GLM-5.3 vs Claude Fable 5
API pricing, benchmark indices and specs — updated 19 October 2026.
anthropic · B · API-only
Input / 1M
$10.00
Output / 1M
$50.00
AA index
49.6
proprietary · 1M context
Specification comparison
Differences are highlighted; identical values are muted.
| Specification | GLM-5.3 | Claude Fable 5 |
|---|---|---|
| Deployment | Open weights · also via API | API-only (closed weights) |
| Parameters | 753.3 B | n/a — API-only |
| Architecture | GlmMoeDsaForCausalLM | n/a — API-only |
| Context length | 1,048,576 | 1,000,000 |
| Licence | other | Proprietary |
| Commercial use | Unknown | Per API terms |
| Languages | 2 | n/a — API-only |
| Downloads 30d | 1,942,665 | n/a — API-only |
| Downloads all time | 3.1 M | n/a — API-only |
| Quantizations on the Hub | SAFETENSORS | n/a — API-only |
| Gated | No | n/a — API-only |
| First seen on the Hub | 2026-08-25 | n/a — API-only |
| API input price / 1M tokens | $0.079 | $10.00 |
| API output price / 1M tokens | $1.40 | $50.00 |
| Est. cost per 1M input + 1M output tokens | $1.48 | $60.00 |
| Cached input / 1M tokens | $0.078 | $1.00 |
| AA Intelligence Index | 44.8 | 49.6 |
| AA Coding Index | 74.8 | 76.5 |
| AA Agentic Index | 53.1 | 50.7 |
| Max output tokens | 943,718 | 128,000 |
| API providers | 37 | 5 |
| Tool calling | Yes | Yes |
| Reasoning mode | Yes | Yes |
API cost
Estimated cost of 1M input + 1M output tokens via OpenRouter
GLM-5.3
$1.48
Claude Fable 5
$60.00
GLM-5.3 is 40.6× cheaper at list price.
VRAM side by side
On RTX 4090 · 24 GB · 8K context unless noted
GLM-5.3 · fp16 @ 1024K ctx
15,295.6 GB / 24 GB