GPT-5.5 Price Increase: What It Actually Costs

The analysis of the cost impact of the GPT-5.5 model, which launched with a 2x price increase over GPT-5.4, reveals that while input and output token costs doubled, the model's less verbose nature for longer prompts somewhat mitigates the price rise. The study, focusing on users who switched from GPT-5.4 to GPT-5.5, found cost increases ranging from 49% to 92%, with the model generating 19-34% fewer completion tokens for prompts exceeding 10K tokens. However, for shorter prompts under 10K tokens, the model produced longer completions, leading to a higher cost increase. The methodology involved a direct comparison of the same user base's costs across model versions, using OpenRouter's token counts for normalization and excluding non-text and cancelled requests.

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