A historic month for GitHub Copilot
December 2025 will go down in the record books as the month when GitHub Copilot truly became multi-model. With the general availability launch of GPT-5.2, Claude Opus 4.5 and Gemini 3 Pro, developers now have access to the best AI models from each provider, directly in their IDE.
The new models available
GPT-5.2, GPT-5.1 and Codex variants
17 December 2025 — OpenAI is rolling out its GPT-5 family broadly in GitHub Copilot:
| Model | Status | Specialization |
|---|---|---|
| GPT-5.2 | GA | Latest generation, improved capabilities |
| GPT-5.1 | GA | Balanced performance |
| GPT-5.1-Codex | GA | Optimized for code |
| GPT-5.1-Codex-Max | GA | Maximum capabilities for code |
Anthropic’s Claude Opus 4.5
18 December 2025 — Anthropic’s flagship model moves to general availability after a preview period. Claude Opus 4.5 is known for its deep reasoning capabilities and exceptional contextual understanding.
3 December 2025 — Expansion to IDEs: Claude Opus 4.5 becomes available in Visual Studio, JetBrains IDEs, Xcode and Eclipse.
🔗 Claude Opus 4.5 GA Changelog
Google’s Gemini 3
| Model | Date | Status | Availability |
|---|---|---|---|
| Gemini 3 Flash | 17 Dec | Public preview | VS Code |
| Gemini 3 Pro | 12 Dec | Available | VS, JetBrains, Xcode, Eclipse |
Gemini 3 Flash is now rolling out in public preview in GitHub Copilot. This model is ideal for tasks requiring speed and efficiency. — @github on X
Agent Skills: the era of specialized agents
18 December 2025 — GitHub Copilot now supports Agent Skills, enabling agents to leverage specialized capabilities for complex tasks.
3 December 2025 — Announcement of Custom Agents created by GitHub partners for observability, infrastructure as code and security.
| Domain | Feature |
|---|---|
| Observability | Agents for monitoring and debugging |
| Infrastructure as Code | Terraform, CloudFormation, etc. |
| Security | Vulnerability analysis, compliance |
Copilot Memory: early access
19 December 2025 — GitHub launches early access to Copilot Memory for Pro and Pro+ subscribers. This feature allows Copilot to remember context between sessions, providing a more personalized and continuous experience.
Auto Model Selection
10 December 2025 — Automatic model selection reaches general availability in VS Code. Copilot intelligently chooses the best model based on the task: speed with Gemini 3 Flash, reasoning with Claude Opus 4.5, or code generation with GPT-5.1-Codex.
8 December 2025 — Pro and Pro+ subscribers can also manually choose their preferred model via the Model Picker for the coding agent.
🔗 Auto Model Selection Changelog
Improved GitHub MCP Server
10 December 2025 — GitHub’s MCP (Model Context Protocol) server receives major improvements:
- Tool-specific configuration support
- Better integration with existing workflows
- Optimized performance
C++ editing tools
16 December 2025 — C++ code editing tools arrive in public preview, with specialized features for this demanding language.
Expanded Copilot Code Review
17 December 2025 — The Copilot code review feature becomes available to organization members without a Copilot license. An important democratization for teams.
18 December 2025 — Preview code review features are now supported in GitHub Enterprise Cloud with data residency.
Copilot Spaces: public spaces
1 December 2025 — Copilot Spaces introduces public spaces and code visualization support, making collaboration on shared projects easier.
Metrics and dashboards
December brings several improvements for usage tracking:
| Date | Feature |
|---|---|
| 18 Dec | Enterprise-level PR activity metrics (preview) |
| 16 Dec | Copilot usage tracking by organization |
| 5 Dec | Code generation metrics dashboard |
What this means
December 2025 confirms GitHub Copilot’s multi-model strategy. Developers are no longer limited to a single AI provider: they can choose GPT-5 for its raw power, Claude Opus 4.5 for its reasoning, or Gemini 3 for its speed.
The arrival of Agent Skills and Copilot Memory foreshadows a development assistant that understands your context and can delegate tasks to specialized agents. GitHub Copilot is evolving from a simple autocomplete tool into a complete development assistance platform.
Sources
This document was translated from the fr version into the en language using the gpt-5.4-mini model. For more information about the translation process, see https://gitlab.com/jls42/ai-powered-markdown-translator