Gemini 3.6 FlashvsGPT-5.3-Codex
Gemini 3.6 Flash | GPT-5.3-Codex | |
|---|---|---|
| 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 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. | 49% | — |
ML engineering MLE-BenchCan the AI do the work of a machine-learning engineer? It competes in real Kaggle competitions — building, training, and tuning models end to end — and the score reflects how well it places. Higher is better. | 63.9% | — |
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% |
Browser agent BU BenchCan the AI drive a real web browser to finish tasks — clicking, filling forms, and navigating sites the way a person would? Run by Browser Use on their BU Bench task set. Higher is better. | 68% | — |
Agentic computer use OSWorld-VerifiedCan the AI actually operate a computer — clicking, typing, and using real apps — to finish tasks on its own? Higher is better. | 83% | — |
Knowledge work GDPval-AA v2economically valuable knowledge work (v2, re-based Elo) | 1421 | — |
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 166 days before Gemini 3.6 Flash | |
| Overview | ||
| Company | OpenAI | |
| Release date | Jul 21 2026 | Feb 5 2026 |
| Access | Proprietary | Proprietary |
Which is better: Gemini 3.6 Flash or GPT-5.3-Codex?
Gemini 3.6 Flash and GPT-5.3-Codex don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. GPT-5.3-Codex shipped 166 days before Gemini 3.6 Flash, 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 — Gemini 3.6 Flash and GPT-5.3-Codex don't publish scores on any of the same benchmarks.
Frequently asked questions
Gemini 3.6 Flash was released by Google on Jul 21 2026.
GPT-5.3-Codex was released by OpenAI on Feb 5 2026.
Other comparisons
Gemini 3.6 FlashvsClaude Sonnet 5GPT-5.3-CodexvsClaude Sonnet 5Gemini 3.6 FlashvsMuse Spark 1.1GPT-5.3-CodexvsMuse Spark 1.1Gemini 3.6 FlashvsGrok 4.5GPT-5.3-CodexvsGrok 4.5Gemini 3.6 FlashvsDeepSeek-V4-ProGPT-5.3-CodexvsDeepSeek-V4-ProGemini 3.6 FlashvsMistral Medium 3.5GPT-5.3-CodexvsMistral Medium 3.5Gemini 3.6 FlashvsKimi K3GPT-5.3-CodexvsKimi K3