Technical Specifications of GPT-5.5
| Item | GPT-5.5 |
|---|---|
| Provider | OpenAI |
| Model Family | GPT-5 series |
| Release Date | April 23, 2026 |
| Input Types | Text, Images |
| Output Types | Text |
| Tool Use | Yes (web browsing, coding tools, computer-use workflows) |
| Context Window | Not officially disclosed |
| Max Output Tokens | Not officially disclosed |
| Primary Strengths | Agentic coding, computer use, knowledge work, scientific research |
| Availability | ChatGPT Plus / Pro / Business / Enterprise, Codex |
| API Access | Announced as coming soon after release |
What is GPT-5.5?
GPT-5.5 is OpenAIโs latest flagship productivity-focused model positioned as a โnew class of intelligence for real work.โ Rather than only answering prompts, GPT-5.5 is optimized to complete messy multi-step tasks with less supervision. It is designed to plan, use tools, check outputs, and persist through ambiguity better than prior GPT-5.4 generation systems.
OpenAI positions GPT-5.5 as a major step toward practical AI coworkers that can finish real tasks instead of only chatting.
Main Features of GPT-5.5
- Stronger autonomous task execution across multi-step workflows
- State-of-the-art coding performance in terminal and repo-scale tasks
- Better spreadsheet, document, and business workflow handling
- Improved computer-use ability: navigating apps, interfaces, files
- More token-efficient than GPT-5.4 on many tasks
- Maintains GPT-5.4-class serving latency while increasing capability
Benchmark Performance of GPT-5.5
| Benchmark | GPT-5.5 | GPT-5.4 |
|---|---|---|
| Terminal-Bench 2.0 | 82.7% | 75.1% |
| Expert-SWE (internal) | 73.1% | 68.5% |
| GDPval | 84.9% | 83.0% |
| OSWorld-Verified | 78.7% | 75.0% |
| Toolathlon | 55.6% | 54.6% |
| BrowseComp | 84.4% | 82.7% |
| FrontierMath Tier 4 | 35.4% | 27.1% |
These numbers suggest GPT-5.5 improves coding, tool use, browsing, and advanced reasoning over GPT-5.4.
GPT-5.5 vs Other Models
| Model | Best For | Relative Position |
|---|---|---|
| GPT-5.5 | Real-world workflows + coding + tools | Most balanced flagship |
| GPT-5.4 | Prior flagship | Lower benchmark scores |
| Claude Opus 4.7 | Writing / reasoning competitor | Trails on some coding evals |
| Gemini 3.1 Pro | Multimodal ecosystem tasks | Trails on several OpenAI evals |
Limitations of GPT-5.5
- Context window not publicly specified at launch
- API access initially delayed for safety rollout
- Can still require human review for critical legal/medical outputs
- Premium availability tiers first
- Some benchmark claims are vendor-reported
Best Use Cases
- Large codebase debugging and refactors
- Research + source gathering workflows
- Spreadsheet analysis and business planning
- Multi-tool automation tasks
- Internal knowledge work and documentation generation
- Scientific exploration and structured analysis
How to access and use GPT-5.5 API
Step 1: Sign Up for API Key
Log in toย cometapi.com. If you are not our user yet, please register first. Sign into yourย CometAPI console. Get the access credential API key of the interface. Click โAdd Tokenโ at the API token in the personal center, get the token key: sk-xxxxx and submit.
Step 2: Send Requests toย GPT-5.5 API
Select the โgpt-5.5โ endpoint to send the API request and set the request body. The request method and request body are obtained from our website API doc. Our website also provides Apifox test for your convenience. Replace <YOUR_API_KEY> with your actual CometAPI key from your account.ย Where to call it:ย ย ย responseย format.
Insert your question or request into the content fieldโthis is what the model will respond to . Process the API response to get the generated answer.
Step 3: Retrieve and Verify Results
Process the API response to get the generated answer. After processing, the API responds with the task status and output data.