GitHub Copilot recently gained support for OpenAI's latest coding model, GPT-5.4, designed for more complex development tasks, with improvements to reasoning and multi-step problem solving.Its arrival also comes shortly after its rival Anthropic introduced its latest coding model, Claude Opus 4.6, which launched exactly one month before GPT-5.4. For users, both GPT-5.4 and Claude Opus 4.6 are available to those on Copilot Pro, Pro+, Business, and Enterprise plans.One notable difference between the two appears to be the context window. GPT-5.4 offers up to a 400k context window, compared to the 192k available with Claude Opus 4.6, potentially making GPT-5.4 better suited to working with larger codebases.
GitHub Copilot with GPT-5.4 is available across a wide range of development environments, including Visual Studio Code, Visual Studio, JetBrains IDEs, Xcode, Eclipse, GitHub.com, GitHub Mobile, and GitHub CLI — I’ll be honest, I only knew a couple of those different coding environments even existed.
