GPT-5.5 API pricing — what it really costs
GPT-5.5 (OpenAI) costs $5 per 1M input tokens and $30 per 1M output tokens — with prompt caching, cached input drops to $0.500. Model flagowy. Prices verified 2026-07-05; we track the price you are actually billed today, including promotional rates.
Price per 1M tokens
| Input | Output | Cached input |
|---|---|---|
| $5 | $30 | $0.500 |
Real monthly costs on GPT-5.5
Three realistic workloads, computed from the prices above (cached share billed at the cache-read rate where the provider offers one):
Customer-support chatbot
$19.60/mo
2M input + 0.5M output tokens/month, 60% of input served from prompt cache
RAG / document Q&A
$67.00/mo
20M input + 1M output tokens/month, 70% cached (shared context)
Agentic coding assistant
$220/mo
50M input + 5M output tokens/month, 80% cached (long sessions)
Want exact numbers for your usage? Open the calculator — same verified prices, your token volumes.
Compare GPT-5.5
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FAQ
How much does the GPT-5.5 API cost?
GPT-5.5 costs $5 per 1M input tokens and $30 per 1M output tokens. Cached input tokens cost $0.500 per 1M. Note: Model flagowy. Pricing verified 2026-07-05.
What does a typical workload cost on GPT-5.5?
Customer-support chatbot: about $19.60/month (2M input + 0.5M output tokens/month, 60% of input served from prompt cache). RAG / document Q&A: about $67.00/month (20M input + 1M output tokens/month, 70% cached (shared context)). Agentic coding assistant: about $220/month (50M input + 5M output tokens/month, 80% cached (long sessions))
Is GPT-5.5 expensive compared to other models?
GPT-5.5 ranks #13 of 15 models by blended price in our comparison. The cheapest tracked model is DeepSeek V4 Flash at $0.140/$0.280 per 1M tokens.