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gpt-5.6-terra vs gpt-5.6-luna

Pricing, Performance & Features Comparison

Authoropenai
Context Length1M
Reasoning
Providers1
ReleasedJul 2026
Knowledge CutoffFeb 2026
License

Mid tier of the GPT-5.6 family (Terra), balancing frontier reasoning quality against cost.

Input$2.5
Output$15
Latency (p50)4s
Output Limit128K
Function Calling
JSON Mode
-
InputText, Image
OutputText
in$2.5out$15cache$0.25
Latency (24h)
Success Rate (24h)
Authoropenai
Context Length1M
Reasoning
Providers1
ReleasedJul 2026
Knowledge CutoffFeb 2026
License

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
Latency (24h)
Success Rate (24h)