Qwen3.5-122B-A10B vs Skyfall 36B V2 vs Grok 4.20

Qwen3.5-122B-A10B at $0.334 in and $2.76 out, Skyfall 36B V2 at $0.632 in and $0.920 out, and Grok 4.20 at $1.44 in and $2.88 out — per million tokens, from the same wallet.

Qwen3.5-122B-A10B

Qwen

0.39¢

for a client proposal

$0.334 in · $2.76 out / 1M

262K context · released 5 months ago

Full page →

Skyfall 36B V2

Thedrummer

0.39¢

for a client proposal

$0.632 in · $0.920 out / 1M

33K context · released March 2025

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 1.7¢ for a typical client proposal.

At a glance

Cheapest input: Qwen3.5-122B-A10B at $0.334 per million tokens.
Cheapest output: Skyfall 36B V2 at $0.920 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

Qwen3.5-122B-A10B

0.2¢

Skyfall 36B V2

0.17¢

Grok 4.20

0.43¢

Draft a client proposal from notes

5K in · 800 out

Qwen3.5-122B-A10B

0.39¢

Skyfall 36B V2

0.39¢

Grok 4.20

0.95¢

Context-heavy session (Alyph workspace)

155K in · 4K out

Qwen3.5-122B-A10B

$0.06

Skyfall 36B V2

needs 155K ctx

Grok 4.20

$0.23

Analyze a 50-page legal contract

35K in · 1K out

Qwen3.5-122B-A10B

1.4¢

Skyfall 36B V2

needs 35K ctx

Grok 4.20

$0.05

Large architecture refactor

250K in · 3K out

Qwen3.5-122B-A10B

$0.09

Skyfall 36B V2

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

Qwen3.5-122B-A10B

Skyfall 36B V2

Grok 4.20

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

Pricing

Qwen3.5-122B-A10B

Skyfall 36B V2

Grok 4.20

Input / 1M tokens

$0.334

$0.632

$1.44

Output / 1M tokens

$2.76

$0.920

$2.88

Cached input / 1M

—

$0.287

$0.230

Web search

—

0.57¢ / search

Specs

Qwen3.5-122B-A10B

Skyfall 36B V2

Grok 4.20

Provider

Qwen

Thedrummer

xAI

Released

5 months ago

March 2025

4 months ago

Context window

262K

33K

Max output

82K

33K

—

Input

Text, Images, and Video

Text

Text, Images, and Files

Output

Text

Reasoning

Shows its thinking

Answers directly

Shows its thinking

Knowledge cutoff

—

2024-06-30

2025-09-01

Try it with real numbers

2K tokens in · 500 tokens out.

Qwen3.5-122B-A10B

Qwen

0.2¢

for this task

33% input · 67% output

Full pricing →

Skyfall 36B V2

Thedrummer

0.17¢

for this task

73% input · 27% output

Full pricing →

Grok 4.20

xAI

0.43¢

for this task

67% input · 33% output

Full pricing →

All 3, same prompt and context: 0.81¢. That is the entire cost of the comparison.

Your $5 welcome credit covers about 618 of these.

Which should you pick?

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

On price, Qwen3.5-122B-A10B is the cheapest of the three on a typical task, at about 0.39¢.

For images or files, Qwen3.5-122B-A10B and Grok 4.20 can read them directly; Skyfall 36B V2 is text-only.

If you want to watch the model think, Qwen3.5-122B-A10B 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 →

Qwen3.5-122B-A10B pricing →Skyfall 36B V2 pricing →Grok 4.20 pricing →Try other combinations →

Questions, answered

Which is cheapest — Qwen3.5-122B-A10B, Skyfall 36B V2, or Grok 4.20?

On a typical client proposal (5K tokens in, 800 out): Qwen3.5-122B-A10B at 0.39¢; Skyfall 36B V2 at 0.39¢; Grok 4.20 at 0.95¢. 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 Qwen3.5-122B-A10B, Skyfall 36B V2, 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 1.7¢ for a typical task.

Ask all three at once

Identical prompt, identical context, answers side by side — about 1.7¢ for a typical client proposal. Free to start, with $5 of credit.