GPT-5.5
OpenAI’s current top-tier API model for complex coding and professional work, with frontier-level reasoning and a premium price profile.
Capability profile
- Input
- $5 / 1M tokens
- Output
- $30 / 1M tokens
- Cached input
- $0.50 / 1M tokens
- Context
- 1.05M tokens
- Free tier
- No / unknown
- API
- Available
- Subscription
- ChatGPT rollout separate from API; API model available in OpenAI docs
- Open-source status
- Closed
- High-stakes coding
- deep multi-step reasoning
- and professional operator workflows where quality matters more than cost.
- Agentic coding
- long-form analysis
- codebase reasoning
- complex planning
- and tool-heavy workflows.
- Cheap high-volume inference and lightweight commodity tasks.
- Low-budget bulk summarization
- simple chat widgets
- or latency-sensitive cheap automation.
This is the kind of model you reach for when failure is expensive. It looks less like a casual chatbot and more like a premium cognitive engine for serious work.
OpenAI’s current top-tier API model for complex coding and professional work, with frontier-level reasoning and a premium price profile.
Post Reboot take
This is the kind of model you reach for when failure is expensive. It looks less like a casual chatbot and more like a premium cognitive engine for serious work.
Strengths
Best for: High-stakes coding, deep multi-step reasoning, and professional operator workflows where quality matters more than cost.
Weakest at: Cheap high-volume inference and lightweight commodity tasks.
Best workflows: Agentic coding, long-form analysis, codebase reasoning, complex planning, and tool-heavy workflows.
Example use cases: Repository-wide refactors, structured technical analysis, multi-step business reasoning, and high-quality drafting with verification loops.