Gemini 2.5 Pro vs Gemini 3.6 Flash

Gemini 2.5 Pro at $1.44 in and $11.50 out and Gemini 3.6 Flash at $1.73 in and $8.63 out — per million tokens, from the same wallet.

Gemini 2.5 Pro

Google

1.6¢

for a client proposal

$1.44 in · $11.50 out / 1M

1.05M context · released June 2025

Full page →

Gemini 3.6 Flash

Google

1.6¢

for a client proposal

$1.73 in · $8.63 out / 1M

1.05M context · released 3 weeks ago

Full page →

Asking all both at once — identical prompt, identical context — costs about 3.2¢ for a typical client proposal.

At a glance

Cheapest input: Gemini 2.5 Pro at $1.44 per million tokens.
Cheapest output: Gemini 3.6 Flash at $8.63 per million tokens.
Identical context windows: 1.05M tokens each.

Cost per task

Estimated totals at the rates above. Solid bar is input, lighter bar is output.

Quick code fix

2K in · 500 out

Gemini 2.5 Pro

0.86¢

Gemini 3.6 Flash

0.78¢

Draft a client proposal from notes

5K in · 800 out

Gemini 2.5 Pro

1.6¢

Gemini 3.6 Flash

1.6¢

Context-heavy session (Alyph workspace)

155K in · 4K out

Gemini 2.5 Pro

$0.27

Gemini 3.6 Flash

$0.30

Analyze a 50-page legal contract

35K in · 1K out

Gemini 2.5 Pro

$0.06

Gemini 3.6 Flash

$0.07

Large architecture refactor

250K in · 3K out

Gemini 2.5 Pro

$0.77

Gemini 3.6 Flash

$0.46

Long-context rate applied at this input size.

Solid part of each bar is input tokens, the lighter part is output. Models that don’t fit a task are marked instead of priced.

Cost vs Token Amount

Drag the slider to adjust the split between input and output workload.

80% Input20% Output

Gemini 2.5 Pro

Gemini 3.6 Flash

Adjust the ratio slider to change how output tokens influence the final price for equivalent workloads.

Pricing

Gemini 2.5 Pro

Gemini 3.6 Flash

Input / 1M tokens

$1.44

$1.73

Output / 1M tokens

$11.50

$8.63

Cached input / 1M

$0.144

$0.172

Web search

1.6¢ / search

Specs

Gemini 2.5 Pro

Gemini 3.6 Flash

Provider

Google

Released

June 2025

3 weeks ago

Context window

1.05M

Max output

66K

Input

Text, Images, Files, Audio, and Video

Text, Images, Video, Files, and Audio

Output

Text

Reasoning

Shows its thinking

Knowledge cutoff

2025-01-31

—

Try it with real numbers

2K tokens in · 500 tokens out.

Gemini 2.5 Pro

Google

0.86¢

for this task

33% input · 67% output

Full pricing →

Gemini 3.6 Flash

Google

0.78¢

for this task

44% input · 56% output

Full pricing →

All 2, same prompt and context: 1.6¢. That is the entire cost of the comparison.

Your $5 welcome credit covers about 305 of these.

Which should you pick?

On price, Gemini 3.6 Flash is the cheapest of the two on a typical task, at about 1.6¢.

Or don’t pick. Send the identical prompt to all both, read the answers side by side, and keep the winner. How to run a fair bake-off →

Gemini 2.5 Pro pricing →Gemini 3.6 Flash pricing →Add Lyria 3 Clip Preview Add Grok 4.20

Questions, answered

Which is cheaper, Gemini 2.5 Pro or Gemini 3.6 Flash?

On a typical client proposal (5K tokens in, 800 out): Gemini 3.6 Flash at 1.6¢; Gemini 2.5 Pro at 1.6¢. Long prompts can change the order when long-context rates apply.

Which has the largest context window?

They are identical — 1.05M tokens each, about 1,500 pages.

Can I run Gemini 2.5 Pro and Gemini 3.6 Flash side by side on Alyph?

Yes — that is what Alyph is built for: the identical prompt with identical context to all 2, answers rendered side by side, billed from one wallet. This exact combination costs about 3.2¢ for a typical task.

Ask both at once

Identical prompt, identical context, answers side by side — about 3.2¢ for a typical client proposal. Free to start, with $5 of credit.