GPT-5.5 Price Increase: What It Actually Costs

GPT-5.5, which launched with a 2x price increase from its predecessor GPT-5.4, also offers reduced verbosity for longer prompts, producing 19-34% fewer completion tokens for such prompts. The cost analysis, conducted using the same switcher cohort approach as previous studies, revealed that users experienced a cost increase between 49-92% depending on prompt length, despite the model's efficiency improvements for longer inputs. For prompts under 10,000 tokens, costs increased without the benefit of shorter completions, whereas for longer prompts, the reduction in completion length helped offset the price hike. The analysis used OpenRouter's token counts to provide a consistent baseline across model versions, excluding non-text requests and ensuring a controlled comparison within the same user cohort.

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