Sources of stimulated coherent emission in all visible range are highly demanded for numerous applications in photonic and optoelectronic devices. In that regard, metal halide perovskite-based microlasers are established to be promising objects due to their low-threshold and lasing with high quality factor (more than 1000) at room temperature. However, there are still challenges in synthesis of stable and uniform crystals emitting red light. This work presents a novel sublimation synthesis method to produce mixed-anion perovskite CsPb(Br,I)3 microwires that generate laser emission in red region of visible range. An increase in the iodine content in the structure contributes to a red-shift in photoluminescence from 530 nm to 680 nm. CsPb(Br,I)3 microwires demonstrate multimode laser generation with threshold at 70 mJ/cm2 and Q-factor near 1500. A uniform distribution of bromine and iodine ions in the structure is confirmed by energy dispersive x-ray analysis. Additionally, study of surface morphology by scanning electron microscopy showed core-shell like structure, which can improve long-term stability of obtained crystals. Our study reveals the sublimation as a promising synthesis method to produce low-threshold red microlasers that emit light at room temperature.