Compare AI models
| Specifications | ||
Context windowHow much information the model can work with in one request, measured in tokens — pieces of words or other data. This includes your question, attachments, conversation and reply. Limits can vary by model variant and provider. | 128k | 400k |
| These models have no shared benchmark scores. | ||
BullshitBench v2Nonsense detection — Given 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% |
| Overview | ||
| Company | Moonshot AI | OpenAI |
| Release date | Jan 20 2025 | Sep 15 2025 |
| Access | Closed | Closed |
| Model details | View model | View model |
Other comparisons
Kimi K1.5vsClaude Haiku 5.5GPT-5-CodexvsClaude Haiku 5.5Kimi K1.5vsGemini 4 ArgonGPT-5-CodexvsGemini 4 ArgonKimi K1.5vsMuse Spark OpenGPT-5-CodexvsMuse Spark OpenKimi K1.5vsGrok 4.7GPT-5-CodexvsGrok 4.7Kimi K1.5vsDeepSeek-V4.1-Flash-1017GPT-5-CodexvsDeepSeek-V4.1-Flash-1017Kimi K1.5vsMistral Large 4GPT-5-CodexvsMistral Large 4Frequently asked questions
Kimi K1.5 and GPT-5-Codex don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Kimi K1.5 shipped 238 days before GPT-5-Codex, so benchmark comparisons should account for the intervening progress.
Context windows are 128k (Kimi K1.5) vs 400k (GPT-5-Codex).
Direct benchmark comparisons are unavailable — Kimi K1.5 and GPT-5-Codex don't publish scores on any of the same benchmarks.