Analysis Reveals Cost Changes with GPT-5.5 Compared to GPT-5.4

May 8, 2026

AI Summary

The launch of GPT-5.5 has resulted in a price increase of 100% for input and output tokens compared to GPT-5.4. While users may face cost increases of 49-92%, the model's shorter completions for longer prompts can mitigate some of these costs.

GPT-5.5 launched with a price increase of 100% over GPT-5.4, with input tokens rising from $2.50/M to $5.00/M and output tokens from $15/M to $30/M.
The model produces 19-34% fewer completion tokens for prompts over 10K tokens, which helps offset the increased costs.
For prompts under 10K tokens, costs have increased significantly, as completions did not decrease in length.
A controlled analysis was conducted on users who switched from GPT-5.4 to GPT-5.5, allowing for a direct comparison of costs and usage.
The study found that actual costs for GPT-5.5 increased between 49% and 92% depending on the prompt length.

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Analysis Reveals Cost Changes with GPT-5.5 Compared to GPT-5.4

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