OpenAI Offers 50% Discount on GPT-5.6 Sol via OpenRouter and Vercel

OpenAI's flagship model GPT-5.6 Sol is being offered at a 50% discount on both OpenRouter and Vercel AI Gateway, with the promotion valid until September 18, 2026. The discount takes effect automatically, requiring no code changes from developers. It covers all token types and service tiers on both platforms, while the model ID remains unchanged.

Regarding specific pricing, Vercel AI Gateway's published rates show the Default tier input price reduced from $5 to $2.5 per million tokens, and output from $30 to $15. The Flex tier drops to $1.25 for input and $7.5 for output, while the Priority tier falls from $10 and $60 to $5 and $30, respectively. OpenRouter applies the same discount across its standard, batch, Flex, and Priority tiers. The discount applies only to non-BYOK requests—that is, traffic routed through the platforms to OpenAI's provider—while customers using their own keys continue to pay the original rates.

OpenAI's official API pricing remains unchanged, and no adjustments have been made to other channels such as Azure or Bedrock. On July 30, OpenAI cut prices for the Luna and Terra models in the same series, but the Sol flagship price was left untouched. This discount is a platform-side promotional move limited to the two mentioned platforms and does not reflect a change in overall pricing strategy.