GPT-5.5 Price Increase: What It Actually Costs

The Numbers: 2x Listed, Less in Practice

OpenAI launched GPT-5.5 at double the price of GPT-5.4: input tokens from $2.50/M to $5.00/M, output tokens from $15/M to $30/M. But OpenRouter analysis of real users who switched tells a different story.

How Brevity Softens the Blow

GPT-5.5 generates fewer tokens for the same tasks, especially for longer prompts. For inputs over 10,000 tokens, completions were 19-34% shorter. The result by prompt length:

Short prompts (under 2K tokens): ~92% cost increase
Long prompts (128K+ tokens): ~49% cost increase

Who Feels It Most

Users sending short frequent prompts face the steepest effective cost increase. Enterprise users running complex long-context tasks see more moderate impact as model efficiency partially compensates for the higher nominal price.

The analysis examined users whose top model by request count was GPT-5.4 before the 5.5 launch, providing a controlled comparison across identical workflows.

Market Context

GPT-5.5 pricing places it firmly in the premium tier. With Anthropic, Google, and open-source alternatives narrowing the capability gap, the cost-performance debate for GPT-5.5 is live.

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