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GPT-5 nano OpenAI Legacy GPT-6 Luna OpenAI
Input $0.050 $0.10
Output $0.40 $0.50
Blended $0.14 $0.20
Context window 400k 1.05M
Max output 128k 128k
Output speed 136.4 121.6
Quality 56 58
Reasoning 38.6 38.5
Coding 22.6 54.6
Value 100 71.2
Vision ✓ ✓
Reasoning ✓ ✓
Tool calling ✓ ✓
Structured output ✓ ✓
Prompt caching ✓ ✓
Batch API ✓ ✓
Licence Proprietary Proprietary
API model id gpt-5-nano gpt-6-luna

At a glance

Input price, per million tokens
  1. GPT-5 nanoOpenAI$0.050
  2. GPT-6 LunaOpenAI$0.10
Output price, per million tokens
  1. GPT-5 nanoOpenAI$0.40
  2. GPT-6 LunaOpenAI$0.50
Context window
  1. GPT-5 nanoOpenAI400k
  2. GPT-6 LunaOpenAI1.05M

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