English documentation — We currently provide our documentation only in English. This helps us keep the information as accurate and up-to-date as possible during the rapid development of the API.

API

Changelog

Public API changes, additions, and deprecations.

This page lists user-visible changes to the EU GPT public API. Internal changes — model upgrades behind auto, infrastructure moves, performance improvements — are not listed here unless they affect the wire contract.

Versioning policy#

The current major version is v1, served at /v1/.... Breaking changes will land on a new major prefix (/v2/...).
New optional request fields and new streaming event types may land at any time. Clients should ignore unknown event types and continue to send only documented fields.
New response fields may land at any time. Clients should ignore unknown fields.
Deprecations announce themselves here with at least 90 days’ notice before removal.

2026-06#

max_output_tokens (optional) on POST /v1/responses — cap the number of tokens generated for a response. Values above the selected model’s maximum are clamped. Additive; omitting it preserves the previous behaviour.

2026-05#

Initial public release. POST /v1/responses is generally available with streaming and non-streaming modes. OpenAPI 3.1 spec published at /openapi.json.
Auto-approved tools for API callers: web_search, web_fetch, calculator, current_datetime.
API key authentication via Authorization: Bearer eugpt_<token>. Keys are managed in the web UI.

Upcoming#

Items below are committed to the roadmap but do not have firm dates. Subscribe to the changelog feed (forthcoming) for announcements.

POST /v1/files — multipart file upload to mint a file_id from a script.
GET /v1/conversations — list, fetch, and delete conversations programmatically.
Custom tools via a per-request tools[] parameter mirroring the Chat Completions shape.
Audio transcription at POST /v1/audio/transcriptions, OpenAI-compatible.

Deprecations#

None yet.