GPT-5.5 Pro pricing
GPT-5.5 Pro costs $30 per million input tokens and $180 per million output tokens . Its context window is 272K tokens.
Price per million tokens
| Input | $30 |
| Cached input | — |
| Output | $180 |
| Context window | 272K tokens |
| Batch discount | not offered |
What it costs in practice
Monthly cost for three common workload shapes, with prompt caching applied.
| Workload | Shape | Per request | Per month |
|---|---|---|---|
| Support chatbot | 1.5k in / 400 out, 100k requests/month, 30% cached | $0.117 | $11,700 |
| RAG / document Q&A | 12k in / 700 out, 50k requests/month, 60% cached | $0.486 | $24,300 |
| Coding agent | 25k in / 2.5k out, 20k requests/month, 80% cached | $1.20 | $24,000 |
Model your own workload with caching, batching and tokenizer correction →
Comparable models from other providers
| Model | Provider | Input | Output |
|---|---|---|---|
| Claude Fable 5 | Anthropic | $10 | $50 |
| Claude Mythos 5 | Anthropic | $10 | $50 |
| Claude Opus 5 | Anthropic | $5 | $25 |
| Claude Opus 4.8 | Anthropic | $5 | $25 |
All figures verified 2026-08-18 against OpenAI's official pricing documentation . Fields the provider does not publish are shown as “—” rather than estimated.