GPT-5.5
OpenAI's current flagship model for complex reasoning, coding, and professional work, documented in the OpenAI API model guide as the default starting point for high-complexity workloads.
Newer version: GPT-5.6 Sol
Provider
OpenAI
Model family
OpenAI GPT
Multimodal LLM
Cost tier
Flagship
Status
Legacy
Why teams choose it
Use as the OpenAI-first default for complex reasoning and coding after validating
latency and cost in your workload.
OpenAI's model guide lists smaller GPT-5.4 variants for lower-latency or lower-cost paths.
Tradeoffs to know
- Validate current model limits and regional availability in OpenAI documentation before rollout.
When not to use this
- Do not infer pricing, availability, or latency from older GPT-4o assumptions.
Technical specs
- Inputs
- text, image
- Outputs
- text
- Capabilities
- reasoning, coding, vision, tool use, function calling
- License
- Proprietary API
Benchmarks
No independent or vendor benchmark scores in this catalog entry.
OpenAI GPT family lineup
Current models
Related models
GPT-5.5 FAQ
What is GPT-5.5?
OpenAI's current flagship model for complex reasoning, coding, and professional work, documented in the OpenAI API model guide as the default starting point for high-complexity workloads.
When does GPT-5.5 fit best?
Complex coding and professional work
What should teams watch out for with GPT-5.5?
Do not infer pricing, availability, or latency from older GPT-4o assumptions.
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