GPT-5.1-Codex-Mini vs Kimi K3.1 Pro
Price, context window & benchmark comparison
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Verdict: GPT-5.1-Codex-Mini is 5.8× cheaper than Kimi K3.1 Pro on a typical 3:1 input/output mix. Kimi K3.1 Pro has the larger context window (1M vs 400K).
| GPT-5.1-Codex-Mini | Kimi K3.1 Pro | |
|---|---|---|
| Input price / 1M | $0.25 | $2.00 |
| Output price / 1M | $2.00 | $10.00 |
| Blended price (3:1) | $0.69 | $4.00 |
| Cached input / 1M | $0.03 | $0.20 |
| Context window | 400K | 1M |
| Max output | 128K | 944K |
| Intelligence index | — | 46.5 |
| Coding index | — | — |
| Providers | — | 23 |
| Best provider uptime (30m) | — | 100.0% |
| Vision input | Yes | Yes |
| Reasoning | Yes | Yes |
| Tool calling | Yes | Yes |
| Released | 2025-11-13 | 2026-10-23 |
| Retirement | — | — |
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FAQ
Which is cheaper, GPT-5.1-Codex-Mini or Kimi K3.1 Pro?
GPT-5.1-Codex-Mini is 5.8× cheaper than Kimi K3.1 Pro on a typical 3:1 input/output mix.
GPT-5.1-Codex-Mini vs Kimi K3.1 Pro: which has a bigger context window?
GPT-5.1-Codex-Mini: 400,000 tokens. Kimi K3.1 Pro: 1,048,576 tokens.
How much would 1 million requests cost?
At 2,000 input + 500 output tokens per request: GPT-5.1-Codex-Mini ≈ $1,500, Kimi K3.1 Pro ≈ $9,000.
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