Aion-3.0 vs GPT-5.2-Codex

Aion-3.0 at $3.45 in and $6.90 out and GPT-5.2-Codex at $2.01 in and $16.10 out — per million tokens, from the same wallet.

Aion-3.0

AionLabs

2.3¢

for a client proposal

$3.45 in · $6.90 out / 1M

131K context · released 1 month ago

Full page →

GPT-5.2-Codex

OpenAI

2.3¢

for a client proposal

$2.01 in · $16.10 out / 1M

400K context · released 7 months ago

Full page →

Asking all both at once — identical prompt, identical context — costs about 4.6¢ for a typical client proposal.

At a glance

Cheapest input: GPT-5.2-Codex at $2.01 per million tokens.
Cheapest output: Aion-3.0 at $6.90 per million tokens.
Largest context: GPT-5.2-Codex 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

Aion-3.0

1¢

GPT-5.2-Codex

1.2¢

Draft a client proposal from notes

5K in · 800 out

Aion-3.0

2.3¢

GPT-5.2-Codex

2.3¢

Context-heavy session (Alyph workspace)

155K in · 4K out

Aion-3.0

needs 155K ctx

GPT-5.2-Codex

$0.38

Analyze a 50-page legal contract

35K in · 1K out

Aion-3.0

$0.13

GPT-5.2-Codex

$0.09

Large architecture refactor

250K in · 3K out

Aion-3.0

needs 250K ctx

GPT-5.2-Codex

$0.55

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

Aion-3.0

GPT-5.2-Codex

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

Pricing

Aion-3.0

GPT-5.2-Codex

Input / 1M tokens

$3.45

$2.01

Output / 1M tokens

$6.90

$16.10

Cached input / 1M

$0.863

$0.201

Web search

—

1.1¢ / search

Specs

Aion-3.0

GPT-5.2-Codex

Provider

AionLabs

OpenAI

Released

1 month ago

7 months ago

Context window

131K

400K

Max output

33K

128K

Input

Text

Text and Images

Output

Text

Reasoning

Shows its thinking

Knowledge cutoff

—

Try it with real numbers

2K tokens in · 500 tokens out.

Aion-3.0

AionLabs

1¢

for this task

67% input · 33% output

Full pricing →

GPT-5.2-Codex

OpenAI

1.2¢

for this task

33% input · 67% 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 222 of these.

Which should you pick?

For long documents, GPT-5.2-Codex has the largest context window here — 400K tokens.

On price, Aion-3.0 is the cheapest of the two on a typical task, at about 2.3¢.

For images or files, GPT-5.2-Codex can read them directly; Aion-3.0 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 →

Aion-3.0 pricing →GPT-5.2-Codex pricing →Add Lyria 3 Clip Preview Add Grok 4.20

Questions, answered

Which is cheaper, Aion-3.0 or GPT-5.2-Codex?

On a typical client proposal (5K tokens in, 800 out): Aion-3.0 at 2.3¢; GPT-5.2-Codex at 2.3¢. Long prompts can change the order when long-context rates apply.

Which has the largest context window?

GPT-5.2-Codex — 400K tokens, about 570 pages.

Can I run Aion-3.0 and GPT-5.2-Codex 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 4.6¢ for a typical task.

Ask both at once

Identical prompt, identical context, answers side by side — about 4.6¢ for a typical client proposal. Free to start, with $5 of credit.