Kimi Chat vs GPT-5-Codex
Moonshot AI Kimi Chat | OpenAI GPT-5-Codex | |
|---|---|---|
| Overview | ||
| Company | Moonshot AI | OpenAI |
| Release date | Oct 2023 | Sep 15 2025 |
| Access | Proprietary | Proprietary |
| Benchmarks | ||
Nonsense detection BullshitBench v2Given a confidently-worded but nonsensical prompt, does the AI spot that it makes no sense and push back — instead of playing along and inventing an answer? The score is how often it clearly called out the nonsense. Higher is better. | — | 39% |
| Timeline | ||
| Release gap | Kimi Chat shipped 715 days before GPT-5-Codex | |
Which is better: Kimi Chat or GPT-5-Codex?
Kimi Chat and GPT-5-Codex don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Kimi Chat shipped 715 days before GPT-5-Codex, so benchmark comparisons should account for the intervening progress.
Published specifications for these two models are limited — see each model page for the latest details.
Direct benchmark comparisons are unavailable — Kimi Chat and GPT-5-Codex don't publish scores on any of the same benchmarks.
Frequently asked questions
Kimi Chat was released by Moonshot AI on Oct 2023.
GPT-5-Codex was released by OpenAI on Sep 15 2025.
Other comparisons
Kimi Chat vs Claude Sonnet 5GPT-5-Codex vs Claude Sonnet 5Kimi Chat vs Gemini OmniGPT-5-Codex vs Gemini OmniKimi Chat vs Muse Spark 1.1GPT-5-Codex vs Muse Spark 1.1Kimi Chat vs Grok 4.5GPT-5-Codex vs Grok 4.5Kimi Chat vs DeepSeek-V4-ProGPT-5-Codex vs DeepSeek-V4-ProKimi Chat vs Mistral Medium 3.5GPT-5-Codex vs Mistral Medium 3.5