GPT-5.6 Luna Pricing
OpenAI · GPT-5.6 · Live
GPT-5.6 Luna costs $0.2 per million input tokens and $1.2 per million output tokens on the OpenAI API. Cached input reads are billed at $0.02 per million tokens. It supports a 1,048,576-token context window and up to 128,000 output tokens per request. The model supports image input, tool use, long context. Released July 9, 2026. Pricing verified September 14, 2026.
GPT-5.6 Luna API pricing
GPT-5.6 Luna API pricing is $0.2 per million input tokens and $1.2 per million output tokens, verified September 14, 2026.
- Input (per 1M tokens)
- $0.2
- Output (per 1M tokens)
- $1.2
- Cached input (per 1M tokens)
- $0.02
- Batch discount
- 50%
- Context window
- 1,048,576 tokens
- Max output
- 128,000 tokens
- Released
- July 9, 2026
Capabilities
GPT-5.6 Luna supports image input, tool use, long context.
Price history
See full GPT-5.6 Luna price historyGPT-5.6 Luna API pricing has changed 1 time on record, most recently on July 30, 2026 (decrease).
- July 30, 2026: Decrease — input $1 → $0.2/M (−$0.8) — output $6 → $1.2/M (−$4.8)
Frequently asked questions
Short answers to the most common questions about GPT-5.6 Luna pricing, limits, and capabilities.
Notes
2026-07-30: 80% API price cut announced. Input $1.00 → $0.20, Output $6.00 → $1.20, Cache Read $0.10 → $0.02 (following OpenAI's standard ~10% cache-of-input pricing). Vendor did not change Sol (flagship) pricing. Source: unite.ai/openai-cuts-api-prices-on-its-two-cheaper-gpt-5-6-tiers/, aipricing.guru/openai-pricing/. Context: competitive pressure from Chinese open-source models (as reported by CNBC July 30). OpenAI also added Fast Mode (2x speed, premium priced) on the same day.