Moonshot AI Kimi K2.6 vs OpenAI GPT-5.3-Codex-Spark — side-by-side specs.
Moonshot AI Kimi K2.6 | OpenAI GPT-5.3-Codex-Spark | |
|---|---|---|
| Overview | ||
| Company | Moonshot AI | OpenAI |
| Release date | Apr 21 2026 | Feb 12 2026 |
| Model type | — | — |
| Open source | No | No |
| Specifications | ||
Parameters | — | — |
Context window | — | 128k |
| Benchmarks | ||
| Timeline | ||
| Release gap | GPT-5.3-Codex-Spark shipped 68 days before Kimi K2.6 | |
Kimi K2.6 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. GPT-5.3-Codex-Spark shipped 68 days before Kimi K2.6, 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 K2.6 and GPT-5.3-Codex-Spark don't publish scores on any of the same benchmarks.