GPT-5.6 Sol Scores 59 on AI Index, Costs One-Third of Claude Fable 5

OpenAI’s GPT-5.6 Sol achieved a score of 59 on the Artificial Analysis Intelligence Index, closely matching Anthropic’s Claude Fable 5. The cost per task for GPT-5.6 Sol is $1.04, which is one-third of the cost of Anthropic’s top model. This pricing strategy is expected to increase competitive pressure on Anthropic, as noted by an unverified claim stating that ‘Sol beats every competitor.’ This development follows OpenAI’s recent advancements in AI model performance and cost efficiency, further solidifying its position in the market. For practitioners, the lower cost of GPT-5.6 Sol may influence decisions on model selection for budget-sensitive applications. More details can be found in The Decoder.