token.app › Compare › GPT-5.1-Codex vs Kimi K3
GPT-5.1-Codex vs Kimi K3
GPT-5.1-Codex is 1.7× cheaper per token on a blended 3:1 basis. Kimi K3 accepts the larger context window (1.0M).
Head to head
Blended price uses a 3:1 input:output mix
| GPT-5.1-Codex | Kimi K3 | |
|---|---|---|
| Provider | OpenAI | Moonshot AI |
| Input $/1M | $1.25 | $3.00 |
| Output $/1M | $10.00 | $15.00 |
| Blended $/1M | $3.44 | $6.00 |
| Context window | 400K | 1.0M |
| Max output | 128K | — |
| Released | Nov 2025 | Jul 2026 |
| Licence | Proprietary | Open weights |
Choose GPT-5.1-Codex if…
- Costs less per token — $3.44 vs $6.00 blended
Choose Kimi K3 if…
- Larger context window (1.0M)
- Open weights — self-hostable
- Newer model (released Jul 2026)
FAQ
Which is better, GPT-5.1-Codex or Kimi K3?
We do not hold independently-run benchmark scores covering both GPT-5.1-Codex and Kimi K3, so we make no quality claim. Their pricing and specifications are compared on this page.
Is GPT-5.1-Codex cheaper than Kimi K3?
GPT-5.1-Codex is cheaper: $3.44 versus $6.00 per million tokens blended at 3:1 input:output. Input alone: $1.25 vs $3.00. Output alone: $10.00 vs $15.00.
What context windows do GPT-5.1-Codex and Kimi K3 have?
GPT-5.1-Codex: 400,000 tokens. Kimi K3: 1,048,576 tokens.
Who makes GPT-5.1-Codex and Kimi K3?
GPT-5.1-Codex is made by OpenAI. Kimi K3 is made by Moonshot AI.