
| Benchmark | Claude Fable 5 | GLM-5.3-Flash |
|---|---|---|
| LMArena Longer Query | 1509 | 1482 |
Writing & Preference Claude Fable 5 leads
Claude Fable 5: 75.9 (#5), GLM-5.3-Flash: 65.3 (#50)
| Benchmark | Claude Fable 5 | GLM-5.3-Flash |
|---|---|---|
| LMArena Text | 1491 | 1471 |
| LMArena Creative Writing | 1494 | 1442 |
| LMArena Multi-Turn | 1504 | 1467 |
| EQ-Bench Creative Writing | 1943 | — |
| EQ-Bench 4 | 1340 | — |
Frequently asked questions
Is Claude Fable 5 better than GLM-5.3-Flash?
Claude Fable 5 is the stronger model overall, scoring 66.8 to 51.8 on the Noometry Index. GLM-5.3-Flash costs 84× less per token, which makes it the better buy when Claude Fable 5's lead doesn't matter for your workload.
Which is cheaper, Claude Fable 5 or GLM-5.3-Flash?
GLM-5.3-Flash is cheaper. It lists at $0.15 per million input tokens and $0.50 per million output tokens; Claude Fable 5 lists at $10 and $50.
Is Claude Fable 5 or GLM-5.3-Flash better for coding?
Claude Fable 5 scores higher on coding benchmarks: 70.6 versus 53.1 in the Noometry coding category.
Which has the bigger context window?
Both accept 1M tokens.
How many benchmarks do Claude Fable 5 and GLM-5.3-Flash share?
39 benchmarks have published results for both models. Claude Fable 5 has 62 scored results on Noometry and GLM-5.3-Flash has 40.