# GPT-5.4 Mini spotted on OpenCode

GPT-5.4 Mini is a model from OpenAI, released on 17 Mar 2026. First seen 19 Sep 2026. Catalogues list a 400,000 tokens context window. 9 evidence links.

- Kind: Sighting
- Developer: OpenAI
- Confidence: Confirmed
- First seen: 2026-09-19T20:25:27.127Z
- Model: [GPT-5.4 Mini](https://alexgetman.com/models/openai/gpt-5-4-mini/)
- Canonical: https://alexgetman.com/signals/2026/09/19/gpt-5-4-mini-xhigh/

## Evidence links

- [OpenCode · discovery](https://opencode.ai/data/openai/gpt-5-4-mini)
- [OpenRouter](https://openrouter.ai/openai/gpt-5.4-mini)
- [Artificial Analysis · benchmarks](https://artificialanalysis.ai/models)
- [OpenRouter](https://openrouter.ai/openai/gpt-5.4-mini:batch)
- [Vercel AI Gateway](https://vercel.com/ai-gateway)
- [OpenAI · pricing](https://developers.openai.com/api/docs/pricing)
- [models.dev · catalogue](https://models.dev/#databricks-gpt-5-4-mini)
- [models.dev · catalogue](https://models.dev/#gpt-5-4-mini)
- [models.dev · catalogue](https://models.dev/#gpt-5.4-mini)