ChatGPT
GPT-5.5 — OpenAI
OpenAI's reasoning powerhouse with native computer use. 1M context, 52.5% fewer hallucinated claims than GPT-5.3 Instant on high-stakes prompts, and noticeably more concise. The model that mainstreamed chain-of-thought for the rest of us — now with a more grown-up voice.
Released
Apr 23, 2026
Context
1M tokens
Starting Price
$20/mo (Plus)
Max Output
128K tokens
01
Overview
ChatGPT needs no introduction — it's the model that put AI in everyone's hands. GPT-5.5 is OpenAI's current flagship, launched April 23, 2026. GPT-5.5 Instant became the new default for ChatGPT on May 5, 2026, replacing GPT-5.3 Instant.
The headline win is reliability: GPT-5.5 Instant produces 52.5% fewer hallucinated claims than GPT-5.3 Instant on high-stakes prompts (medicine, law, finance). Responses are also tighter — OpenAI explicitly cut back on "gratuitous emojis" and rambling structure, so you get more signal per token.
GPT-5.5 retains native computer use from the 5.4 line: it can control your desktop directly — clicking, typing, navigating software using screenshots and mouse/keyboard input. Combined with persistent multi-round web search and tool search, it's a legitimate end-to-end agent for long workflows.
GPT-5.5 ships with a 1M token context window and 128K max output. API pricing is $5 per million input tokens and $30 per million output tokens, with batch and flex rates available at half that. Pro and Enterprise subscribers also get GPT-5.5 Pro for the heaviest reasoning workloads. The Free and Go tiers may have limited or no access depending on OpenAI's availability settings.
02
Key Capabilities
52.5% Fewer Hallucinated Claims
GPT-5.5 Instant cuts hallucinations more than half vs. GPT-5.3 Instant on high-stakes domains (medicine, law, finance)
More Concise, Less Filler
OpenAI explicitly trimmed gratuitous emojis and over-structured filler — more signal per response
Native Computer Use
Control desktops directly — click, type, navigate software. End-to-end automation across tools until a task is finished.
1M Token Context
Full 1M-token context window standard with 128K max output
Tool Search
Intelligent tool discovery across large connector ecosystems — meaningful token reduction
Reasoning Tokens
Supports reasoning tokens for chain-of-thought workloads where deeper deliberation matters
Finance-Focused Enterprise Bundle
Native Excel and Google Sheets plugins for financial workflows
Persistent Multi-Round Search
More thorough web search across multiple sources
03
Pricing
| Tier | Price | Details |
|---|---|---|
| Free | $0 | GPT-5.5 Instant (limited or no full access depending on availability). Tight limits. |
| ChatGPT Go | $8/mo | GPT-5.5 Instant + 10x more messages than free. |
| ChatGPT Plus | $20/mo | Full GPT-5.5 access including reasoning. Entry point for 5.5. |
| ChatGPT Pro | $200/mo | Unlimited GPT-5.5 Pro. Dedicated GPU slice for faster inference. |
| ChatGPT Business | $25/user/mo | GPT-5.5 with higher limits. Pro available as add-on. |
| Enterprise | Custom | Full access, security, compliance features. |
| API — GPT-5.5 | $5 / $30 per 1M tokens | Responses + Chat Completions APIs. 1M context, 128K max output. |
| API — Batch / Flex | ~50% off standard | Half-rate pricing for async/batch workloads. |
| API — GPT-5.5 Pro | Premium tier | Highest reasoning tier. See OpenAI API pricing for current rates. |
04
Best Use Cases
Desktop and browser automation via native computer use
Enterprise workflows involving spreadsheets, presentations, and documents
Complex research requiring persistent multi-round web searches
Professional coding (builds on GPT-5.3-Codex foundation)
Tasks requiring long-context planning and execution
Multimodal document parsing and visual understanding
Organizations needing flexible pricing from free to enterprise
05
Pro Prompts
Strategic Planning
Plan a complete marketing strategy for a SaaS launch, including contingencies for each stage. Start with the riskiest assumptions.Computer Use
Open the Q4 sales spreadsheet, filter for deals over $50K, export a summary CSV, and draft an executive email highlighting the top 5 deals by revenue.Research Synthesis
Search for the latest developments in [field] from the past month. Cross-reference at least 5 sources. Highlight where sources disagree and rate your confidence in each finding.Code Review
Review this pull request for security vulnerabilities, performance issues, and adherence to our coding standards. Suggest specific fixes for each issue found.06
Limitations
Hallucinations down 52.5% from GPT-5.3 Instant on high-stakes prompts — but not zero. Remaining errors still tend to land with confidence.
Overactive safety guardrails can block legitimate professional requests (false positives)
Overkill for simple tasks — too resource-heavy and expensive for basic queries
Multi-step reasoning can lose track of earlier assumptions across complex chains
$5/$30 per million tokens isn't the cheapest tier — Grok 4.3 and Gemini 3.1 Flash-Lite undercut it heavily for cost-sensitive workloads
Free and Go tiers may have limited or no full GPT-5.5 access depending on OpenAI's availability settings — Plus ($20/mo) is the safe entry point
OpenAI plans to introduce ads in the free and Go tiers
07
Multimodal Capabilities
Input
- Text
- Images (full-resolution support)
- File uploads (documents, PDFs, spreadsheets)
Computer Use
- Native desktop control
- Screenshots
- Mouse and keyboard input
Output
- DALL-E image generation within ChatGPT
- Multi-round persistent web search
Not Supported
- No native audio or video input processing
- Separate Whisper/TTS models handle audio
08
Recent Updates
May 5, 2026
GPT-5.5 Instant rolled out as the new default model in ChatGPT, replacing GPT-5.3 Instant
Apr 23, 2026
GPT-5.5 launched — OpenAI's smartest model yet, built for complex agentic workflows
Launch Win
52.5% fewer hallucinated claims than GPT-5.3 Instant on high-stakes prompts (medicine, law, finance)
Launch Win
More concise responses by default — OpenAI explicitly cut back on gratuitous emojis and over-structured filler
Carries Over
Native Computer Use, Tool Search, and the finance-focused enterprise bundle (Excel/Sheets plugins) carry over from the 5.4 line