Gemini Omni vs GPT-5.3-Codex
Google Gemini Omni | OpenAI GPT-5.3-Codex | |
|---|---|---|
| Overview | ||
| Company | OpenAI | |
| Release date | May 19 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. | — | 24% |
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% |
| Timeline | ||
| Release gap | GPT-5.3-Codex shipped 103 days before Gemini Omni | |
Which is better: Gemini Omni or GPT-5.3-Codex?
Gemini Omni 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 103 days before Gemini Omni, 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 Omni and GPT-5.3-Codex don't publish scores on any of the same benchmarks.
Frequently asked questions
Gemini Omni was released by Google on May 19 2026.
GPT-5.3-Codex was released by OpenAI on Feb 5 2026.
Other comparisons
Gemini Omni vs Claude Sonnet 5GPT-5.3-Codex vs Claude Sonnet 5Gemini Omni vs Muse SparkGPT-5.3-Codex vs Muse SparkGemini Omni vs Grok 4.3 BetaGPT-5.3-Codex vs Grok 4.3 BetaGemini Omni vs DeepSeek-V4-ProGPT-5.3-Codex vs DeepSeek-V4-ProGemini Omni vs Mistral Medium 3.5GPT-5.3-Codex vs Mistral Medium 3.5Gemini Omni vs Kimi K2.7 CodeGPT-5.3-Codex vs Kimi K2.7 Code