Claude Fable 5 vs Claude Opus 4.7 (Fast)

Claude Fable 5 at $11.50 in and $57.50 out and Claude Opus 4.7 (Fast) at $34.50 in and $172.50 out — per million tokens, from the same wallet.

Claude Fable 5

Anthropic

$0.10

for a client proposal

$11.50 in · $57.50 out / 1M

1M context · released 3 months ago

Full page →

Claude Opus 4.7 (Fast)

Anthropic

$0.31

for a client proposal

$34.50 in · $172.50 out / 1M

1M context · released 4 months ago

Full page →

Asking all both at once — identical prompt, identical context — costs about $0.41 for a typical client proposal.

At a glance

Cheapest input: Claude Fable 5 at $11.50 per million tokens.
Cheapest output: Claude Fable 5 at $57.50 per million tokens.
Identical context windows: 1M 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 Fable 5

$0.05

Claude Opus 4.7 (Fast)

$0.16

Draft a client proposal from notes

5K in · 800 out

Claude Fable 5

$0.10

Claude Opus 4.7 (Fast)

$0.31

Context-heavy session (Alyph workspace)

155K in · 4K out

Claude Fable 5

$2.01

Claude Opus 4.7 (Fast)

$6.04

Analyze a 50-page legal contract

35K in · 1K out

Claude Fable 5

$0.46

Claude Opus 4.7 (Fast)

$1.38

Large architecture refactor

250K in · 3K out

Claude Fable 5

$3.05

Claude Opus 4.7 (Fast)

$9.14

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 Fable 5

Claude Opus 4.7 (Fast)

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

Pricing

Claude Fable 5

Claude Opus 4.7 (Fast)

Input / 1M tokens

$11.50

$34.50

Output / 1M tokens

$57.50

$172.50

Cached input / 1M

$1.15

$3.45

Web search

1.1¢ / search

Specs

Claude Fable 5

Claude Opus 4.7 (Fast)

Provider

Anthropic

Released

3 months ago

4 months ago

Context window

Max output

128K

Input

Text, Images, and Files

Output

Text

Reasoning

Shows its thinking

Knowledge cutoff

—

Try it with real numbers

2K tokens in · 500 tokens out.

Claude Fable 5

Anthropic

$0.05

for this task

44% input · 56% output

Full pricing →

Claude Opus 4.7 (Fast)

Anthropic

$0.16

for this task

44% input · 56% output

Full pricing →

All 2, same prompt and context: $0.21. That is the entire cost of the comparison.

Your $5 welcome credit covers about 24 of these.

Which should you pick?

On price, Claude Fable 5 is the cheapest of the two on a typical task, at about $0.10.

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 Fable 5 pricing →Claude Opus 4.7 (Fast) pricing →Add Lyria 3 Clip Preview Add Grok 4.20

Questions, answered

Which is cheaper, Claude Fable 5 or Claude Opus 4.7 (Fast)?

On a typical client proposal (5K tokens in, 800 out): Claude Fable 5 at $0.10; 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?

They are identical — 1M tokens each, about 1,400 pages.

Can I run Claude Fable 5 and Claude Opus 4.7 (Fast) 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 $0.41 for a typical task.

Ask both at once

Identical prompt, identical context, answers side by side — about $0.41 for a typical client proposal. Free to start, with $5 of credit.