GPT-5 is documented by OpenAI as a previous model for coding, reasoning, and agentic work, with function-calling support. The API snapshot gpt-5-2025-08-07 is deprecated and scheduled for removal on December 11, 2026; as of this review, deprecated does not mean already shut down.
That documentation supports GPT-5 as a coding-capable model; it does not prove that it is the best choice for your repository or account. It also does not describe every GPT-5-named product as the same model. Keep the requested identity separate from gpt-5-chat-latest, gpt-5-codex, ChatGPT access, and later generations. If you still depend on the deprecated snapshot, include migration timing in the decision.
Test the accessible model on a familiar fix, a multi-file change, a failing test, and an ambiguous requirement. Hold context, tools, and acceptance checks constant. Score correctness, project-rule adherence, successful checks, unnecessary edits, recovery, and reviewer corrections rather than relying on one snippet or a broad rank.
The defensible answer is dated and task-specific. Use GPT-5 when the documented access path remains suitable and the verified result beats your baseline, while planning around the announced snapshot lifecycle.
Source: OpenAI GPT-5 Model; OpenAI Deprecations. Last checked: September 16, 2026 (documentation review; no API or model test).
