GPT-5.5 Pro is a OpenAI model tracked in Sim. It supports a 1.05M token context window. Pricing starts at $30/1M input tokens and $180/1M output tokens. Key capabilities include Tool choice, Structured outputs, Reasoning medium, high, xhigh.
GPT-5.5 is a OpenAI model tracked in Sim. It supports a 1.05M token context window. Pricing starts at $5/1M input tokens and $30/1M output tokens. Key capabilities include Tool choice, Structured outputs, Reasoning none, low, medium, high, xhigh.
GPT-5.4 Pro is a OpenAI model tracked in Sim. It supports a 1.05M token context window. Pricing starts at $30/1M input tokens and $180/1M output tokens. Key capabilities include Tool choice, Structured outputs, Reasoning medium, high, xhigh.
When each model was first publicly available.
gpt-4.1
gpt-4.1-mini
gpt-4.1-nano
gpt-5.5-pro
gpt-5.5
gpt-5.4-pro
gpt-5.4
gpt-5.4-mini
gpt-5.4-nano
gpt-5.2-pro
gpt-5.2
gpt-5.1
gpt-5-pro
gpt-5
gpt-5-mini
gpt-5-nano
gpt-5-chat-latest
o4-mini
o3-pro
o3
o3-mini
o1
gpt-4o
Anthropic's Claude models
Google's Gemini models
DeepSeek's chat models
xAI's Grok models
Sim currently tracks 23 OpenAI models including GPT-4.1, GPT-4.1 Mini, GPT-4.1 Nano, GPT-5.5 Pro, GPT-5.5, GPT-5.4 Pro, and more.
GPT-4.1 is the default OpenAI model in Sim.
GPT-5 Nano currently has the lowest listed input price at $0.05/1M tokens.
GPT-5.5 Pro currently has the largest listed context window at 1.05M tokens.
All OpenAI models in Sim support tool use and function calling, allowing agents to invoke external APIs, query databases, and run custom actions.