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GPT-5.5
OpenAI's flagship general-purpose model, powering the standard ChatGPT experience.
Quality
Modality
multimodal
Context
1M tokens
Access
closed
Fabian's Take
"GPT-5.5 is the reliable workhorse. I don't use it for my most complex architectural planning or creative writing, but if I just need something formatted, summarized, or translated quickly, it rarely misses."
GPT-5.5 is OpenAI’s flagship conversational model. As the default engine powering ChatGPT, it is arguably the most widely used AI model in the world. It excels at general-purpose tasks, instruction following, and providing a reliable, consistent user experience.
How it compares
While OpenAI’s o-series models focus on deep, multi-step logical reasoning, the GPT-5 series is designed for broad utility. It handles conversational flow naturally and integrates flawlessly with OpenAI’s tool-calling ecosystem (like web search and code execution). However, for purely creative writing, many users still prefer Anthropic’s Claude family.
The Verdict
Best for: General chat, reliable instruction following, and broad knowledge retrieval.
Pros
- Highly reliable instruction following
- Excellent broad knowledge base
- Deep integration into the OpenAI ecosystem
Cons
- Writing style can still feel a bit artificial
- API pricing is relatively high compared to open-weights options
Specs
- Pricing $5/M input, $30/M output
- Cost Tier premium
- ⚡Speed Tier fast
- License Proprietary
