Claude Haiku 4.5 vs o4 Mini

Claude Haiku 4.5 at $1.15 in and $5.75 out and o4 Mini at $1.26 in and $5.06 out — per million tokens, from the same wallet.

Claude Haiku 4.5

Anthropic

1¢

for a client proposal

$1.15 in · $5.75 out / 1M

200K context · released October 2025

Full page →

o4 Mini

OpenAI

1¢

for a client proposal

$1.26 in · $5.06 out / 1M

200K context · released April 2025

Full page →

Asking all both at once — identical prompt, identical context — costs about 2.1¢ for a typical client proposal.

At a glance

Cheapest input: Claude Haiku 4.5 at $1.15 per million tokens.
Cheapest output: o4 Mini at $5.06 per million tokens.
Identical context windows: 200K 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

Claude Haiku 4.5

0.52¢

o4 Mini

0.51¢

Draft a client proposal from notes

5K in · 800 out

Claude Haiku 4.5

1¢

o4 Mini

1¢

Context-heavy session (Alyph workspace)

155K in · 4K out

Claude Haiku 4.5

$0.20

o4 Mini

$0.22

Analyze a 50-page legal contract

35K in · 1K out

Claude Haiku 4.5

4.6¢

o4 Mini

4.9¢

Large architecture refactor

250K in · 3K out

Claude Haiku 4.5

needs 250K ctx

o4 Mini

needs 250K ctx

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 Haiku 4.5

o4 Mini

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

Pricing

Claude Haiku 4.5

o4 Mini

Input / 1M tokens

$1.15

$1.26

Output / 1M tokens

$5.75

$5.06

Cached input / 1M

$0.115

$0.316

Web search

1.1¢ / search

Specs

Claude Haiku 4.5

o4 Mini

Provider

Anthropic

OpenAI

Released

October 2025

April 2025

Context window

200K

Max output

64K

100K

Input

Text, Images, and Files

Images, Text, and Files

Output

Text

Reasoning

Shows its thinking

Knowledge cutoff

—

2024-06-30

Try it with real numbers

2K tokens in · 500 tokens out.

Claude Haiku 4.5

Anthropic

0.52¢

for this task

44% input · 56% output

Full pricing →

o4 Mini

OpenAI

0.51¢

for this task

50% input · 50% output

Full pricing →

All 2, same prompt and context: 1¢. That is the entire cost of the comparison.

Your $5 welcome credit covers about 488 of these.

Which should you pick?

On price, Claude Haiku 4.5 is the cheapest of the two on a typical task, at about 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 Haiku 4.5 pricing →o4 Mini pricing →Add Lyria 3 Clip Preview Add Grok 4.20

Questions, answered

Which is cheaper, Claude Haiku 4.5 or o4 Mini?

On a typical client proposal (5K tokens in, 800 out): Claude Haiku 4.5 at 1¢; o4 Mini at 1¢. Long prompts can change the order when long-context rates apply.

Which has the largest context window?

They are identical — 200K tokens each, about 290 pages.

Can I run Claude Haiku 4.5 and o4 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 2.1¢ for a typical task.

Ask both at once

Identical prompt, identical context, answers side by side — about 2.1¢ for a typical client proposal. Free to start, with $5 of credit.