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Claude Sonnet 4.6 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 Sonnet 4.6

Mid-tier

GPT 5.6 Luna

Fast / Budget
Input $/MTok
$3.00
$1.00
Output $/MTok
$15.00
$6.00
Cache discount
90% off
90% off
Context
200K
1,000K

Quality

Task confidence comparison

Confidence score from zero to one hundred by task type, where higher is better.
Code Generation
92
vs
70
Code Review
95
vs
68
Summarization
90
vs
84
Q&A
88
vs
85
Extraction
86
vs
89
Reasoning
88
vs
63
Classification
84
vs
91
Creative Writing
85
vs
58
Claude Sonnet 4.6
GPT 5.6 Luna

Guidance

When to use Claude Sonnet 4.6 vs GPT 5.6 Luna

Choose Claude Sonnet 4.6 when...

  • -You need strong code review (confidence 95 vs 68)
  • -You need strong code generation (confidence 92 vs 70)
  • -You need strong summarization (confidence 90 vs 84)
  • -You need strong reasoning (confidence 88 vs 63)

Choose GPT 5.6 Luna when...

  • -You need strong classification (confidence 91 vs 84)
  • -You need strong extraction (confidence 89 vs 86)
  • -Cost matters: 67% cheaper on input tokens
  • -You need a larger context window (1,000K vs 200K)

At scale

Cost at scale

Estimated cost assuming a seventy percent input and thirty percent output token split.
Claude Sonnet 4.6
GPT 5.6 Luna
100K tokens
$0.66
$0.25Cheaper
1M tokens
$6.60
$2.50Cheaper
10M tokens
$66.00
$25.00Cheaper

FAQ

When should I use Claude Sonnet 4.6 instead of GPT 5.6 Luna?

Claude Sonnet 4.6 outperforms GPT 5.6 Luna for Code Generation, Code Review, Reasoning. It costs $3.00/$15.00 per million tokens (input/output).

Is GPT 5.6 Luna cheaper than Claude Sonnet 4.6?

Yes. GPT 5.6 Luna input costs $1.00/MTok vs $3.00/MTok for Claude Sonnet 4.6, saving 67% on input.

What are the context window sizes for Claude Sonnet 4.6 and GPT 5.6 Luna?

Claude Sonnet 4.6 has a 200K token context window. GPT 5.6 Luna has a 1,000K token context window.

Track your real costs

Comparisons show estimated costs at list price. The dashboard reveals your real spend and savings.

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