Gemini 2.5 Flash vs Gemini 2.5 Pro

Name: Gemini 2.5 Pro
Brand: Google Vertex AI
Price: 1.250000 USD

Gemini 2.5 Flash vs Gemini 2.5 Pro: Gemini 2.5 Flash is cheaper by 76% on average. Gemini 2.5 Flash from Google Vertex AI (1,048,576-token context, reasoning, tool calls) vs. Gemini 2.5 Pro from Google Vertex AI (1,048,576-token context, reasoning, tool calls). Use Agent Command Center to A/B both in shadow mode and pick the winner per workload.

Side-by-side cost

Live workload comparison

Same workload run through both models. The cheaper one is highlighted.

Input tokens / request3,000

01,048,576

Output tokens / request400

065,535

Requests / day5,000

01,000,000

Gemini 2.5 FlashCheaper

Google Vertex AI

$289/mo

Input $0.300/M · Output $2.50/M

Gemini 2.5 Pro

Google Vertex AI

$1,179/mo

Input $1.25/M · Output $10.00/M

At this workload, Gemini 2.5 Flash is 75% cheaper than Gemini 2.5 Pro — a savings of $890/month ($10,684/year).

Production recipe — Agent Command Center

strategy: cost-optimized
primary:
  model: gemini-2-5-flash
  provider: vertex-ai
fallback:
  model: gemini-2-5-pro
  provider: vertex-ai
shadow: { sample_rate: 0.05 }   # mirror 5% of traffic to compare quality live

Get started free →Routing docs ↗

	Gemini 2.5 Flash Google Vertex AI	Gemini 2.5 Pro Google Vertex AI
Input price	$0.300/M	$1.25/M
Output price	$2.50/M	$10.00/M
Context window	1,048,576	1,048,576
Max output	65,535	65,535
Function calling	✓	✓
Vision	✓	✓
Audio input	—	✓
Reasoning	✓	✓
Prompt caching	✓	✓
Structured output	✓	✓
Pricing verified	May 12, 2026	May 12, 2026