GPT-5.5 is now generally available in GitHub Copilot for Pro+, Business, and Enterprise users as of . OpenAI’s latest model delivers enhanced performance on complex, multi-step agentic coding tasks that previous GPT models couldn’t handle effectively.
| Released by | GitHub |
|---|---|
| Release date | |
| What it is | OpenAI’s latest GPT model integrated into GitHub Copilot |
| Who it’s for | Copilot Pro+, Business, and Enterprise users |
| Where to get it | GitHub Copilot platform |
| Price | Not yet disclosed |
- GPT-5.5 is rolling out to GitHub Copilot Pro+, Business, and Enterprise subscribers
- The model excels at complex, multi-step agentic coding tasks beyond previous GPT capabilities
- Integration includes Microsoft Foundry and Azure OpenAI Service ecosystem support
- Declarative agents can be defined in YAML or written using GitHub Copilot SDK
- Local deployment requires 64 GB system RAM or dual 24 GB VRAM GPUs
- GPT-5.5 represents OpenAI’s most advanced coding model for enterprise development workflows
- Availability is restricted to premium GitHub Copilot tiers, excluding basic plans
- The model addresses real-world coding challenges that stumped previous GPT versions
- Integration spans Microsoft’s enterprise AI ecosystem including Foundry and Azure
- Local deployment options exist for organizations requiring on-premises AI capabilities
What is GPT-5.5
GPT-5.5 is OpenAI’s latest generative pre-trained transformer model specifically optimized for complex coding and agentic tasks. [1] The model builds upon previous GPT architectures to handle multi-step programming challenges that require sustained reasoning across multiple code files and contexts. [5]
GitHub has integrated GPT-5.5 directly into its Copilot platform, making it available to enterprise and professional subscribers. [1] The model supports declarative agent definitions through YAML configuration files and programmatic interfaces via the GitHub Copilot SDK. [3]
What is new vs the previous version
GPT-5.5 introduces significant improvements over GPT-5.1 models in handling complex, multi-step coding workflows. [5]
| Feature | GPT-5.1 | GPT-5.5 |
|---|---|---|
| Multi-step reasoning | Limited context retention | Enhanced agentic task handling |
| Code complexity | Single-file focus | Cross-file project understanding |
| Real-world challenges | Basic problem solving | Complex enterprise scenarios |
| Agent integration | Manual configuration | YAML declarative definitions |
| Context window | Standard capacity | 400K context for Codex integration |
How does GPT-5.5 work
GPT-5.5 operates through a multi-layered architecture that processes coding requests through specialized reasoning pathways. [5]
- Context Analysis: The model analyzes entire codebases to understand project structure and dependencies
- Task Decomposition: Complex coding requests are broken down into manageable sub-tasks
- Agentic Reasoning: Each sub-task is processed through specialized reasoning agents
- Code Generation: Solutions are synthesized across multiple files and modules
- Validation Loop: Generated code is checked for consistency and functionality
The model integrates with Microsoft Foundry Agent Service and supports various agent frameworks including LangGraph and Claude Agent SDK. [3]
Benchmarks and evidence
GitHub reports that GPT-5.5 delivers stronger performance on complex coding tasks compared to previous models. [1]
| Metric | Performance | Source |
|---|---|---|
| Multi-step task completion | Strongest performance to date | [1] |
| Real-world problem resolution | Handles previously unsolvable challenges | [5] |
| Local deployment capability | Comparable to cloud GPT-4o | [7] |
| Context window capacity | 400K tokens for Codex integration | [8] |
Who should care
Builders
Software developers working on complex, multi-file projects will benefit from GPT-5.5’s enhanced reasoning capabilities. The model’s ability to understand cross-file dependencies makes it valuable for large-scale application development and refactoring tasks.
Enterprise
Organizations with GitHub Copilot Business or Enterprise subscriptions gain access to advanced AI coding assistance. [1] The integration with Microsoft Foundry provides enterprise-ready deployment options with enhanced security and compliance features. [3]
End users
Individual developers with Copilot Pro+ subscriptions can leverage GPT-5.5 for personal projects requiring sophisticated code generation. [1] The model’s improved problem-solving capabilities benefit developers tackling challenging algorithmic or architectural problems.
Investors
The GPT-5.5 rollout represents significant advancement in AI-assisted development tools. Integration across Microsoft’s ecosystem signals continued investment in enterprise AI capabilities and potential market expansion opportunities.
How to use GPT-5.5 today
GPT-5.5 is accessible through existing GitHub Copilot interfaces for eligible subscribers. [6]
- Verify subscription: Ensure you have Copilot Pro+, Business, or Enterprise access
- Update Copilot: Install the latest GitHub Copilot extension in your IDE
- Enable GPT-5.5: Select GPT-5.5 from the model dropdown in Copilot settings
- Configure agents: Define declarative agents using YAML or GitHub Copilot SDK
- Test complex tasks: Submit multi-step coding challenges to evaluate performance
For local deployment, organizations need 64 GB system RAM or dual 24 GB VRAM graphics cards. [7]
GPT-5.5 vs competitors
GPT-5.5 competes with other advanced AI coding models in the enterprise development space.
| Feature | GPT-5.5 | Claude Opus 4.7 | GitHub Copilot (GPT-4) |
|---|---|---|---|
| Multi-step reasoning | Advanced agentic capabilities | Strong analytical performance | Basic code completion |
| Context window | 400K tokens (Codex) | Not yet disclosed | 8K-32K tokens |
| Enterprise integration | Microsoft Foundry, Azure | Anthropic API | GitHub native |
| Local deployment | 64 GB RAM requirement | Not yet disclosed | Cloud-only |
| Pricing model | Tier-based access | Usage-based API | Subscription plans |
Risks, limits, and myths
- Hardware requirements: Local deployment demands significant computational resources with 64 GB RAM minimums
- Subscription limitations: Access is restricted to premium GitHub Copilot tiers, excluding basic users
- Model complexity: Advanced features may require additional configuration and technical expertise
- Performance variability: Results may vary based on code complexity and project structure
- Integration dependencies: Full functionality requires compatible development environments and toolchains
- Cost considerations: Premium tier requirements may increase development tool expenses for organizations
FAQ
What GitHub Copilot plans include GPT-5.5 access?
GPT-5.5 is available to Copilot Pro+, Copilot Business, and Copilot Enterprise users. [1] Basic Copilot plans do not include access to the GPT-5.5 model.
When did GPT-5.5 become available in GitHub Copilot?
GPT-5.5 became generally available in GitHub Copilot on . [1] The rollout began for eligible subscribers on that date.
How does GPT-5.5 differ from GPT-5.1 in coding tasks?
GPT-5.5 delivers enhanced performance on complex, multi-step agentic coding tasks that GPT-5.1 models couldn’t handle effectively. [5] It resolves real-world challenges beyond previous GPT capabilities.
Can I run GPT-5.5 locally for development work?
Yes, local deployment requires 64 GB system RAM or dual 24 GB VRAM graphics cards like RTX 3090/4090. [7] Mac users need 64+ GB unified memory for local operation.
What agent frameworks work with GPT-5.5 in Copilot?
GPT-5.5 supports Microsoft Agent Framework, GitHub Copilot SDK, LangGraph, Claude Agent SDK, and OpenAI Agents. [3] Declarative agents can be defined in YAML configuration files.
Does GPT-5.5 integrate with Microsoft Azure services?
Yes, GPT-5.5 integrates with Microsoft Foundry and Azure OpenAI Service for enterprise deployments. [3] This provides enterprise-ready AI capabilities on Microsoft’s cloud platform.
What context window size does GPT-5.5 support?
GPT-5.5 Codex integration supports a 400K token context window for comprehensive code analysis. [8] This enables understanding of large codebases and complex project structures.
Is GPT-5.5 available through GitHub Copilot API?
GPT-5.5 is available through Responses API and Chat Completions API with batch and flex pricing options. [8] Priority processing is available at 2.5x standard rates.
How much does GPT-5.5 access cost in GitHub Copilot?
Specific pricing for GPT-5.5 access has not yet been disclosed by GitHub. [1] Access is included with Pro+, Business, and Enterprise subscription tiers.
What coding languages does GPT-5.5 support best?
Specific language support details for GPT-5.5 have not yet been disclosed in available sources. The model is designed for complex coding tasks across multiple programming paradigms.
Glossary
- Agentic tasks
- Complex AI operations that require multi-step reasoning and autonomous decision-making capabilities
- Declarative agents
- AI agents defined through configuration files (like YAML) rather than imperative programming code
- Context window
- The maximum amount of text (measured in tokens) that an AI model can process in a single request
- GitHub Copilot SDK
- Software development kit for building custom integrations and agents with GitHub Copilot
- Microsoft Foundry
- Enterprise AI platform providing hosted agent services and model deployment capabilities
- Multi-step reasoning
- AI capability to break down complex problems into sequential steps and maintain context across each step
- VRAM
- Video Random Access Memory – specialized memory on graphics cards used for AI model processing
Sources
- GPT-5.5 is generally available for GitHub Copilot – GitHub Changelog. https://github.blog/changelog/2026-04-24-gpt-5-5-is-generally-available-for-github-copilot/
- r/GithubCopilot on Reddit: What are you expecting from a GPT-5.5 rollout in GitHub Copilot? https://www.reddit.com/r/GithubCopilot/comments/1sshlhb/what_are_you_expecting_from_a_gpt55_rollout_in/
- OpenAI’s GPT-5.5 in Microsoft Foundry: Frontier intelligence on an enterprise ready platform | Microsoft Azure Blog. https://azure.microsoft.com/en-us/blog/openais-gpt-5-5-in-microsoft-foundry-frontier-intelligence-on-an-enterprise-ready-platform/
- r/GithubCopilot on Reddit: ChatGPT 5.5 Released! https://www.reddit.com/r/GithubCopilot/comments/1stqi0r/chatgpt_55_released/
- GPT-5.5 is generally available for GitHub Copilot | daily.dev. https://app.daily.dev/posts/gpt-5-5-is-generally-available-for-github-copilot-ju7haynwg
- GPT 5.5 availability in GitHub Copilot · community · Discussion #193843. https://github.com/orgs/community/discussions/193843
- GitHub – GPT-5-5/GPT-5.5: Run GPT-5.5 locally with zero dependencies. https://github.com/GPT-5-5/GPT-5.5
- GPT-5.5 vs Claude Opus 4.7: Benchmarks, Pricing & Coding Compared | Lushbinary. https://lushbinary.com/blog/gpt-5-5-vs-claude-opus-4-7-comparison-benchmarks-pricing/
