GPT-5.5 pricing
GPT-5.5 costs $5 per million input tokens and $30 per million output tokens , with cached input at $0.5. Its context window is 272K tokens. Batch requests are discounted 50%.
Price per million tokens
| Input | $5 |
| Cached input | $0.5 |
| Output | $30 |
| Context window | 272K tokens |
| Batch discount | −50% |
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 | $0.0175 | $1,748 |
| RAG / document Q&A | 12k in / 700 out, 50k requests/month, 60% cached | $0.0486 | $2,430 |
| Coding agent | 25k in / 2.5k out, 20k requests/month, 80% cached | $0.11 | $2,200 |
Model your own workload with caching, batching and tokenizer correction →
Comparable models from other providers
| Model | Provider | Input | Output |
|---|---|---|---|
| Claude Opus 5 | Anthropic | $5 | $25 |
| Claude Opus 4.8 | Anthropic | $5 | $25 |
| Claude Opus 4.7 | Anthropic | $5 | $25 |
| Claude Opus 4.6 | 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.