Kimi K1.5 vs GPT-5.3-Codex-Spark
Moonshot AI Kimi K1.5 | OpenAI GPT-5.3-Codex-Spark | |
|---|---|---|
| Overview | ||
| Company | Moonshot AI | OpenAI |
| Release date | Jan 20 2025 | Feb 12 2026 |
| Access | Proprietary | Proprietary |
| Specifications | ||
Context window | 128k | 128k |
| Timeline | ||
| Release gap | Kimi K1.5 shipped 388 days before GPT-5.3-Codex-Spark | |
Which is better: Kimi K1.5 or GPT-5.3-Codex-Spark?
Kimi K1.5 and GPT-5.3-Codex-Spark don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Kimi K1.5 shipped 388 days before GPT-5.3-Codex-Spark, so benchmark comparisons should account for the intervening progress.
Context windows are 128k (Kimi K1.5) vs 128k (GPT-5.3-Codex-Spark).
Direct benchmark comparisons are unavailable — Kimi K1.5 and GPT-5.3-Codex-Spark don't publish scores on any of the same benchmarks.
Frequently asked questions
Kimi K1.5 was released by Moonshot AI on Jan 20 2025.
GPT-5.3-Codex-Spark was released by OpenAI on Feb 12 2026.
Kimi K1.5 has a 128k context window; GPT-5.3-Codex-Spark has 128k.
Other comparisons
Kimi K1.5 vs Claude Sonnet 5GPT-5.3-Codex-Spark vs Claude Sonnet 5Kimi K1.5 vs Gemini OmniGPT-5.3-Codex-Spark vs Gemini OmniKimi K1.5 vs Muse Spark 1.1GPT-5.3-Codex-Spark vs Muse Spark 1.1Kimi K1.5 vs Grok 4.5GPT-5.3-Codex-Spark vs Grok 4.5Kimi K1.5 vs DeepSeek-V4-ProGPT-5.3-Codex-Spark vs DeepSeek-V4-ProKimi K1.5 vs Mistral Medium 3.5GPT-5.3-Codex-Spark vs Mistral Medium 3.5