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GPT-5.4 nano OpenAI Deprecated GPT-5.6 Luna OpenAI
Input $0.20 $0.20
Output $1.25 $1.20
Blended $0.46 $0.45
Context window 400k 1.05M
Max output 128k 128k
Output speed 161.2 123.9
Quality 49 57.5
Reasoning 55 65.3
Coding 53.9 53.6
Value 26 31.3
Vision ✓ ✓
Reasoning ✓ ✓
Tool calling ✓ ✓
Structured output ✓ ✓
Prompt caching ✓ ✓
Batch API ✓ ✓
Licence Proprietary Proprietary
API model id gpt-5.4-nano gpt-5.6-luna

At a glance

Input price, per million tokens
  1. GPT-5.4 nanoOpenAI$0.20
  2. GPT-5.6 LunaOpenAI$0.20
Output price, per million tokens
  1. GPT-5.4 nanoOpenAI$1.25
  2. GPT-5.6 LunaOpenAI$1.20
Context window
  1. GPT-5.4 nanoOpenAI400k
  2. GPT-5.6 LunaOpenAI1.05M

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Language models 77
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Voice and realtime 17
Embeddings 3