GPT-5.6 Luna pricing & specs
OpenAI · released 2026-07-09 · ● verified 2026-10-11
input / 1M$0.20
output / 1M$1.20
context1.05M
max output128K
// price history ($/1M tokens)
// cheaper or similar alternatives
| model | in | out | ctx | vs GPT-5.6 Luna |
|---|---|---|---|---|
| Gemini 2.5 Flash-Lite | $0.10 | $0.40 | 1.05M | −61.1% |
| Claude Haiku 5.5 | $0.10 | $0.50 | 1M | −55.6% |
| GPT-6 Luna | $0.10 | $0.50 | 1.05M | −55.6% |
| GLM-5.3-Flash | $0.15 | $0.50 | 1M | −47.2% |
| Gemini 3.1 Flash Lite | $0.25 | $1.50 | 1.05M | +25% |
// price by host
| host | in $/1M | out $/1M |
|---|---|---|
| Amazon Bedrock | $0.20 | $1.20 |
| Azure | $0.20 | $1.20 |
// faq
How much does GPT-5.6 Luna cost?
GPT-5.6 Luna costs $0.20 per million input tokens and $1.20 per million output tokens. At 50M input and 10M output tokens per month that is about $22.00. Prompts above 272K tokens are billed at $0.40 input and $1.80 output.
What is the context window of GPT-5.6 Luna?
1.05M tokens, with up to 128K output tokens per request.
Does GPT-5.6 Luna support prompt caching?
Yes. Cached input tokens cost $0.02 per million and cache writes cost $0.25 per million.
What are cheaper alternatives to GPT-5.6 Luna?
Gemini 2.5 Flash-Lite ($0.10 in / $0.40 out), Claude Haiku 5.5 ($0.10 in / $0.50 out), GPT-6 Luna ($0.10 in / $0.50 out) offer the same input types and capabilities for less.
// spec sheet
- input / 1M
- $0.20
- output / 1M
- $1.20
- cache read / 1M
- $0.02
- cache write / 1M
- $0.25
- > 272K ctx
- $0.40 / $1.80
- blended (3:1)
- $0.45
- context
- 1.05M
- max output
- 128K
- input types
- text · image · pdf
- reasoning
- yes
- tool calling
- yes
- structured output
- yes
- open weights
- no
- knowledge cutoff
- 2026-02-16
- price source
- OpenAI
// cost calculator
| model | in $/1M | out $/1M | = monthly |
|---|---|---|---|
| Gemini 2.5 Flash-Lite | $0.10 | $0.40 | $9.00 |
| Claude Haiku 5.5 | $0.10 | $0.50 | $10.00 |
| GPT-6 Luna | $0.10 | $0.50 | $10.00 |
| GPT-5.6 Luna | $0.20 | $1.20 | $22.00 |
Base-tier list prices. Long-context tiers, caching and batch discounts are not included.