OpenAI API — September, 2025

September 1, 2025

The Responses API now supports image and file outputs for tool calls, enabling more dynamic and visual interactions within applications. A new specialized model, gpt-5-codex, has also been launched, meticulously built and optimized for seamless use with the Codex CLI. These additions provide developers with enhanced capabilities for richer application experiences and more powerful command-line interactions.

Source: official ChatGPT & Codex release notes. Summaries are written from the official notes; see how we work.

Added

Added support for image and file as a tool call output in Responses API.
Launched special-purpose model gpt-5-codex, built and optimized for use with the Codex CLI.

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