# GPT-5-Codex

GPT-5-Codex is an AI model released by OpenAI on Sep 15 2025. At release it scored 39% on BullshitBench v2.

## Facts

| Field | Value |
| --- | --- |
| Model | GPT-5-Codex |
| Developer | OpenAI |
| Release date | Monday, Sep 15 2025 |
| Licensing | Proprietary |

## Benchmark scores published at release

| Benchmark | Score | Source | What it measures |
| --- | --- | --- | --- |
| BullshitBench v2 | 39% | Lab | Given 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. |

## Questions and answers

### When was GPT-5-Codex released?

GPT-5-Codex was released by OpenAI on Monday, Sep 15 2025.

### Who made GPT-5-Codex?

GPT-5-Codex was built by OpenAI. Creators of ChatGPT and the GPT series of models. Pioneered large-scale language model research.

### What benchmark scores did GPT-5-Codex get?

GPT-5-Codex reports 1 tracked benchmark score — BullshitBench v2: 39%. Scores are the figures published at release by OpenAI.

### Is GPT-5-Codex open source?

No. GPT-5-Codex is a proprietary model. The weights are not published — it is available only through the provider's own API, apps, or partner platforms.

### What came before and after GPT-5-Codex?

OpenAI's previous tracked release was GPT-5 Pro on Aug 7 2025, 39 days earlier. It was followed by GPT-5-Codex-Mini on Nov 7 2025.


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Canonical page: https://aireleasetracker.com/model/openai/gpt-5-codex
Full dataset: https://aireleasetracker.com/llms-full.txt · JSON: https://aireleasetracker.com/models.json
Source: AI Release Tracker (https://aireleasetracker.com). Benchmark scores are the figures published by the releasing lab at launch.