Gemini 2.5 Flash vs GPT-5.3-Codex-Spark
Google Gemini 2.5 Flash | OpenAI GPT-5.3-Codex-Spark | |
|---|---|---|
| Overview | ||
| Company | OpenAI | |
| Release date | Apr 17 2025 | Feb 12 2026 |
| Access | Proprietary | Proprietary |
| Specifications | ||
Context window | — | 128k |
| 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. | 19% | — |
| Timeline | ||
| Release gap | Gemini 2.5 Flash shipped 301 days before GPT-5.3-Codex-Spark | |
Which is better: Gemini 2.5 Flash or GPT-5.3-Codex-Spark?
Gemini 2.5 Flash and GPT-5.3-Codex-Spark don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Gemini 2.5 Flash shipped 301 days before GPT-5.3-Codex-Spark, 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 2.5 Flash and GPT-5.3-Codex-Spark don't publish scores on any of the same benchmarks.
Frequently asked questions
Gemini 2.5 Flash was released by Google on Apr 17 2025.
GPT-5.3-Codex-Spark was released by OpenAI on Feb 12 2026.
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