Several AI services, including GPTunnel, are offering promotional codes that provide bonuses on initial deposits. However, these bonuses often come with significant markups on token prices once the promotion ends, with GPTunnel reportedly charging up to 280% more than official prices for models like Claude Opus and GPT-5. While some services like Perplexity, Gamma, and Kling have legitimate referral programs, the high markups suggest that the post-promotion pricing is the actual business model, rather than a temporary deviation. AI
IMPACT Users should be aware of significant price markups after initial promotional offers from AI service providers.
RANK_REASON Article discusses pricing and promotional tactics of AI services, not a core AI release or research.
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