Python

Google says an 11-hour unattended run of Gemini 4 Argon produced two accepted optimizations for its Agent Development Kit (ADK), cutting in-memory session-preparation overhead by about 40% in long sessions and cold package import time by 21%. Argon also produced 4 modifications that developers rejected on review.

OpenAI released v3.21.0 of its official Python SDK on September 29, 2026, adding a constant for a new 'GPT-6.1 Sol' model identifier. No pricing, benchmarks, or capability details have been disclosed.

Anthropic released v1.8.0 of its Python SDK, adding support for the claude-opus-5-5 model, inline tool definitions, and beta MCP tool-list pinning. The release also fixes a Python 3.13 exit crash and several tool-handling bugs.

OpenAI shipped v3.13.0 of its openai-python library, adding support for a new Agents API. The release is a client-library update, not a new model.