LLMCost

Google: Gemini 3.5 Flash Lite vs OpenAI: GPT-5.6 Terra Pro

On input price, Google: Gemini 3.5 Flash Lite is ~6.7× cheaper. Verified 2026-10-21.

Google: Gemini 3.5 Flash Lite $0.300/$2.50vsOpenAI: GPT-5.6 Terra Pro $2.00/$12.00

Verdict

On blended price (3:1 input:output), Google: Gemini 3.5 Flash Lite is ~5.3× cheaper ($0.300/$2.50 vs $2.00/$12.00 per 1M tokens). OpenAI: GPT-5.6 Terra Pro scores higher on intelligence (57 vs 37, Artificial Analysis) — pay more only if that gap matters for your workload.

Pricing

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

MetricGoogle: Gemini 3.5 Flash LiteOpenAI: GPT-5.6 Terra Pro
Input / 1M$0.300$2.00
Output / 1M$2.50$12.00
Cache read / 1M$0.030$0.200
Blended (3:1)$0.850/1M$4.50/1M
Estimated monthly costGoogle: Gemini 3.5 Flash LiteOpenAI: GPT-5.6 Terra Pro
Chatbot10,000 reqs · 800/400 tok$12.40$64.00
Coding agent5,000 reqs · 8000/2000 tok$37.00$200.00
RAG pipeline30,000 reqs · 4000/500 tok$73.50$420.00

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

Specifications & capabilities

MetricGoogle: Gemini 3.5 Flash LiteOpenAI: GPT-5.6 Terra Pro
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 3.5 Flash Lite37
OpenAI: GPT-5.6 Terra Pro57

Sources: Google: Gemini 3.5 Flash Lite on Artificial Analysis · OpenAI: GPT-5.6 Terra Pro on Artificial Analysis

Performance

Measured by Artificial Analysis on live endpoints.

Output speed — higher is better
Google: Gemini 3.5 Flash Lite220 tok/s
OpenAI: GPT-5.6 Terra Pro80 tok/s
Latency (TTFT) — lower is better
Google: Gemini 3.5 Flash Lite400 ms
OpenAI: GPT-5.6 Terra Pro1,300 ms
MetricGoogle: Gemini 3.5 Flash LiteOpenAI: GPT-5.6 Terra Pro
Cost per task$0.000002$0.000016

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 3.5 Flash Lite pricing · OpenAI: GPT-5.6 Terra Pro pricing