Model reference · Synced 2025-04-29
GPT-5.5 Pro
GPT-5.5 Pro is an AI model from Poe. 400K context window. Capabilities: reasoning, tool calling, multimodal vision. Available on 8 providers. Cheapest listing: $27.27 input / $163.64 output per 1M tokens.
Quick facts
- Cheapest input: $27.27 per 1M tokens (Poe)
- Cheapest output: $163.64 per 1M tokens
- Context window: 400K tokens
- Max output: 128K tokens
- Release date: 2026-04-08
- Knowledge cutoff: 2025-12-01
- Capabilities: reasoning, tool calling, multimodal vision
- Provider count: 8
Provider pricing
Same model, different providers, different prices. Cheapest first.
| Provider | Input / 1M | Output / 1M | Context | Listed |
|---|---|---|---|---|
| Poe | $27.27 | $163.64 | 400K | 2026-04-08 |
| OpenRouter | $30 | $180 | 1.1M | 2026-04-23 |
| ZenMux | $30 | $180 | 1.1M | 2026-04-23 |
| OpenCode Zen | $30 | $180 | 1.1M | 2026-04-24 |
| OpenAI | $30 | $180 | 1.1M | 2026-04-23 |
| Vercel AI Gateway | $30 | $180 | 1M | 2026-04-24 |
| LLM Gateway | $30 | $180 | 1.1M | 2026-04-23 |
| Venice AI | $37.5 | $225 | 1M | 2026-04-24 |
Prices synced daily from models.dev + provider docs.
How to use this model
If you're picking GPT-5.5 Pro for a project, the three things that matter most:
- Compare it side-by-side with one or two alternatives in the live comparison tool. Pricing differences matter more than benchmarks at scale.
- Pick the cheapest provider that meets your latency / SLA need. Big spread across providers for the same weights.
- Re-evaluate every 3 months. Frontier prices drop fast; a model that's cheapest today may not be in a quarter.
Related models
FAQ
How much does GPT-5.5 Pro cost? $27.27 input / $163.64 output per 1M tokens at the cheapest listing. See the table above for other providers.
What is the context window? 400K tokens.
Which providers offer it? OpenRouter, ZenMux, OpenCode Zen, Poe, Venice AI, OpenAI, Vercel AI Gateway, LLM Gateway.
Where do these numbers come from? models.dev + provider documentation, synced daily. About the data.