GPTvsGemini

GPT 5.6 Luna vs Gemini 3.5 Flash-Lite

Side-by-side comparison of pricing, task quality, and projected cost at higher scale.

Pricing

Side-by-side pricing

GPT 5.6 Luna

Fast / Budget

Gemini 3.5 Flash-Lite

Fast / Budget
Input $/MTok
$0.20
$0.30
Output $/MTok
$1.20
$2.50
Cache discount
90% off
90% off
Context
922K
1.0M

Quality

Task confidence comparison

Confidence score from zero to one hundred by task type, where higher is better.
Code Generation
62
vs
58
Code Review
68
vs
52
Summarization
57
vs
67
Q&A
85
vs
78
Extraction
74
vs
69
Reasoning
86
vs
60
Classification
91
vs
85
Creative Writing
69
vs
67
GPT 5.6 Luna
Gemini 3.5 Flash-Lite

Guidance

When to use GPT 5.6 Luna vs Gemini 3.5 Flash-Lite

Choose GPT 5.6 Luna when...

  • -You need strong classification (confidence 91 vs 85)
  • -You need strong reasoning (confidence 86 vs 60)
  • -You need strong q&a (confidence 85 vs 78)
  • -You need strong extraction (confidence 74 vs 69)
  • -Cost matters: 33% cheaper on input tokens

Choose Gemini 3.5 Flash-Lite when...

  • -You need strong summarization (confidence 67 vs 57)
  • -You need a larger context window (1.0M vs 922K)

At scale

Cost at scale

Estimated cost assuming a seventy percent input and thirty percent output token split.
GPT 5.6 Luna
Gemini 3.5 Flash-Lite
100K tokens
$0.05Cheaper
$0.10
1M tokens
$0.82Cheaper
$0.96
10M tokens
$8.20Cheaper
$9.60

FAQ

When should I use GPT 5.6 Luna instead of Gemini 3.5 Flash-Lite?

GPT 5.6 Luna outperforms Gemini 3.5 Flash-Lite for Code Generation, Code Review, Q&A. It costs $0.20/$1.20 per million tokens (input/output).

Is Gemini 3.5 Flash-Lite cheaper than GPT 5.6 Luna?

Gemini 3.5 Flash-Lite input costs $0.30/MTok, which is 50% more than GPT 5.6 Luna at $0.20/MTok.

What are the context window sizes for GPT 5.6 Luna and Gemini 3.5 Flash-Lite?

GPT 5.6 Luna has a 922K token context window. Gemini 3.5 Flash-Lite has a 1.0M token context window.

Track your real costs

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