Kimi K2 Thinking Turbo vs GPT-5.3-Codex
Kimi K2 Thinking Turbo is cheaper on output tokens, while GPT-5.3-Codex offers a larger context window. Choose Kimi K2 Thinking Turbo or GPT-5.3-Codex based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | Kimi K2 Thinking Turbo | GPT-5.3-Codex |
|---|---|---|
| Provider | Moonshot AI | OpenAI |
| Input / 1M tokens | $1.15 | $1.75 |
| Output / 1M tokens | $8.00 | $14.00 |
| Context window | 262K | 400K |
| Parameters | — | — |
| Open weights | Yes | No |
| Released | Nov 2025 | Feb 2026 |
| LMArena (Chatbot Arena) Elo score | 1414 | — |
| GPQA Diamond score | 84.2 | — |
| LMArena WebDev Elo score | 1322 | 1407 |
| LiveBench score | — | 73.2 |
FAQ
Is Kimi K2 Thinking Turbo or GPT-5.3-Codex cheaper?
Kimi K2 Thinking Turbo is cheaper on output tokens ($8.00 vs $14.00 per 1M).
Which has the larger context window, Kimi K2 Thinking Turbo or GPT-5.3-Codex?
GPT-5.3-Codex has the larger context window (400K tokens).
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.