Gemini 3.1 Flash-Lite vs GPT-5.3-Codex
Google Gemini 3.1 Flash-Lite | OpenAI GPT-5.3-Codex | |
|---|---|---|
| Overview | ||
| Company | OpenAI | |
| Release date | Mar 3 2026 | Feb 5 2026 |
| Access | Proprietary | Proprietary |
| 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. | 11% | 24%Best |
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. | — | 83% |
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. | — | 1406 |
| Timeline | ||
| Release gap | GPT-5.3-Codex shipped 26 days before Gemini 3.1 Flash-Lite | |
Which is better: Gemini 3.1 Flash-Lite or GPT-5.3-Codex?
GPT-5.3-Codex leads Gemini 3.1 Flash-Lite on 1 of the 1 benchmark they both report (BullshitBench v2). GPT-5.3-Codex shipped 26 days before Gemini 3.1 Flash-Lite, 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.
On BullshitBench v2, GPT-5.3-Codex leads at 24% vs Gemini 3.1 Flash-Lite at 11%.
Frequently asked questions
Gemini 3.1 Flash-Lite was released by Google on Mar 3 2026.
GPT-5.3-Codex was released by OpenAI on Feb 5 2026.
Other comparisons
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