Kimi K2 Thinking vs GPT-4.1 nano
Moonshot AI Kimi K2 Thinking | OpenAI GPT-4.1 nano | |
|---|---|---|
| Overview | ||
| Company | Moonshot AI | OpenAI |
| Release date | Nov 6 2025 | Apr 14 2025 |
| Access | Open Weight | Proprietary |
| Specifications | ||
Parameters | 1T | — |
Context window | 256k | 1M |
| Benchmarks | ||
Coding SWE-Bench VerifiedReal coding tasks pulled from open-source projects — the AI has to find and fix actual bugs. A human-checked version of the original SWE-Bench. Higher is better. | 71.3% | — |
| Timeline | ||
| Release gap | GPT-4.1 nano shipped 206 days before Kimi K2 Thinking | |
Which is better: Kimi K2 Thinking or GPT-4.1 nano?
Kimi K2 Thinking and GPT-4.1 nano don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. GPT-4.1 nano shipped 206 days before Kimi K2 Thinking, so benchmark comparisons should account for the intervening progress.
Context windows are 256k (Kimi K2 Thinking) vs 1M (GPT-4.1 nano). Kimi K2 Thinking is open weight, while GPT-4.1 nano is proprietary.
Direct benchmark comparisons are unavailable — Kimi K2 Thinking and GPT-4.1 nano don't publish scores on any of the same benchmarks.
Frequently asked questions
Kimi K2 Thinking was released by Moonshot AI on Nov 6 2025.
GPT-4.1 nano was released by OpenAI on Apr 14 2025.
Kimi K2 Thinking has a 256k context window; GPT-4.1 nano has 1M.
Kimi K2 Thinking is an open weight model released by Moonshot AI. GPT-4.1 nano is a proprietary model released by OpenAI.