Claude Sonnet 5 vs Gemini 3.1 Pro Preview

Claude Sonnet 5 at $2.30 in and $11.50 out and Gemini 3.1 Pro Preview at $2.30 in and $13.80 out — per million tokens, from the same wallet.

Claude Sonnet 5

Anthropic

2.1¢

for a client proposal

$2.30 in · $11.50 out / 1M

1M context · released 1 month ago

Full page →

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 →

Asking all both at once — identical prompt, identical context — costs about 4.3¢ for a typical client proposal.

At a glance

All 2 cost the same on input.
Cheapest output: Claude Sonnet 5 at $11.50 per million tokens.
Largest context: Gemini 3.1 Pro Preview at 1.05M tokens — about 1,500 pages.

Cost per task

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

Quick code fix

2K in · 500 out

Claude Sonnet 5

1¢

Gemini 3.1 Pro Preview

1.1¢

Draft a client proposal from notes

5K in · 800 out

Claude Sonnet 5

2.1¢

Gemini 3.1 Pro Preview

2.3¢

Context-heavy session (Alyph workspace)

155K in · 4K out

Claude Sonnet 5

$0.40

Gemini 3.1 Pro Preview

$0.41

Analyze a 50-page legal contract

35K in · 1K out

Claude Sonnet 5

$0.09

Gemini 3.1 Pro Preview

$0.09

Large architecture refactor

250K in · 3K out

Claude Sonnet 5

$0.61

Gemini 3.1 Pro Preview

$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

Claude Sonnet 5

Gemini 3.1 Pro Preview

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

Pricing

Claude Sonnet 5

Gemini 3.1 Pro Preview

Input / 1M tokens

$2.30

Output / 1M tokens

$11.50

$13.80

Cached input / 1M

$0.230

Web search

1.1¢ / search

1.6¢ / search

Specs

Claude Sonnet 5

Gemini 3.1 Pro Preview

Provider

Anthropic

Google

Released

1 month ago

6 months ago

Context window

1.05M

Max output

128K

66K

Input

Text, Images, and Files

Audio, Files, Images, Text, and Video

Output

Text

Reasoning

Shows its thinking

Knowledge cutoff

—

Try it with real numbers

2K tokens in · 500 tokens out.

Claude Sonnet 5

Anthropic

1¢

for this task

44% input · 56% output

Full pricing →

Gemini 3.1 Pro Preview

Google

1.1¢

for this task

40% input · 60% output

Full pricing →

All 2, same prompt and context: 2.2¢. That is the entire cost of the comparison.

Your $5 welcome credit covers about 228 of these.

Which should you pick?

For long documents, Gemini 3.1 Pro Preview has the largest context window here — 1.05M tokens.

On price, Claude Sonnet 5 is the cheapest of the two on a typical task, at about 2.1¢.

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 →

Claude Sonnet 5 pricing →Gemini 3.1 Pro Preview pricing →Add Lyria 3 Clip Preview Add Grok 4.20

Questions, answered

Which is cheaper, Claude Sonnet 5 or Gemini 3.1 Pro Preview?

On a typical client proposal (5K tokens in, 800 out): Claude Sonnet 5 at 2.1¢; Gemini 3.1 Pro Preview at 2.3¢. Long prompts can change the order when long-context rates apply.

Which has the largest context window?

Gemini 3.1 Pro Preview — 1.05M tokens, about 1,500 pages.

Can I run Claude Sonnet 5 and Gemini 3.1 Pro Preview 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 4.3¢ for a typical task.

Ask both at once

Identical prompt, identical context, answers side by side — about 4.3¢ for a typical client proposal. Free to start, with $5 of credit.