GPT-5.5 costs 49 to 92 percent more than its predecessor, depending on the input length

OpenAI doubled GPT-5.5’s listed token prices versus GPT-5.4.

OpenRouter’s April 2026 usage logs show real-world costs rose 49% to 92% depending on input length.

Shorter prompts saw the sharpest increases, even though very long prompts sometimes produced shorter outputs.

The jump raises production costs for GPT-5.5 and adds to ongoing upward pressure on AI model pricing.