GPT-5.4 API pricing — what it really costs
GPT-5.4 (OpenAI) costs $2.50 per 1M input tokens and $15 per 1M output tokens — with prompt caching, cached input drops to $0.250. Prompts up to 272K tokens; longer prompts cost more. Prices verified 2026-10-17; we track the price you are actually billed today, including promotional rates.
Price per 1M tokens
| Input | Output | Cached input |
|---|---|---|
| $2.50 | $15 | $0.250 |
Real monthly costs on GPT-5.4
Three realistic workloads, computed from the prices above (cached share billed at the cache-read rate where the provider offers one):
Customer-support chatbot
$9.80/mo
2M input + 0.5M output tokens/month, 60% of input served from prompt cache
RAG / document Q&A
$33.50/mo
20M input + 1M output tokens/month, 70% cached (shared context)
Agentic coding assistant
$110/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-5.4
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FAQ
How much does the GPT-5.4 API cost?
GPT-5.4 costs $2.50 per 1M input tokens and $15 per 1M output tokens. Cached input tokens cost $0.250 per 1M. Note: Prompts up to 272K tokens; longer prompts cost more. Pricing verified 2026-10-17.
What does a typical workload cost on GPT-5.4?
Customer-support chatbot: about $9.80/month (2M input + 0.5M output tokens/month, 60% of input served from prompt cache). RAG / document Q&A: about $33.50/month (20M input + 1M output tokens/month, 70% cached (shared context)). Agentic coding assistant: about $110/month (50M input + 5M output tokens/month, 80% cached (long sessions))
Is GPT-5.4 expensive compared to other models?
GPT-5.4 ranks #16 of 23 models by blended price in our comparison. The cheapest tracked models are Claude Haiku 5.5 and GPT-6 Luna at $0.100/$0.500 per 1M tokens.