GPT 5.6 Luna
GPT 5.6 Luna is the fast, low-cost model of the GPT-5.6 family, holding strong capability at the lowest price in the series while sharing the family's agentic gains in coding, biology, and cybersecurity and a context window of 1.1M tokens. Your use is subject to OpenAI's Terms & Privacy Policies.
ReasoningFile InputTool UseVision (Image)Implicit CachingWeb SearchHas Fast ModeWebsockets
import { streamText } from 'ai'
const result = streamText({ model: 'openai/gpt-5.6-luna', prompt: 'Why is the sky blue?'})Copy link to headingMore models by OpenAI
| Model |
|---|
| 1.1M | 3.5s | 92tps | $5/M+1 more | $30/M+1 more | Read: $0.5/M+1 more Write: $6.25/M+1 more | $10/K + input costs | +4 |    | 07/09/2026 | ||||
| 1.1M | 1.4s | 135tps | $2.50/M$2/M +1 more | $15/M$12/M +1 more | Read: $0.25/M$0.2/M+1 more Write: $3.13/M$2.5/M+1 more | $10/K + input costs | +4 | | 07/09/2026 | ||||
| 1.1M | 0.8s | 114tps | $2.50/M+1 more | $15/M+1 more | Read: $0.25/M+1 more Write: — | $10/K + input costs | +4 | | 03/05/2026 | ||||
| 400K | 5.3s | 119tps | $0.05/M | $0.40/M | Read:$0.01/M Write:— | $14/K + input costs | +3 | | 08/07/2025 | ||||
| 400K | 3.0s | 167tps | $0.25/M | $2/M | Read:$0.03/M Write:— | $14/K + input costs | +3 | | 08/07/2025 | ||||
| 131K | 0.2s | 408tps | $0.35/M | $0.75/M | Read:$0.25/M Write:— | — |   +5 | 08/05/2025 |