Gemini 3.1 Pro Preview vs Gemini 3.1 Pro Preview Custom Tools

Gemini 3.1 Pro Preview at $2.30 in and $13.80 out and Gemini 3.1 Pro Preview Custom Tools at $2.30 in and $13.80 out — per million tokens, from the same wallet.

Gemini 3.1 Pro Preview

Google

2.3¢

for a client proposal

$2.30 in · $13.80 out / 1M

1.05M context · released 6 months ago

Full page →

Gemini 3.1 Pro Preview Custom Tools

Google

2.3¢

for a client proposal

$2.30 in · $13.80 out / 1M

1.05M context · released 5 months ago

Full page →

Asking all both at once — identical prompt, identical context — costs about 4.5¢ for a typical client proposal.

At a glance

All 2 cost the same on input.
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 3.1 Pro Preview

1.1¢

Gemini 3.1 Pro Preview Custom Tools

1.1¢

Draft a client proposal from notes

5K in · 800 out

Gemini 3.1 Pro Preview

2.3¢

Gemini 3.1 Pro Preview Custom Tools

2.3¢

Context-heavy session (Alyph workspace)

155K in · 4K out

Gemini 3.1 Pro Preview

$0.41

Gemini 3.1 Pro Preview Custom Tools

$0.41

Analyze a 50-page legal contract

35K in · 1K out

Gemini 3.1 Pro Preview

$0.09

Gemini 3.1 Pro Preview Custom Tools

$0.09

Large architecture refactor

250K in · 3K out

Gemini 3.1 Pro Preview

$1.21

Gemini 3.1 Pro Preview Custom Tools

$1.21

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 3.1 Pro Preview

Gemini 3.1 Pro Preview Custom Tools

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

Pricing

Gemini 3.1 Pro Preview

Gemini 3.1 Pro Preview Custom Tools

Input / 1M tokens

$2.30

Output / 1M tokens

$13.80

Cached input / 1M

$0.230

Web search

1.6¢ / search

Specs

Gemini 3.1 Pro Preview

Gemini 3.1 Pro Preview Custom Tools

Provider

Google

Released

6 months ago

5 months ago

Context window

1.05M

Max output

66K

Input

Audio, Files, Images, Text, and Video

Text, Audio, Images, Video, and Files

Output

Text

Reasoning

Shows its thinking

Knowledge cutoff

—

Try it with real numbers

2K tokens in · 500 tokens out.

Gemini 3.1 Pro Preview

Google

1.1¢

for this task

40% input · 60% output

Full pricing →

Gemini 3.1 Pro Preview Custom Tools

Google

1.1¢

for this task

40% input · 60% output

Full pricing →

All 2, same prompt and context: 2.3¢. That is the entire cost of the comparison.

Your $5 welcome credit covers about 217 of these.

Which should you pick?

On price they are identical: about 2.3¢ for a typical task each.

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 3.1 Pro Preview pricing →Gemini 3.1 Pro Preview Custom Tools pricing →Add Lyria 3 Clip Preview Add Grok 4.20

Questions, answered

Which is cheaper, Gemini 3.1 Pro Preview or Gemini 3.1 Pro Preview Custom Tools?

On a typical client proposal (5K tokens in, 800 out) they cost the same — about 2.3¢ each. Compare them on context and capabilities instead.

Which has the largest context window?

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

Can I run Gemini 3.1 Pro Preview and Gemini 3.1 Pro Preview Custom Tools 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 4.5¢ for a typical task.

Ask both at once

Identical prompt, identical context, answers side by side — about 4.5¢ for a typical client proposal. Free to start, with $5 of credit.