Side-by-side pricing, context window, and capabilities — try both on ChatLima.
GPT-5.4 Pro is OpenAI's most advanced model, building on GPT-5.4's unified architecture with enhanced reasoning capabilities for complex, high-stakes tasks. It features a 1M+ token context window (922K input, 128K...
Image and document understanding
GPT-5.5 Pro is OpenAI’s high-capability model optimized for deep reasoning and accuracy on complex, high-stakes workloads. It features a 1M+ token context window (922K input, 128K output) with support for...
Image and document understanding
| Feature | OpenAI: GPT-5.4 Pro | OpenAI: GPT-5.5 Pro |
|---|---|---|
| Provider | OpenRouter | OpenRouter |
| Context Length | 1,050,000 tokens | 1,050,000 tokens |
| Input Price | $30.00/M | $30.00/M |
| Output Price | $180.00/M | $180.00/M |
| Vision Support | Yes | Yes |
| Higher cost | Yes | Yes |
| Capabilities | TextVision | TextVision |