Last refreshed 2026-06-17. Next refresh: weekly.
Why use GPT-5.5 Pro on OpenRouter?
OpenRouter offers GPT-5.5 Pro with pay-as-you-go pricing at $30.00/1M input tokens. OpenRouter is a multi-provider LLM aggregator offering unified API access to 300+ models from all major labs and emerging providers, with automatic failover for reliability.
Compare GPT-5.5 Pro across 3 providers to find the best fit for your use caseSetup recipe
Docs fallbackUse the provider REST API or SDKCreate a provider API keymodel: openai/gpt-5.5-proopenai/gpt-5.5-proRequest example
openai/gpt-5.5-pro.Gotchas
- Use provider model ID "openai/gpt-5.5-pro", not the LLMReference slug "gpt-5.5-pro".
Compare GPT-5.5 Pro Across Providers
| Provider | Input (per 1M) | Output (per 1M) |
|---|---|---|
| OpenAI API | $30.00 | $180.00 |
| OpenRouter | $30.00 | $180.00 |
| Vercel AI Gateway | — | — |
Pricing
| Type | Price (per 1M) |
|---|---|
| Input tokens | $30.00 |
| Output tokens | $180.00 |
Capabilities
About GPT-5.5 Pro
GPT-5.5 Pro is OpenAI's premium extra-compute deployment of GPT-5.5, released April 23, 2026. It uses the same underlying weights as GPT-5.5 standard with additional parallel test-time compute for harder tasks. Supports text and image inputs, reasoning effort control, tool use, structured outputs, code execution, a 1,050,000-token context window, and 128K max output. Key datapack rows: Terminal-Bench 2.1 78.2%, SWE-bench Pro 58.6%, GPQA Diamond 93.6%, ARC-AGI-2 high effort 83.3%, BrowseComp Pro compute 90.1%, and FrontierMath Tier 4 39.6%. Official pricing is $30/M input and $180/M output; native cached input discount is not listed, and batch pricing is estimated.
FAQ
What does GPT-5.5 Pro cost on OpenRouter?
On OpenRouter, GPT-5.5 Pro costs $30.00 per 1M input tokens and $180.00 per 1M output tokens.
What is the context window for GPT-5.5 Pro on OpenRouter?
GPT-5.5 Pro supports a 1.05m token context window on OpenRouter.
How does OpenRouter compare to other GPT-5.5 Pro providers?
GPT-5.5 Pro is available from 3 providers. The cheapest input pricing is $30.00/1M tokens from OpenAI API.
What API model ID do I use for GPT-5.5 Pro on OpenRouter?
Use the model ID openai/gpt-5.5-pro when calling OpenRouter's API.
Who created GPT-5.5 Pro?
GPT-5.5 Pro was created by OpenAI as part of the GPT-5.5 model family.
Is GPT-5.5 Pro open source?
GPT-5.5 Pro is not open source; the seed data lists it as proprietary.