AI Observatory / Model Radar
OpenAI / openai/gpt-5.5-pro
OpenAI: GPT-5.5 Pro
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...
1,050,000
Context
128,000
Max output
$30.00 / 1M
Prompt price
2026-04-24
Created
01 / Snapshot
Pricing, context, modalities, and parameters.
Model Radar detail pages stay neutral and operator-readable: core metadata first, then workflow fit.
| Provider | OpenAI | Input modalities | file, image, text |
|---|---|---|---|
| Output modalities | text | Prompt price | $30.00 / 1M |
| Completion price | $180.00 / 1M | Request price | N/A |
| Context length | 1,050,000 | Max completion tokens | 128,000 |
| Supported parameters | include_reasoning, max_tokens, reasoning, response_format, seed, structured_outputs, tool_choice, tools | ||
Best for
openai/gpt-5.5-pro
OpenAI: GPT-5.5 Pro
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...
Deep analysis
Cross-modal work
Long context
Coding workflows
new
vision
tool-capable
long-context
03 / Colophon
Routes and exits.
Each model page stays simple: overview, compare, related models, then back to the public hub.