[OpenRouter Lowers GPT-5.6 Sol Call Fees: Input Reduced to $2.5 per Million Tokens] According to Deep Tide TechFlow, on August 18, OpenRouter announced a 50% reduction in call fees for OpenAI's most advanced model, GPT-5.6 Sol. After the adjustment, the cost is $2.5 per million tokens for input and $15 for output. Another hosting platform, Vercel, has also launched a limited-time 50% discount, valid for one month until September 18, 2026, applicable to both Standard and Fast modes. Media outlet SemiAnalysis believes this is a marketing strategy to attract more users to adopt the model.