Cogito v2.1 671B vs GPT-5.4 Mini

Cogito v2.1 671B at $1.44 in and $1.44 out and GPT-5.4 Mini at $0.863 in and $5.17 out — per million tokens, from the same wallet.

Cogito v2.1 671B

Deep Cogito

0.83¢

for a client proposal

$1.44 in · $1.44 out / 1M

128K context · released November 2025

Full page →

GPT-5.4 Mini

OpenAI

0.85¢

for a client proposal

$0.863 in · $5.17 out / 1M

400K context · released 5 months ago

Full page →

Asking all both at once — identical prompt, identical context — costs about 1.7¢ for a typical client proposal.

At a glance

Cheapest input: GPT-5.4 Mini at $0.863 per million tokens.
Cheapest output: Cogito v2.1 671B at $1.44 per million tokens.
Largest context: GPT-5.4 Mini at 400K tokens — about 570 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

Cogito v2.1 671B

0.36¢

GPT-5.4 Mini

0.43¢

Draft a client proposal from notes

5K in · 800 out

Cogito v2.1 671B

0.83¢

GPT-5.4 Mini

0.85¢

Context-heavy session (Alyph workspace)

155K in · 4K out

Cogito v2.1 671B

needs 155K ctx

GPT-5.4 Mini

$0.15

Analyze a 50-page legal contract

35K in · 1K out

Cogito v2.1 671B

$0.05

GPT-5.4 Mini

3.5¢

Large architecture refactor

250K in · 3K out

Cogito v2.1 671B

needs 250K ctx

GPT-5.4 Mini

$0.23

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

Cogito v2.1 671B

GPT-5.4 Mini

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

Pricing

Cogito v2.1 671B

GPT-5.4 Mini

Input / 1M tokens

$1.44

$0.863

Output / 1M tokens

$1.44

$5.17

Cached input / 1M

—

$0.086

Web search

—

1.1¢ / search

Specs

Cogito v2.1 671B

GPT-5.4 Mini

Provider

Deep Cogito

OpenAI

Released

November 2025

5 months ago

Context window

128K

400K

Max output

—

128K

Input

Text

Files, Images, and Text

Output

Text

Reasoning

Shows its thinking

Knowledge cutoff

—

2025-08-31

Try it with real numbers

2K tokens in · 500 tokens out.

Cogito v2.1 671B

Deep Cogito

0.36¢

for this task

80% input · 20% output

Full pricing →

GPT-5.4 Mini

OpenAI

0.43¢

for this task

40% input · 60% output

Full pricing →

All 2, same prompt and context: 0.79¢. That is the entire cost of the comparison.

Your $5 welcome credit covers about 632 of these.

Which should you pick?

For long documents, GPT-5.4 Mini has the largest context window here — 400K tokens.

On price, Cogito v2.1 671B is the cheapest of the two on a typical task, at about 0.83¢.

For images or files, GPT-5.4 Mini can read them directly; Cogito v2.1 671B is text-only.

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 →

Cogito v2.1 671B pricing →GPT-5.4 Mini pricing →Add Lyria 3 Clip Preview Add Grok 4.20

Questions, answered

Which is cheaper, Cogito v2.1 671B or GPT-5.4 Mini?

On a typical client proposal (5K tokens in, 800 out): Cogito v2.1 671B at 0.83¢; GPT-5.4 Mini at 0.85¢. Long prompts can change the order when long-context rates apply.

Which has the largest context window?

GPT-5.4 Mini — 400K tokens, about 570 pages.

Can I run Cogito v2.1 671B and GPT-5.4 Mini 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 1.7¢ for a typical task.

Ask both at once

Identical prompt, identical context, answers side by side — about 1.7¢ for a typical client proposal. Free to start, with $5 of credit.