Claude Opus 4 vs o1 vs Grok 4.20

Claude Opus 4 at $17.25 in and $86.25 out, o1 at $17.25 in and $69.00 out, and Grok 4.20 at $1.44 in and $2.88 out — per million tokens, from the same wallet.

Claude Opus 4

Anthropic

$0.16

for a client proposal

$17.25 in · $86.25 out / 1M

200K context · released May 2025

Full page →

OpenAI

$0.14

for a client proposal

$17.25 in · $69.00 out / 1M

200K context · released December 2024

Full page →

Grok 4.20

xAI

0.95¢

for a client proposal

$1.44 in · $2.88 out / 1M

2M context · released 4 months ago

Full page →

Asking all three at once — identical prompt, identical context — costs about $0.31 for a typical client proposal.

At a glance

Cheapest input: Grok 4.20 at $1.44 per million tokens.
Cheapest output: Grok 4.20 at $2.88 per million tokens.
Largest context: Grok 4.20 at 2M tokens — about 2,900 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 Opus 4

$0.08

$0.07

Grok 4.20

0.43¢

Draft a client proposal from notes

5K in · 800 out

Claude Opus 4

$0.16

$0.14

Grok 4.20

0.95¢

Context-heavy session (Alyph workspace)

155K in · 4K out

Claude Opus 4

$3.02

$2.95

Grok 4.20

$0.23

Analyze a 50-page legal contract

35K in · 1K out

Claude Opus 4

$0.69

$0.67

Grok 4.20

$0.05

Large architecture refactor

250K in · 3K out

Claude Opus 4

needs 250K ctx

Grok 4.20

$0.74

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 Opus 4

Grok 4.20

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

Pricing

Claude Opus 4

Grok 4.20

Input / 1M tokens

$17.25

$1.44

Output / 1M tokens

$86.25

$69.00

$2.88

Cached input / 1M

$1.73

$8.63

$0.230

Web search

1.1¢ / search

0.57¢ / search

Specs

Claude Opus 4

Grok 4.20

Provider

Anthropic

OpenAI

xAI

Released

May 2025

December 2024

4 months ago

Context window

200K

Max output

32K

100K

—

Input

Images, Text, and Files

Text, Images, and Files

Output

Text

Reasoning

Shows its thinking

Knowledge cutoff

2025-01-31

2023-10-31

2025-09-01

Try it with real numbers

2K tokens in · 500 tokens out.

Claude Opus 4

Anthropic

$0.08

for this task

44% input · 56% output

Full pricing →

OpenAI

$0.07

for this task

50% input · 50% output

Full pricing →

Grok 4.20

xAI

0.43¢

for this task

67% input · 33% output

Full pricing →

All 3, same prompt and context: $0.15. That is the entire cost of the comparison.

Your $5 welcome credit covers about 33 of these.

Which should you pick?

For long documents, Grok 4.20 has the largest context window here — 2M tokens.

On price, Grok 4.20 is the cheapest of the three on a typical task, at about 0.95¢.

Or don’t pick. Send the identical prompt to all three, read the answers side by side, and keep the winner. How to run a fair bake-off →

Claude Opus 4 pricing →o1 pricing →Grok 4.20 pricing →Try other combinations →

Questions, answered

Which is cheapest — Claude Opus 4, o1, or Grok 4.20?

On a typical client proposal (5K tokens in, 800 out): Grok 4.20 at 0.95¢; o1 at $0.14; Claude Opus 4 at $0.16. Long prompts can change the order when long-context rates apply.

Which has the largest context window?

Grok 4.20 — 2M tokens, about 2,900 pages.

Can I run Claude Opus 4, o1, and Grok 4.20 side by side on Alyph?

Yes — that is what Alyph is built for: the identical prompt with identical context to all 3, answers rendered side by side, billed from one wallet. This exact combination costs about $0.31 for a typical task.

Ask all three at once

Identical prompt, identical context, answers side by side — about $0.31 for a typical client proposal. Free to start, with $5 of credit.