grok-4.5 vs gpt-5.6-luna
Pricing, Performance & Features Comparison
xAI’s flagship reasoning model with configurable reasoning effort.
Input$2
Output$6
Latency (p50)5.2s
Output Limit–
Function Calling
JSON Mode
-
InputText, Image
OutputText
in$2out$6cache$0.5–
Latency (24h)
Success Rate (24h)
Small tier of the GPT-5.6 family (Luna), the fastest and most cost-efficient GPT-5.6 model.
Input$1
Output$6
Latency (p50)4.1s
Output Limit128K
Function Calling
JSON Mode
-
InputText, Image
OutputText
in$1out$6cache$0.1–