tokevenClaudevsGPT
Claude Opus 4.8 vs GPT 5.6 Luna
Side-by-side comparison of pricing, task quality, and projected cost at higher scale.
Pricing
Side-by-side pricing
Claude Opus 4.8
FlagshipGPT 5.6 Luna
Fast / BudgetInput $/MTok
$5.00
$0.20
Output $/MTok
$25.00
$1.20
Cache discount
90% off
90% off
Context
1M
922K
Quality
Task confidence comparison
Confidence score from zero to one hundred by task type, where higher is better.
Code Generation
63
vs
62
Code Review
94
vs
68
Summarization
69
vs
57
Q&A
85
vs
85
Extraction
73
vs
74
Reasoning
89
vs
86
Classification
80
vs
91
Creative Writing
81
vs
69
Claude Opus 4.8
GPT 5.6 Luna
Guidance
When to use Claude Opus 4.8 vs GPT 5.6 Luna
Choose Claude Opus 4.8 when...
- -You need strong code review (confidence 94 vs 68)
- -You need strong reasoning (confidence 89 vs 86)
- -You need strong creative writing (confidence 81 vs 69)
- -You need strong summarization (confidence 69 vs 57)
- -You need a larger context window (1M vs 922K)
Choose GPT 5.6 Luna when...
- -You need strong classification (confidence 91 vs 80)
- -You need strong extraction (confidence 74 vs 73)
- -Cost matters: 96% cheaper on input tokens
At scale
Cost at scale
Estimated cost assuming a seventy percent input and thirty percent output token split.
Claude Opus 4.8
GPT 5.6 Luna
100K tokens
$1.10
$0.05Cheaper
1M tokens
$11.00
$0.82Cheaper
10M tokens
$110.00
$8.20Cheaper
FAQ
When should I use Claude Opus 4.8 instead of GPT 5.6 Luna?
Claude Opus 4.8 outperforms GPT 5.6 Luna for Code Generation, Code Review, Summarization. It costs $5.00/$25.00 per million tokens (input/output).
Is GPT 5.6 Luna cheaper than Claude Opus 4.8?
Yes. GPT 5.6 Luna input costs $0.20/MTok vs $5.00/MTok for Claude Opus 4.8, saving 96% on input.
What are the context window sizes for Claude Opus 4.8 and GPT 5.6 Luna?
Claude Opus 4.8 has a 1M token context window. GPT 5.6 Luna has a 922K token context window.
Go deeper on either model
Per-call cost calculators, provider lineups, and price history for both models on this page.
Other comparisons
How Claude Opus 4.8 and GPT 5.6 Luna stack up against the rest of the field.
Track your real costs
Comparisons show estimated costs at list price. The dashboard reveals your real spend and savings.