OpenAI: GPT-5.1-Codex vs MoonshotAI: Kimi K2 Thinking
openai vs moonshotai
On price, MoonshotAI: Kimi K2 Thinking is cheaper (blended cost is about 0.31× that of OpenAI: GPT-5.1-Codex).
On capability, OpenAI: GPT-5.1-Codex has the higher intelligence index (24) — better for complex reasoning.
Verdict: pick MoonshotAI: Kimi K2 Thinking on a budget, or OpenAI: GPT-5.1-Codex for output quality. Full details below.
Side-by-Side Specs
| Metric | OpenAI: GPT-5.1-Codex | MoonshotAI: Kimi K2 Thinking |
|---|---|---|
| Input /1M | $1.25 | $0.60 |
| Output /1M | $10.00 | $2.50 |
| Blended (3:1) | $3.44 | $1.07 |
| Context | 400K | 262K |
| Intelligence | 24 | 22 |
| Coding | 37 | 35 |
| Math | 96 | 95 |
| Speed | 125 tok/s | 119 tok/s |
| CPS Grade | A | A |
FAQ
Which is cheaper, OpenAI: GPT-5.1-Codex or MoonshotAI: Kimi K2 Thinking?
On price, MoonshotAI: Kimi K2 Thinking is cheaper (blended cost is about 0.31× that of OpenAI: GPT-5.1-Codex). OpenAI: GPT-5.1-Codex: $1.25 in / $10 out; MoonshotAI: Kimi K2 Thinking: $0.6 in / $2.5 out (per 1M tokens).
Which is smarter, OpenAI: GPT-5.1-Codex or MoonshotAI: Kimi K2 Thinking?
On capability, OpenAI: GPT-5.1-Codex has the higher intelligence index (24) — better for complex reasoning. Coding index: OpenAI: GPT-5.1-Codex 37 vs MoonshotAI: Kimi K2 Thinking 35.
Which one should I choose?
Verdict: pick MoonshotAI: Kimi K2 Thinking on a budget, or OpenAI: GPT-5.1-Codex for output quality. Full details below.