Seed-2.0-Lite vs GPT-5.1-Codex-Mini vs Grok 4.20

Seed-2.0-Lite at $0.287 in and $2.30 out, GPT-5.1-Codex-Mini at $0.287 in and $2.30 out, and Grok 4.20 at $1.44 in and $2.88 out — per million tokens, from the same wallet.

Seed-2.0-Lite

ByteDance Seed

0.33¢

for a client proposal

$0.287 in · $2.30 out / 1M

262K context · released 5 months ago

Full page →

GPT-5.1-Codex-Mini

OpenAI

0.33¢

for a client proposal

$0.287 in · $2.30 out / 1M

400K context · released November 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 1.6¢ for a typical client proposal.

At a glance

Cheapest input: Seed-2.0-Lite at $0.287 per million tokens.
Cheapest output: Seed-2.0-Lite at $2.30 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

Seed-2.0-Lite

0.17¢

GPT-5.1-Codex-Mini

0.17¢

Grok 4.20

0.43¢

Draft a client proposal from notes

5K in · 800 out

Seed-2.0-Lite

0.33¢

GPT-5.1-Codex-Mini

0.33¢

Grok 4.20

0.95¢

Context-heavy session (Alyph workspace)

155K in · 4K out

Seed-2.0-Lite

$0.11

GPT-5.1-Codex-Mini

$0.05

Grok 4.20

$0.23

Long-context rate applied at this input size.

Analyze a 50-page legal contract

35K in · 1K out

Seed-2.0-Lite

1.2¢

GPT-5.1-Codex-Mini

1.2¢

Grok 4.20

$0.05

Large architecture refactor

250K in · 3K out

Seed-2.0-Lite

$0.16

GPT-5.1-Codex-Mini

$0.08

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

Seed-2.0-Lite

GPT-5.1-Codex-Mini

Grok 4.20

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

Pricing

Seed-2.0-Lite

GPT-5.1-Codex-Mini

Grok 4.20

Input / 1M tokens

$0.287

$1.44

Output / 1M tokens

$2.30

$2.88

Cached input / 1M

—

$0.035

$0.230

Web search

—

1.1¢ / search

0.57¢ / search

Specs

Seed-2.0-Lite

GPT-5.1-Codex-Mini

Grok 4.20

Provider

ByteDance Seed

OpenAI

xAI

Released

5 months ago

November 2025

4 months ago

Context window

262K

400K

Max output

131K

128K

—

Input

Text, Images, and Video

Images and Text

Text, Images, and Files

Output

Text

Reasoning

Shows its thinking

Knowledge cutoff

—

2025-09-01

Try it with real numbers

2K tokens in · 500 tokens out.

Seed-2.0-Lite

ByteDance Seed

0.17¢

for this task

33% input · 67% output

Full pricing →

GPT-5.1-Codex-Mini

OpenAI

0.17¢

for this task

33% input · 67% output

Full pricing →

Grok 4.20

xAI

0.43¢

for this task

67% input · 33% output

Full pricing →

All 3, same prompt and context: 0.78¢. That is the entire cost of the comparison.

Your $5 welcome credit covers about 644 of these.

Which should you pick?

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

On price, Seed-2.0-Lite is the cheapest of the three on a typical task, at about 0.33¢.

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 →

Seed-2.0-Lite pricing →GPT-5.1-Codex-Mini pricing →Grok 4.20 pricing →Try other combinations →

Questions, answered

Which is cheapest — Seed-2.0-Lite, GPT-5.1-Codex-Mini, or Grok 4.20?

On a typical client proposal (5K tokens in, 800 out): Seed-2.0-Lite at 0.33¢; GPT-5.1-Codex-Mini at 0.33¢; 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 Seed-2.0-Lite, GPT-5.1-Codex-Mini, 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 1.6¢ for a typical task.

Ask all three at once

Identical prompt, identical context, answers side by side — about 1.6¢ for a typical client proposal. Free to start, with $5 of credit.