The closest alternative to GPT-5.4 Image 2 is GPT-5.6 Luna Pro — comparable intelligence (— vs —); for a cheaper option, Claude Opus 5 runs $5.00/M vs $8.00/M; and the best open-weight substitute is Kimi K3.
GPT-5.6 Luna Pro is the closest alternative to GPT-5.4 Image 2, with an Intelligence Index of — (GPT-5.4 Image 2 scores —) at $0.100 per million input tokens.
Yes — Claude Opus 5 costs $5.00 per million input tokens versus $8.00 for GPT-5.4 Image 2, while staying within ~8 points of its Intelligence Index.
Kimi K3 is the strongest open-weight alternative to GPT-5.4 Image 2 — downloadable from Hugging Face and self-hostable, scoring 57.1 on intelligence.