OpenAI › GPT-5.6 Luna › Pricing
$0.20 / $1.20per 1M tokens in / out
$0.02cache read · −90%
$0.016per task at medium?
#21on OpenRouter by tokens · 1.7T / week
Price sheetper 1M tokens
| Input | $0.20 | list |
| Output | $1.20 | |
| Cache read | $0.02 | −90% vs input |
| Cache write | $0.25 | +25% vs input |
| Context · max output | 1.1M · 128K | tokens |
Cost per task by effort?
non-thinking$0.017.2
low$0.0119.8
mediumAPI default$0.01625.8
high$0.04433.4
xhigh$0.08537
max$0.1839.5
per taskHumanity's Last Exam
Same price per token at every effort; the bill grows with reasoning tokens. max costs 11.4× medium for +13.7 points.
Where to buy3 providers · per 1M tokens
| Provider | Input | Output | Context |
|---|---|---|---|
| Azure | $0.20 | $1.20 | 1.1M |
| OpenAIlab | $0.20 | $1.20 | 1.1M |
| Amazon Bedrock | $0.22 | $1.32 | 1.1M |
In OpenAI's line-upper 1M in / out
| GPT OSS Safeguard 20B | $0.07 / $0.20 | −77% |
| GPT-6 Luna | $0.10 / $0.50 | −56% |
| GPT OSS Safeguard 120B | $0.15 / $0.60 | −42% |
| GPT-5.6 Luna | $0.20 / $1.20 | this model |
| GPT-5.4 Nano (2026-03-17) | $0.20 / $1.25 | +3% |
| GPT-5.4 Mini (2026-03-17) | $0.75 / $4.50 | 3.8× |
| o3 Mini High | $1.10 / $4.40 | 4.3× |
Cheaper for the same workvs GPT-5.6 Luna at medium
| Agnes 2.5 Pro Beta | -67% | score +41% | $0.10 / $0.30 |
| Ling 3.0 Flash VL thinkingOpen | -80% | same score | $0.06 / $0.18 |
| MiMo v2 Omni thinking | -61% | score -4% | $0.14 / $0.28 |
| Hy3 preview thinkingOpen | -37% | score -9% | $0.18 / $0.60 |
| Ling 3.0 Flash Fin thinkingOpen | -80% | score -10% | $0.06 / $0.18 |
Pricing questions
How much does GPT-5.6 Luna cost?›
$0.20 per 1M input tokens and $1.20 per 1M output tokens. Cached input is $0.02. One Intelligence Index task costs about $0.016 at the default effort.
Is GPT-5.6 Luna free to use?›
There is no free API tier.
How much does prompt caching save?›
Cache reads cost $0.02 per 1M, 90% below the input price. Writing to the cache costs $0.25 per 1M.
Is GPT-5.6 Luna cheaper than GPT-4.1 Nano?›
No: $0.20 / $1.20 against $0.10 / $0.40, 157% more per token.
How does effort change the price?›
The price per token is the same at every effort. Higher effort spends more reasoning tokens: a task costs $0.01 at non-thinking, $0.01 at low, $0.016 at medium, $0.044 at high, $0.085 at xhigh, $0.18 at max.
What is a cheaper alternative to GPT-5.6 Luna?›
Agnes 2.5 Pro Beta costs -67% per task with a score +41% on Humanity's Last Exam.