GPT-5.5 Pro
openai/gpt-5.5-pro- OpenAI
- Family · GPT-5 Pro
- Released 23 Apr 2026
- File · Image · Text → Text
- Reasoning · adjustable
- Tools · JSON · Vision
Spec & list price
Context1M
Max output128K
Input / 1M$30.00
Output / 1M$180.006× input
Usage
Tokens / day4.2M▼ 37% 7d
Usage rank#421
Requests / day2.2K
Tool calls / req0.04
Per request · 30 days
Avg input4.5K0.3× median
Avg output3540.5× median
Reasoning share83%1.5× median
Tool-call failures0.1%0.0× median
Consumption
Peak 146.9M 14 OctLow 3.1M 1 NovRank today #421
News & trends
Trending · 14 days · GPT-5 Pro family
News · latest from OpenAI
- GPT-6.1 Terra vs. Claude Opus 5.5: Cheaper and faster in three tests at maxthenewstack.io · 2 Nov
- Chinese labs now target OpenAI's GPT-6 Astra for distillationfork.zone · 1 Nov
- GPT-6.1 Terrasimonwillison.net · 31 Oct
- GPT-5.6 Sol can beat Factorio on peaceful moderyanmadden.net · 31 Oct
Speed
Output speed#315/33422 tok/s3.0× slower than median
First token#33328 s26.8× longer than median
Technical details
- Reasoning
- on · medium
- Tokenizer
- GPT
- Knowledge cutoff
- 2025-12-01
- Moderation
- moderated
Reasoning effort
- xhigh
- high
- medium · default
Request parameters 10
- tools
- tool_choice
- response_format
- structured_outputs
- reasoning
- reasoning_effort
- include_reasoning
- max_tokens
- seed
- verbosity
Interesting facts
- Weekdays average 45.1M tokens a day against 9.8M on weekends.
- The most used of 4 GPT-5 Pro models by tokens last month.
- Released 193 days ago, the newest of 2 GPT-5 Pro models.
When to use
Best for
- Hardest reasoning and research tasks
- Analysis across very long document sets
- Complex agentic planning with tool calls
- High-stakes work where quality matters most
Think twice for
- Interactive chat needing quick replies
- High-volume simple tasks
- Cost-sensitive workloads
- Self-hosting (closed weights)
Research papers
- On Zeros and Algorithms for Disordered Systems II: The Antiferromagnetic Ising Model up to Kesten-Stigum29 Oct
- Humans vs. Machines: A Comparison With AI Agents in Software Reverse Engineering10 Oct
- ALIBI: Adversarial Legitimacy Injection in Binary Input against LLM Malware Analyzers17 Sep
- The Price of Hidden Curvature: Improved Lower Bounds for Bandit Convex Optimization21 Jul
Same family
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