Kimi Linear vs GPT-5.3-Codex-Spark
Moonshot AI Kimi Linear | OpenAI GPT-5.3-Codex-Spark | |
|---|---|---|
| Overview | ||
| Company | Moonshot AI | OpenAI |
| Release date | Oct 2025 | Feb 12 2026 |
| Access | Open Weight | Proprietary |
| Specifications | ||
Parameters | 48B | — |
Context window | — | 128k |
| Timeline | ||
| Release gap | Kimi Linear shipped 134 days before GPT-5.3-Codex-Spark | |
Which is better: Kimi Linear or GPT-5.3-Codex-Spark?
Kimi Linear 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 Linear shipped 134 days before GPT-5.3-Codex-Spark, so benchmark comparisons should account for the intervening progress.
Kimi Linear is open weight, while GPT-5.3-Codex-Spark is proprietary.
Direct benchmark comparisons are unavailable — Kimi Linear and GPT-5.3-Codex-Spark don't publish scores on any of the same benchmarks.
Frequently asked questions
Kimi Linear was released by Moonshot AI on Oct 2025.
GPT-5.3-Codex-Spark was released by OpenAI on Feb 12 2026.
Kimi Linear is an open weight model released by Moonshot AI. GPT-5.3-Codex-Spark is a proprietary model released by OpenAI.
Other comparisons
Kimi Linear vs Claude Sonnet 5GPT-5.3-Codex-Spark vs Claude Sonnet 5Kimi Linear vs Gemini OmniGPT-5.3-Codex-Spark vs Gemini OmniKimi Linear vs Muse Spark 1.1GPT-5.3-Codex-Spark vs Muse Spark 1.1Kimi Linear vs Grok 4.5GPT-5.3-Codex-Spark vs Grok 4.5Kimi Linear vs DeepSeek-V4-ProGPT-5.3-Codex-Spark vs DeepSeek-V4-ProKimi Linear vs Mistral Medium 3.5GPT-5.3-Codex-Spark vs Mistral Medium 3.5