Will this work with Shimano Sora STI levers?

No — the Claris R2000 front derailleur is calibrated for Claris 8-speed STI levers. Sora is 9-speed and uses different cable pull ratios.

Do I need the rear derailleur to be Claris too?

For correct indexed shifting, the front derailleur, rear derailleur, STI levers, cassette, and chain should all match the same speed count (8-speed for Claris R2000).

Shimano

Shimano CLARIS R2000 Front Derailleur (Brazed-On Mount) 2x8-speed

Name: Shimano CLARIS R2000 Front Derailleur (Brazed-On Mount) 2x8-speed
Brand: Shimano
SKU: EFDR2000F
Price: 1800.00 INR
Availability: InStock
Author: InstaSport Editorial

₹1800.00

Description

SHIMANO CLARIS - Front Derailleur - Brazed-On Mount - Road - 2x8-speed Compatible with 2x8 road drivetrains, the SHIMANO CLARIS R2000 front derailleur increases road riding enjoyment through light action and smooth gear transitions. SPECIFICATIONS: MODEL NO FD-R2000-F SERIES CLARIS R2000 Series Colo