GPT-5.4 vs GPT-5.5 Pro
openai/gpt-5.4 · openai/gpt-5.5-pro
As of October 31, 2026, GPT-5.4 is the cheaper API on UberLLM: $0.8125 per million input tokens and $4.87 per million output, versus $24.51 / $147.06 for GPT-5.5 Pro, about 97% less when output is 3 tokens for every input token. These are the median prices buyers paid over the last 24 hours. Both work with one OpenAI-compatible key and UberLLM adds no fee. Choose GPT-5.4 to cut cost; choose GPT-5.5 Pro when its capabilities fit your task better.
GPT-5.4 vs GPT-5.5 Pro, side by side
| Spec | GPT-5.4 | GPT-5.5 Pro |
|---|---|---|
| Price · input / 1M | $0.8125 | $24.51 |
| Price · output / 1M | $4.87 | $147.06 |
| Context length | 1,000,000 | 1,000,000 |
| Max output tokens | 131,072 | 128,000 |
| Input modalities | text, image | text, image |
| Output modalities | text | text |
| Tools / functions | Yes | Yes |
| Vision (image input) | Yes | Yes |
| Reasoning | Yes | Yes |
| % off list | 68% off | 18% off |
Median prices buyers paid on UberLLM over the last 24 hours. No UberLLM fee on requests; adding credit by card costs 5.5% + $0.50. Updated October 31, 2026.
GPT-5.4 vs GPT-5.5 Pro — FAQ
Is GPT-5.4 or GPT-5.5 Pro cheaper?
GPT-5.4 is cheaper on a blended token mix, by about 97%. A request costs what its provider charged, UberLLM adds no fee, and every request is listed with its cost in Activity.
What's the price difference between GPT-5.4 and GPT-5.5 Pro?
GPT-5.4: $0.8125 in / $4.87 out per 1M tokens. GPT-5.5 Pro: $24.51 in / $147.06 out per 1M tokens. That's roughly a 97% blended difference. Prices are live; UberLLM adds no fee.
Can I use both GPT-5.4 and GPT-5.5 Pro with one API?
Yes. Both are served through a single OpenAI-compatible endpoint — set the base URL to https://api.uberllm.dev/v1 and your UberLLM key, then switch between them by changing the model id. Anthropic SDKs work via https://api.uberllm.dev/v1/messages.