I tried OpenAI’s codex CLI coding agent again today for the first time in a while.
Update available! 0.1.2504301751 → 0.29.0.I recently shipped a release of Tomo but there was a minor bug with the horizontal scrollbar overlapping a codeblock with syntax highlighting.
I prompted codex to fix this and it seemed to localize the problem and suggest a working fix in one attempt.
ensure that the horizontal scrollbar in styled codeblocks does not overlap the code itself. right now I am seeing that behavior
I was motivated to try this out because I’ve been hearing rumblings about gpt-5 being good at coding.
It’s currently the number 4 coding model on OpenRouter and climbing, relative to both Sonnet and Qwen3 Coder.
| Rank | Model | Company | Parameters | Performance |
|---|---|---|---|---|
| 1 | Grok Code Fast 1 | x-ai | 844B tokens | ↑ 3,231% |
| 2 | Claude Sonnet 4 | anthropic | 339B tokens | ↓ 9% |
| 3 | Qwen3 Coder 480B A35B | qwen | 112B tokens | ↓ 33% |
| 4 | GPT-5 | openai | 66.2B tokens | ↑ 21% |
| 5 | DeepSeek V3.1 | deepseek | 60.9B tokens | ↓ 56% |
I believe Grok Code Fast 1 was launched in some kind of free capacity along with its release which may in part explain its high usage but we will see where that lands.