DeepSeek V4 Flash 0423 vs Qwen3 8B vs Grok 4.20

DeepSeek V4 Flash 0423 at $0.161 in and $0.322 out, Qwen3 8B at $0.135 in and $0.523 out, and Grok 4.20 at $1.44 in and $2.88 out — per million tokens, from the same wallet.

DeepSeek V4 Flash 0423

DeepSeek

0.11¢

for a client proposal

$0.161 in · $0.322 out / 1M

1.05M context · released 4 months ago

Full page →

Qwen3 8B

Qwen

0.11¢

for a client proposal

$0.135 in · $0.523 out / 1M

131K context · released April 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 1.2¢ for a typical client proposal.

At a glance

Cheapest input: Qwen3 8B at $0.135 per million tokens.
Cheapest output: DeepSeek V4 Flash 0423 at $0.322 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

DeepSeek V4 Flash 0423

0.05¢

Qwen3 8B

0.05¢

Grok 4.20

0.43¢

Draft a client proposal from notes

5K in · 800 out

DeepSeek V4 Flash 0423

0.11¢

Qwen3 8B

0.11¢

Grok 4.20

0.95¢

Context-heavy session (Alyph workspace)

155K in · 4K out

DeepSeek V4 Flash 0423

2.6¢

Qwen3 8B

needs 155K ctx

Grok 4.20

$0.23

Analyze a 50-page legal contract

35K in · 1K out

DeepSeek V4 Flash 0423

0.6¢

Qwen3 8B

0.52¢

Grok 4.20

$0.05

Large architecture refactor

250K in · 3K out

DeepSeek V4 Flash 0423

4.1¢

Qwen3 8B

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

DeepSeek V4 Flash 0423

Qwen3 8B

Grok 4.20

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

Pricing

DeepSeek V4 Flash 0423

Qwen3 8B

Grok 4.20

Input / 1M tokens

$0.161

$0.135

$1.44

Output / 1M tokens

$0.322

$0.523

$2.88

Cached input / 1M

$0.032

—

$0.230

Web search

—

0.57¢ / search

Specs

DeepSeek V4 Flash 0423

Qwen3 8B

Grok 4.20

Provider

DeepSeek

Qwen

xAI

Released

4 months ago

April 2025

4 months ago

Context window

1.05M

131K

Max output

393K

—

Input

Text

Text, Images, and Files

Output

Text

Reasoning

Shows its thinking

Knowledge cutoff

—

2025-03-31

2025-09-01

Try it with real numbers

2K tokens in · 500 tokens out.

DeepSeek V4 Flash 0423

DeepSeek

0.05¢

for this task

67% input · 33% output

Full pricing →

Qwen3 8B

Qwen

0.05¢

for this task

51% input · 49% output

Full pricing →

Grok 4.20

xAI

0.43¢

for this task

67% input · 33% output

Full pricing →

All 3, same prompt and context: 0.53¢. That is the entire cost of the comparison.

Your $5 welcome credit covers about 938 of these.

Which should you pick?

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

On price, DeepSeek V4 Flash 0423 is the cheapest of the three on a typical task, at about 0.11¢.

For images or files, Grok 4.20 can read them directly; DeepSeek V4 Flash 0423 and Qwen3 8B are text-only.

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 →

DeepSeek V4 Flash 0423 pricing →Qwen3 8B pricing →Grok 4.20 pricing →Try other combinations →

Questions, answered

Which is cheapest — DeepSeek V4 Flash 0423, Qwen3 8B, or Grok 4.20?

On a typical client proposal (5K tokens in, 800 out): DeepSeek V4 Flash 0423 at 0.11¢; Qwen3 8B at 0.11¢; 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 DeepSeek V4 Flash 0423, Qwen3 8B, 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 1.2¢ for a typical task.

Ask all three at once

Identical prompt, identical context, answers side by side — about 1.2¢ for a typical client proposal. Free to start, with $5 of credit.