Google: Gemini 3.7 Flash vs OpenAI: GPT-5.6 Luna
On input price, OpenAI: GPT-5.6 Luna is ~1.9× cheaper. Verified 2026-08-23.
| Metric | Google: Gemini 3.7 Flash | OpenAI: GPT-5.6 Luna |
|---|---|---|
| Input / 1M | $0.375 | $0.200 |
| Output / 1M | $1.88 | $1.20 |
| Cache read / 1M | $0.037 | $0.020 |
| Context window | 1.0M | 1.1M |
| Max output | 66K | 128K |
Monthly cost by workload
| Workload | Google: Gemini 3.7 Flash | OpenAI: GPT-5.6 Luna | Cheaper |
|---|---|---|---|
| Chatbot | $10.50 | $6.40 | OpenAI: GPT-5.6 Luna |
| Coding agent | $33.75 | $20.00 | OpenAI: GPT-5.6 Luna |
| RAG pipeline | $73.13 | $42.00 | OpenAI: GPT-5.6 Luna |
Full details: Google: Gemini 3.7 Flash pricing · OpenAI: GPT-5.6 Luna pricing