Gemini 1.0 Ultra vs GPT-5-Codex
Google Gemini 1.0 Ultra | OpenAI GPT-5-Codex | |
|---|---|---|
| Overview | ||
| Company | OpenAI | |
| Release date | Feb 8 2024 | Sep 15 2025 |
| 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. | — | 39% |
| Timeline | ||
| Release gap | Gemini 1.0 Ultra shipped 585 days before GPT-5-Codex | |
Which is better: Gemini 1.0 Ultra or GPT-5-Codex?
Gemini 1.0 Ultra and GPT-5-Codex don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Gemini 1.0 Ultra shipped 585 days before GPT-5-Codex, 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 1.0 Ultra and GPT-5-Codex don't publish scores on any of the same benchmarks.
Frequently asked questions
Gemini 1.0 Ultra was released by Google on Feb 8 2024.
GPT-5-Codex was released by OpenAI on Sep 15 2025.
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