Calculator › Compare › GPT-6 Luna vs Gemini 3.8 Flash
✓ Prices checked against official pricing pages on October 19, 2026GPT-6 Luna vs Gemini 3.8 Flash: cost comparison
For a typical chatbot reply, GPT-6 Luna is 7.5× cheaper than Gemini 3.8 Flash ($0.35 vs $2.62 per 1,000 replies).
Scheduled price change: Gemini 3.8 Flash: Introductory price through Dec 31, 2026; $1.50 input / $7.50 output from Jan 1, 2027.
GPT-6 Luna OpenAI
$0.10input /1M
$0.01cached /1M
$0.50output /1M
- Prompts over 272,000 tokens are billed at $0.20 input / $0.02 cached / $0.75 output per 1M tokens for the whole request.
- Batch processing: 50% off input and output ($0.05 / $0.25 per 1M tokens).
Gemini 3.8 Flash Google
$0.75input /1M
$0.075cached /1M
$3.75output /1M
- Introductory price through Dec 31, 2026; $1.50 input / $7.50 output from Jan 1, 2027.
- Batch processing: 50% off input and output ($0.375 / $1.875 per 1M tokens).
Cost per 1,000 requests
| Workload | GPT-6 Luna | Gemini 3.8 Flash | Difference |
|---|---|---|---|
| Chatbot reply1,500 input / 400 output tokens | $0.35 | $2.62 | 7.5× |
| RAG answer8,000 input / 600 output tokens | $1.10 | $8.25 | 7.5× |
| Agent step30,000 input (80% cached) / 800 output | $1.24 | $9.30 | 7.5× |
| Summarize a long report60,000 input / 1,200 output tokens | $6.60 | $49.50 | 7.5× |
| Classify a ticket400 input / 10 output tokens | $0.045 | $0.337 | 7.5× |
Standard pricing, no batch discount. Price is only one factor; quality, speed, context length and rate limits matter too, so test both on your own prompts.
Run your own numbers in the calculator →
More comparisons
- GPT-6 Astra vs Claude Fable 5.1
- Claude Opus 5.5 vs GPT-6 Astra
- GPT-6.1 Sol vs Claude Sonnet 5.5
- GPT-6.1 Sol vs Gemini 4 Argon
- Claude Sonnet 5.5 vs Gemini 4 Argon
- Grok 4.7 vs GPT-6.1 Sol
- Grok 4.7 vs Claude Sonnet 5.5
- Gemini 4 Argon vs Grok 4.7
- GPT-6 Luna vs Claude Haiku 5.5
- Claude Haiku 5.5 vs Gemini 3.8 Flash
- DeepSeek V4 Pro vs GPT-6.1 Sol
- DeepSeek V4 Pro vs Claude Sonnet 5.5
- DeepSeek V4.1 Flash vs GPT-6 Luna