GPT-6.1 Sol Pro is the same underlying model as [GPT-6.1 Sol](https://openrouter.ai/openai/gpt-6.1-sol), served with `reasoning.mode` set to `pro` for higher-quality responses on complex tasks. **Cost note:** pro mode spends far more...
Specs
More models from OpenAI
GPT-6.1 Sol Pro is the same underlying model as [GPT-6.1 Sol](https://openrouter.ai/openai/gpt-6.1-sol), served with `reasoning.mode` set to `pro` for higher-quality responses on complex tasks. **Cost note:** pro mode spends far more...
GPT-6.1 Sol is an upgrade to GPT-6 Sol from OpenAI, positioned below the flagship GPT-6 Astra in the GPT-6 series. It is suited for agentic coding, computer use, document-heavy professional...
GPT-6.1 Sol is an upgrade to GPT-6 Sol from OpenAI, positioned below the flagship GPT-6 Astra in the GPT-6 series. It is suited for agentic coding, computer use, document-heavy professional...
GPT-6 Luna Pro is the same underlying model as [GPT-6 Luna](https://openrouter.ai/openai/gpt-6-luna), served with `reasoning.mode` set to `pro` for higher-quality responses on complex tasks. **Cost note:** pro mode spends far more...
GPT-6 Luna Pro is the same underlying model as [GPT-6 Luna](https://openrouter.ai/openai/gpt-6-luna), served with `reasoning.mode` set to `pro` for higher-quality responses on complex tasks. **Cost note:** pro mode spends far more...
GPT-6 Luna is the fast, cost-efficient model in OpenAI's GPT-6 series, positioned below GPT-6 Sol. It is suited for high-volume and latency-sensitive workloads such as chat, classification, and lightweight agentic...
GPT-6 Luna is the fast, cost-efficient model in OpenAI's GPT-6 series, positioned below GPT-6 Sol. It is suited for high-volume and latency-sensitive workloads such as chat, classification, and lightweight agentic...
Questions about GPT-4.5 Preview
What is GPT-4.5 Preview?
A very large research-preview model focused on natural writing and broad knowledge. It was expensive to run and was removed from the API a few months later.
How big is the context window of GPT-4.5 Preview?
GPT-4.5 Preview can read up to 128,000 tokens in one request, roughly 96,000 words.
Is GPT-4.5 Preview open source?
GPT-4.5 Preview does not have downloadable weights. You use it through OpenAI or an API provider.
Can I still use GPT-4.5 Preview?
OpenAI has switched GPT-4.5 Preview off, so it can no longer be used through their app or API. It is listed here for history and comparison; see the newer OpenAI models below.
What can GPT-4.5 Preview take as input?
GPT-4.5 Preview accepts text, image and produces text.
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Specs come from the provider's announcement and papers. Last checked 27 Feb 2025.