gpt-5.6-luna vs claude-sonnet-5
Pricing, Performance & Features Comparison
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
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InputText, Image
OutputText
in$1out$6cache$0.1–
Latency (24h)
Success Rate (24h)
Near-Opus quality on coding and agentic work at Sonnet cost; adaptive thinking is on by default and non-default sampling parameters are rejected.
Input$3
Output$15
Latency (p50)5.6s
Output Limit128K
Function Calling
JSON Mode
InputText, Image
OutputText
in$3out$15cache$0.3write$3.8