Kimi K2 Thinking vs GPT Audio Mini vs Grok 4.20
Kimi K2 Thinking at $0.690 in and $2.88 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 Thinking
Moonshot AI
0.57¢
for a client proposal
$0.690 in · $2.88 out / 1M
262K context · released November 2025
GPT Audio Mini
OpenAI
0.57¢
for a client proposal
$0.690 in · $2.76 out / 1M
128K context · released 7 months ago
Grok 4.20
xAI
0.95¢
for a client proposal
$1.44 in · $2.88 out / 1M
2M context · released 4 months ago
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 Thinking at $0.690 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 outDraft a client proposal from notes
5K in · 800 outContext-heavy session (Alyph workspace)
155K in · 4K outAnalyze a 50-page legal contract
35K in · 1K outLarge architecture refactor
250K in · 3K outLong-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.
Adjust the ratio slider to change how output tokens influence the final price for equivalent workloads.
Pricing
Specs
Try it with real numbers
2K tokens in · 500 tokens out.
All 3, same prompt and context: 0.99¢. That is the entire cost of the comparison.
Your $5 welcome credit covers about 505 of these.
Which should you pick?
For long documents, Grok 4.20 has the largest context window here — 2M tokens.
On price, GPT Audio Mini is the cheapest of the three on a typical task, at about 0.57¢.
For images or files, Grok 4.20 can read them directly; Kimi K2 Thinking and GPT Audio Mini are text-only.
If you want to watch the model think, Kimi K2 Thinking 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 →
Questions, answered
Which is cheapest — Kimi K2 Thinking, GPT Audio Mini, or Grok 4.20?
Which has the largest context window?
Can I run Kimi K2 Thinking, GPT Audio Mini, and Grok 4.20 side by side on Alyph?
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.