GPT-5.5
OpenAI's smartest and most intuitive model — successor to GPT-5, with major coding, research, and document workflow gains. GPT-5.5 Pro variant also available for heavier reasoning.
Specifications
- Context window
- 400,000 tokens
- Modality
- text, vision, audio
- License
- proprietary
- Family
- GPT
- Release date
- 2026-04-23
Links
Provider status
Timeline
Released
Initial public availability.
Pricing changes, version bumps, and benchmark events appear here as the ingesters land in Phase 5.
Pricing history
Per-million-token cost history graphs (Pro) — chart drops in Phase 6.
Sentiment
Rolling community sentiment from Reddit, X, YouTube, and GitHub issues (Pro) — wiring up in Phase 6.
Benchmarks
Benchmark scores ingest from the Open LLM Leaderboard, LMSys Chatbot Arena, and vendor-published evaluations in Phase 5.
Agents built on GPT-5.5
Open-source autonomous AI agent (formerly Clawdbot, Moltbot — lobster theme). Self-hosted; supports Claude, GPT, KIMI, MiMo, Qwen 3, Llama 4, Mistral, plus local models via Ollama. ~347K GitHub stars.
AI-native code editor, fork of VS Code. Hit $2B ARR in February 2026. Composer mode for natural-language multi-file refactors.
The most widely-adopted AI coding tool, ~15M developer accounts. Multi-model since 2024 — pick your preferred backbone per task.
VS Code extension AI coding agent. 5M+ installs — the most-installed open-source coding agent.
Open-source CLI coding agent. ~147K stars by April 2026. Official GitHub Copilot partnership lets paid Copilot subscribers auth directly into it.
OpenAI's coding agent — runs in CLI, IDE, and cloud-hosted runtimes. Drives the Plus/Pro coding workflow.
OpenAI's browser-using agent. Books flights, fills forms, runs research tasks autonomously inside a sandboxed browser.
Vercel's UI-generation agent. Describe a component or app, get production-ready React + Tailwind + shadcn/ui code, deploy in one click.
Replit's in-browser coding agent. Agent 4 (Mar 2026) introduced parallel task forking that auto-resolves merge conflicts ~90% of the time.
Open-source AI agent from Nous Research with a built-in learning loop — creates skills from experience, persists knowledge, builds a model of its user across sessions. ~60K stars in two months.
Related news
Scaling Trusted Access for Cyber with GPT-5.5 and GPT-5.5-Cyber
OpenAI expanded Trusted Access for Cyber to include GPT-5.5 and GPT-5.5-Cyber, giving verified defenders access to new models for vulnerability research and cyber defense. The update matters because it is aimed at accelerating protection of critical infrastructure while restricting access to vetted users.
GPT-5.5 Instant: smarter, clearer, and more personalized
OpenAI updated ChatGPT’s default model to GPT-5.5 Instant, describing it as smarter, more accurate, and less prone to hallucinations while adding improved personalization controls. The change matters because the default model now aims to deliver clearer responses with more user-specific behavior in everyday ChatGPT use.
GPT-5.5 Instant System Card
OpenAI released the GPT-5.5 Instant system card, documenting the model’s safety, capability, and evaluation results. The card matters because it provides the official technical details needed to assess GPT-5.5 Instant’s behavior, limitations, and risks before deployment.
Introducing GPT-5.5
OpenAI introduced GPT-5.5, describing it as its smartest model yet, with faster performance and improved capability for complex tasks like coding, research, and data analysis across tools. The release signals a push toward a more tool-using general model that can handle multi-step technical work more effectively.
GPT-5.5 System Card
OpenAI published the GPT-5.5 System Card, the safety and capability report for its latest model release. The document matters because system cards typically disclose benchmark results, risk evaluations, and mitigation details that let technical readers assess how the model compares with prior generations.
GPT-5.5 Bio Bug Bounty
OpenAI launched the GPT-5.5 Bio Bug Bounty, a red-teaming challenge aimed at finding universal jailbreaks that could bypass bio safety protections, with rewards of up to $25,000. It matters because it focuses external testing on a high-risk area where a single jailbreak could undermine safety across biological-use cases.