Short answer: GPT-5.6 Luna is 19x cheaper (0.038¢ vs 0.71¢ a chat). GPT-5.6 Luna ranks higher overall (#11 vs #12). Claude Sonnet 5 wins at reasoning, coding, agentic tasks. GPT-5.6 Luna wins at maths. GPT-5.6 Luna is the better all-rounder for the money, but Claude Sonnet 5 is worth it if you mostly need reasoning, coding, agentic tasks.
AANTHROPICGANG
CLAUDE SONNET 5
ANTHROPIC GANG
CRAPGPT.LOLINDEPENDENT AI MODEL REVIEWS
CRAP SCORE543 SOURCES
THINKDEEPERWRITECLEANERBUILD SAFER
SAFERIDEASA MOREHUMANTOMORROW
POWER66EPOCH · AA · CRAPGPT
Writing
90
Reasoning
71
Agentic
69
Code
68
Math
58
Value
30
LIEUTENANT★★★★
GENERALIST / WRITER
0.71¢ per chat · 141 chats per NZ$1
“Ask me anything. Pay less.”
Every model is somebody.
— CRAPGPT.LOL —
OOPENAIGANG
GPT-5.6 LUNA
OPENAI GANG
CRAPGPT.LOLINDEPENDENT AI MODEL REVIEWS
CRAP SCORE703 SOURCES
INTELLIGENCEPEOPLETOOLSA BRIGHTERTOMORROW.
BETTERIDEASHIGHERPEOPLE
POWER66EPOCH · AA · CRAPGPT
Writing
54
Math
71
Code
67
Reasoning
66
Agentic
57
Value
78
SPECIALIST★★★★
WRITER / ANALYST
0.038¢ per chat · 2,638 chats per NZ$1
“Say it once. Say it right.”
Every model is somebody.
— CRAPGPT.LOL —
Claude Sonnet 5
GPT-5.6 Luna
Cost per chat (NZD)
0.71¢
0.038¢
Chats per NZ$1
141
2,638
Overall rank
#12
#11
Vendor
Anthropic
OpenAI
Speciality
General
Writing
Reasoning
71
66
Code
68
67
Math
58
71
Agentic
69
57
Scores are 0 to 100 percentiles blending LMArena, Epoch AI, Artificial Analysis and CrapGPT's own tests. Updated 2026-10-13.
FAQ
Which is cheaper, Claude Sonnet 5 or GPT-5.6 Luna?
GPT-5.6 Luna costs 0.038¢ per typical chat versus 0.71¢ for Claude Sonnet 5 on CrapGPT (NZD, measured token use).
Which is better, Claude Sonnet 5 or GPT-5.6 Luna?
GPT-5.6 Luna ranks higher overall on CrapGPT's blended benchmark score. By category: Claude Sonnet 5 leads at reasoning, coding, agentic tasks; GPT-5.6 Luna leads at maths.
Can I try Claude Sonnet 5 and GPT-5.6 Luna side by side?
Yes. CrapGPT's card battle sends one prompt to two models and lets you pick the winner, paying only for the two replies.
