# Apertis Changelog: 2.1.6 — Performance Improvement

Canonical page: https://apertis.ai/changelog/2.1.6
Markdown mirror: https://apertis.ai/changelog/2.1.6.md
Version: 2.1.6
Title: Performance Improvement
Published: 2026-01-24
Category: fix

Python SDK - Fix API response compatibility issues (v0.1.1)

## Details

### Fix API response compatibility issues (v0.1.1)
-  Make id, object, created fields optional in ChatCompletion
- Make id, object, created, model fields optional in ChatCompletionChunk
- Make Usage fields optional to handle empty usage objects in streaming
- Fix streaming by using httpx send() with stream=True instead of stream context manager

Tested with real API calls:
- Chat completions: working
- Streaming: working
- Embeddings: working
- Tool calling: working