Kimi K2.7 CodevsGPT-5.3-Codex
Kimi K2.7 Code | GPT-5.3-Codex | |
|---|---|---|
| Specifications | ||
Parameters | 1T | — |
Context window | 256k | — |
| Benchmarks | ||
Nonsense detection BullshitBench v2Given 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. | — | 24% |
Agentic coding CursorBench v3.2Cursor's own test of harder, real-world coding tasks inside a code editor, on the refreshed v3.2 task set. Scores aren't comparable with v3.1. Higher is better. | 49.7% | — |
Agentic coding DeepSWE 1.1Artificial Analysis' independent test of deep, agentic software-engineering work — the AI has to plan and carry out substantial coding tasks end to end. (Version 1.1 of the test.) Higher is better. | 31% | — |
Next.js coding Next.js EvalsVercel's open eval of how well AI coding agents build and migrate real Next.js apps — measured as the share of tasks the agent completes successfully. Higher is better. | 75% | 83%Best |
Community preference (code) Arena Elo (Code)Like the text arena, but people vote on which AI writes better code. The votes become a chess-style Elo rating on arena.ai. Higher is better. | 1469Best | 1406 |
| Overview | ||
| Company | Moonshot AI | OpenAI |
| Release date | Jun 12 2026 | Feb 5 2026 |
| Access | Open Weight | Proprietary |
Which is better: Kimi K2.7 Code or GPT-5.3-Codex?
Kimi K2.7 Code and GPT-5.3-Codex are evenly matched across the 2 benchmarks they both report (Next.js Evals, Arena Elo (Code)). GPT-5.3-Codex shipped 127 days before Kimi K2.7 Code, so benchmark comparisons should account for the intervening progress.
Kimi K2.7 Code is open weight, while GPT-5.3-Codex is proprietary.
On Next.js Evals, GPT-5.3-Codex leads at 83% vs Kimi K2.7 Code at 75%. On Arena Elo (Code), Kimi K2.7 Code leads at 1469 vs GPT-5.3-Codex at 1406.
Frequently asked questions
Kimi K2.7 Code was released by Moonshot AI on Jun 12 2026.
GPT-5.3-Codex was released by OpenAI on Feb 5 2026.
GPT-5.3-Codex leads on Next.js Evals — Kimi K2.7 Code 75% vs GPT-5.3-Codex 83%.
Kimi K2.7 Code is an open weight model released by Moonshot AI. GPT-5.3-Codex is a proprietary model released by OpenAI.