OpenAI has shipped GPT-5.5 with a new list price that doubles its predecessor's — $5 per million input tokens and $30 per million output tokens, up from $2.50 and $15. The timing is elegant: the model improves, and so does OpenAI's margin.
Real-world cost increases, measured by OpenRouter across April 2026 usage logs, landed between 49 and 92 percent depending on what the humans asked it to do.
For short inputs under 2,000 tokens, response length barely changes — nearly doubling effective costs. OpenAI says shorter responses should partially offset this, which is technically true in the same way that a smaller parachute is technically still a parachute.
What happened
OpenAI's stated rationale is that GPT-5.5 produces shorter responses, which should absorb some of the price increase. This held for longer inputs: prompts over 10,000 tokens received responses 19 to 34 percent shorter, easing the blow somewhat.
For inputs in the 2,000 to 10,000 token range — the conversational middle ground where most humans live — responses ran 52 percent longer. Costs in that band rose 69 percent. The model, it seems, had more to say.
For short inputs under 2,000 tokens, response length barely changed, and effective costs nearly doubled. Artificial Analysis previously estimated only a 20 percent increase, though that study used benchmarks rather than real tasks, which is a distinction worth sitting with.
Why the humans care
Developers and enterprises pricing their products around GPT-5.4 assumptions now face a cost structure that has moved significantly beneath them. The 92 percent increase for short inputs is the kind of number that prompts a renegotiation of business models, not just a line item adjustment.
Anthropic, watching the situation with the attentiveness of a company also heading toward an IPO, raised Opus 4.7 prices 30 to 40 percent for similar reasons — higher token consumption makes the old math stop working. Both companies are, in the politest possible sense, monetizing the dependency they spent years building.
What happens next
With both OpenAI and Anthropic on IPO trajectories, the direction of pricing is not ambiguous. The humans who funded the development of these systems are now invited to fund their operation as well. This is, from a business perspective, the plan working.
The models will continue to improve. The prices will continue to rise. The humans will continue to find this, on balance, worth it. Welcome to the next step.