OpenAI: GPT-5 Nano vs OpenAI: GPT-6 Luna
OpenAI: GPT-5 Nano is cheaper than OpenAI: GPT-6 Luna by about 31% on a blended (75% input / 25% output) basis. OpenAI: GPT-5 Nano charges $0.050000 / $0.400000 per 1M input/output tokens; OpenAI: GPT-6 Luna charges $0.100000 / $0.500000.
| Field | OpenAI: GPT-5 Nano | OpenAI: GPT-6 Luna |
|---|---|---|
| Input $/Mtok | $0.050000 | $0.100000 |
| Output $/Mtok | $0.400000 | $0.500000 |
| Cache read $/Mtok | $0.005000 | $0.010000 |
| Cache write $/Mtok | – | $0.125000 |
| Input $/Mchar | 0.014086 | 0.028171 |
| Output $/Mchar | 0.112686 | 0.140857 |
| Context window | 400000 | 1050000 |
| Tokenizer | o200k | o200k |
Price history
Same workload, monthly cost
Illustrative monthly cost at 10M tokens/month, split per workload preset. Not a substitute for the calculator, which uses your own volume, cache and batch assumptions.
| Workload | OpenAI: GPT-5 Nano | OpenAI: GPT-6 Luna |
|---|---|---|
| Coding agent | $0.68 | $1.20 |
| RAG chat | $1.03 | $1.60 |
| Summarisation (batch) | $0.85 | $1.40 |
| Classification | $0.57 | $1.08 |
| Chat assistant | $1.90 | $2.60 |
| Content generation | $3.30 | $4.20 |
Cite this page
OpenAI: GPT-5 Nano vs OpenAI: GPT-6 Luna: $0.050000/$0.400000 vs $0.100000/$0.500000 per 1M tokens, as of 2026-10-04 (Token Barometer, https://tokenbarometer.com/compare/openai_gpt-5-nano-vs-openai_gpt-6-luna).
OpenAI: GPT-5 Nano page | OpenAI: GPT-6 Luna page | Open in calculator