Claude Opus 4.7 (Fast) vs GPT-4 vs Grok 4.20

Claude Opus 4.7 (Fast) at $34.50 in and $172.50 out, GPT-4 at $34.50 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 4.7 (Fast)

Anthropic

$0.31

for a client proposal

$34.50 in · $172.50 out / 1M

1M context · released 3 months ago

Full page →

GPT-4

OpenAI

$0.23

for a client proposal

$34.50 in · $69.00 out / 1M

8K context · released May 2023

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 $0.55 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 4.7 (Fast)

$0.16

GPT-4

$0.10

Grok 4.20

0.43¢

Draft a client proposal from notes

5K in · 800 out

Claude Opus 4.7 (Fast)

$0.31

GPT-4

$0.23

Grok 4.20

0.95¢

Context-heavy session (Alyph workspace)

155K in · 4K out

Claude Opus 4.7 (Fast)

$6.04

GPT-4

needs 155K ctx

Grok 4.20

$0.23

Analyze a 50-page legal contract

35K in · 1K out

Claude Opus 4.7 (Fast)

$1.38

GPT-4

needs 35K ctx

Grok 4.20

$0.05

Large architecture refactor

250K in · 3K out

Claude Opus 4.7 (Fast)

$9.14

GPT-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 4.7 (Fast)

GPT-4

Grok 4.20

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

Pricing

Claude Opus 4.7 (Fast)

GPT-4

Grok 4.20

Input / 1M tokens

$34.50

$1.44

Output / 1M tokens

$172.50

$69.00

$2.88

Cached input / 1M

$3.45

—

$0.230

Web search

1.1¢ / search

—

0.57¢ / search

Specs

Claude Opus 4.7 (Fast)

GPT-4

Grok 4.20

Provider

Anthropic

OpenAI

xAI

Released

3 months ago

May 2023

4 months ago

Context window

Max output

128K

—

Input

Text, Images, and Files

Text

Text, Images, and Files

Output

Text

Reasoning

Shows its thinking

Answers directly

Shows its thinking

Knowledge cutoff

—

2021-09-30

2025-09-01

Try it with real numbers

2K tokens in · 500 tokens out.

Claude Opus 4.7 (Fast)

Anthropic

$0.16

for this task

44% input · 56% output

Full pricing →

GPT-4

OpenAI

$0.10

for this task

67% input · 33% output

Full pricing →

Grok 4.20

xAI

0.43¢

for this task

67% input · 33% output

Full pricing →

All 3, same prompt and context: $0.26. That is the entire cost of the comparison.

Your $5 welcome credit covers about 19 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¢.

For images or files, Claude Opus 4.7 (Fast) and Grok 4.20 can read them directly; GPT-4 is text-only.

If you want to watch the model think, Claude Opus 4.7 (Fast) and Grok 4.20 show reasoning; the other answers directly.

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 4.7 (Fast) pricing →GPT-4 pricing →Grok 4.20 pricing →Try other combinations →

Questions, answered

Which is cheapest — Claude Opus 4.7 (Fast), GPT-4, or Grok 4.20?

On a typical client proposal (5K tokens in, 800 out): Grok 4.20 at 0.95¢; GPT-4 at $0.23; Claude Opus 4.7 (Fast) at $0.31. 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 4.7 (Fast), GPT-4, 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 $0.55 for a typical task.

Ask all three at once

Identical prompt, identical context, answers side by side — about $0.55 for a typical client proposal. Free to start, with $5 of credit.