Kimi K2.6 vs GPT Audio Mini vs Grok 4.20

Kimi K2.6 at $0.667 in and $2.81 out, GPT Audio Mini at $0.690 in and $2.76 out, and Grok 4.20 at $1.44 in and $2.88 out — per million tokens, from the same wallet.

Kimi K2.6

Moonshot AI

0.56¢

for a client proposal

$0.667 in · $2.81 out / 1M

262K context · released 4 months ago

Full page →

GPT Audio Mini

OpenAI

0.57¢

for a client proposal

$0.690 in · $2.76 out / 1M

128K context · released 7 months ago

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 2.1¢ for a typical client proposal.

At a glance

Cheapest input: Kimi K2.6 at $0.667 per million tokens.
Cheapest output: GPT Audio Mini at $2.76 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

Kimi K2.6

0.27¢

GPT Audio Mini

0.28¢

Grok 4.20

0.43¢

Draft a client proposal from notes

5K in · 800 out

Kimi K2.6

0.56¢

GPT Audio Mini

0.57¢

Grok 4.20

0.95¢

Context-heavy session (Alyph workspace)

155K in · 4K out

Kimi K2.6

$0.11

GPT Audio Mini

needs 155K ctx

Grok 4.20

$0.23

Analyze a 50-page legal contract

35K in · 1K out

Kimi K2.6

2.6¢

GPT Audio Mini

2.7¢

Grok 4.20

$0.05

Large architecture refactor

250K in · 3K out

Kimi K2.6

$0.18

GPT Audio Mini

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

Kimi K2.6

GPT Audio Mini

Grok 4.20

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

Pricing

Kimi K2.6

GPT Audio Mini

Grok 4.20

Input / 1M tokens

$0.667

$0.690

$1.44

Output / 1M tokens

$2.81

$2.76

$2.88

Cached input / 1M

$0.112

—

$0.230

Web search

—

0.57¢ / search

Specs

Kimi K2.6

GPT Audio Mini

Grok 4.20

Provider

Moonshot AI

OpenAI

xAI

Released

4 months ago

7 months ago

4 months ago

Context window

262K

128K

Max output

262K

16K

—

Input

Text and Images

Text and Audio

Text, Images, and Files

Output

Text

Text and Audio

Text

Reasoning

Shows its thinking

Answers directly

Shows its thinking

Knowledge cutoff

—

2025-09-01

Try it with real numbers

2K tokens in · 500 tokens out.

Kimi K2.6

Moonshot AI

0.27¢

for this task

49% input · 51% output

Full pricing →

GPT Audio Mini

OpenAI

0.28¢

for this task

50% input · 50% output

Full pricing →

Grok 4.20

xAI

0.43¢

for this task

67% input · 33% output

Full pricing →

All 3, same prompt and context: 0.98¢. That is the entire cost of the comparison.

Your $5 welcome credit covers about 509 of these.

Which should you pick?

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

On price, Kimi K2.6 is the cheapest of the three on a typical task, at about 0.56¢.

For images or files, Kimi K2.6 and Grok 4.20 can read them directly; GPT Audio Mini is text-only.

If you want to watch the model think, Kimi K2.6 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 →

Kimi K2.6 pricing →GPT Audio Mini pricing →Grok 4.20 pricing →Try other combinations →

Questions, answered

Which is cheapest — Kimi K2.6, GPT Audio Mini, or Grok 4.20?

On a typical client proposal (5K tokens in, 800 out): Kimi K2.6 at 0.56¢; GPT Audio Mini at 0.57¢; 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 Kimi K2.6, GPT Audio 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 2.1¢ for a typical task.

Ask all three at once

Identical prompt, identical context, answers side by side — about 2.1¢ for a typical client proposal. Free to start, with $5 of credit.