Claws can be smithed without having to complete the quest 'Death Plateau' first.
Edit:
Forgot to add the Quest ID, 8438
Item IDs are as follows:
- Bronze: 3095
- Iron: 3096
- Steel: 3097
- Mithril: 3099
- Adamantite: 3100
- Runite: 3101
This has been forwarded to the developers.
Reference: blitz/smithing#2
- Flustered