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Google: Gemini 3.7 Flash vs OpenAI: GPT-5.6 Luna

On input price, OpenAI: GPT-5.6 Luna is ~3.8× cheaper. Verified 2026-10-21.

Google: Gemini 3.7 Flash $0.750/$3.75vsOpenAI: GPT-5.6 Luna $0.200/$1.20

Verdict

On blended price (3:1 input:output), OpenAI: GPT-5.6 Luna is ~3.3× cheaper ($0.200/$1.20 vs $0.750/$3.75 per 1M tokens). Google: Gemini 3.7 Flash scores higher on intelligence (56 vs 52, Artificial Analysis) — pay more only if that gap matters for your workload. Google: Gemini 3.7 Flash generates 13% faster output.

Pricing

Per-million-token list prices, verified 2026-10-21. Green marks the better value.

MetricGoogle: Gemini 3.7 FlashOpenAI: GPT-5.6 Luna
Input / 1M$0.750$0.200
Output / 1M$3.75$1.20
Cache read / 1M$0.075$0.020
Blended (3:1)$1.50/1M$0.450/1M
Estimated monthly costGoogle: Gemini 3.7 FlashOpenAI: GPT-5.6 Luna
Chatbot10,000 reqs · 800/400 tok$21.00$6.40
Coding agent5,000 reqs · 8000/2000 tok$67.50$20.00
RAG pipeline30,000 reqs · 4000/500 tok$146.25$42.00

Plug in your own numbers in the calculator, or paste a real bill into the Bill Shredder.

Specifications & capabilities

MetricGoogle: Gemini 3.7 FlashOpenAI: GPT-5.6 Luna
Context window1.0M1.1M
Max output66K128K
Vision input✓✓
Tool calling✓✓
Reasoning✓✓

Quality

Intelligence Index by Artificial Analysis (independent evaluations, 0–100).

Intelligence Index — higher is better
Google: Gemini 3.7 Flash56
OpenAI: GPT-5.6 Luna52

Sources: Google: Gemini 3.7 Flash on Artificial Analysis · OpenAI: GPT-5.6 Luna on Artificial Analysis

Performance

Measured by Artificial Analysis on live endpoints.

Output speed — higher is better
Google: Gemini 3.7 Flash180 tok/s
OpenAI: GPT-5.6 Luna160 tok/s
Latency (TTFT) — lower is better
Google: Gemini 3.7 Flash500 ms
OpenAI: GPT-5.6 Luna550 ms
MetricGoogle: Gemini 3.7 FlashOpenAI: GPT-5.6 Luna
Cost per task$0.000004$0.000005

Provider

Infrastructure metrics for the organizations behind these models.

MetricGoogleOpenAI
Listed endpoints1512
Reliability99.7%99.9%
Avg latency380 ms450 ms
Pricing tiersstandard, batchstandard, batch, provisioned

Full details: Google: Gemini 3.7 Flash pricing · OpenAI: GPT-5.6 Luna pricing