GPT-5.5 Pro
OpenAI • LLM#31 of 579 in intelligence
OpenAI: GPT-5.5 Pro by OpenAI
Specifications
Context Window
1.1M tokens
Input Price/1M
$30.00
#710 of 714
Output Price/1M
$180.00
Parameters
—
Max Output
128K tokens
Cost per Task
0.8
AA Score / US$ · higher = better
Benchmarks
GPT-5.5 Pro results on the main AI model evaluation benchmarks. Higher scores indicate better performance.
Coding
| Benchmark | Score | Maximum | Methodology |
|---|---|---|---|
| AA Coding Index | 74.9 | 100.0 | Artificial Analysis official API |
overall
| Benchmark | Score | Maximum | Methodology |
|---|---|---|---|
| AA Intelligence Index | 54.8 | 100.0 | Artificial Analysis official API |
Reasoning
| Benchmark | Score | Maximum | Methodology |
|---|---|---|---|
| GPQA Diamond | 93.5 | 100.0 | Artificial Analysis official API |
Information
- Release date
- April 23, 2026
- Tool Calling
- ❌ Not supported
- Vision
- ❌ Not supported
- Audio
- ❌ Not supported
Full Analysis: GPT-5.5 Pro
What is GPT-5.5 Pro?
GPT-5.5 Pro is an AI model developed by OpenAI, classified as a large language model (LLM). It is a multimodal model, capable of processing text, images, and potentially other media types. As a proprietary model, it is available via OpenAI's cloud API. With a context window of 1.1M tokens, it is suitable for processing long documents such as contracts, books, and complete codebases.
Pricing & Costs in 2026
GPT-5.5 Pro is usage-based, priced at $30/1M input tokens and $180/1M output tokens. For context: 1 million tokens is approximately 750,000 words, or about 10 average-length books. The premium pricing reflects the model's frontier capabilities, recommended for complex reasoning, analysis, and generation tasks where quality takes priority over cost.
Benchmarks & Performance
GPT-5.5 Pro was evaluated on 3 different benchmarks, covering categories like Coding, overall, Reasoning. Results show exceptional performance across available evaluations.
It's important to note that benchmarks measure specific aspects and don't capture the full user experience. Factors like instruction adherence, behavior in long conversations, and real-world task quality vary significantly between models and aren't always reflected in standard scores.
Recommended Use Cases
GPT-5.5 Pro is suitable for a wide range of AI applications: long document analysis (contracts, legal proceedings, codebases), multimodal processing combining text and images, text generation, summarization, translation, and general assistance.
Comparison with Alternatives
In the 2026 AI model ecosystem, GPT-5.5 Pro competes directly with similarly capable models. Key competitors include Claude (Anthropic), Gemini (Google), and open source models like Llama (Meta) and Qwen (Alibaba). The choice between models depends on the specific use case, budget, latency requirements, and need for features like multimodality and tool calling.
For a detailed side-by-side comparison, use our comparison tool or check the overall model ranking.
Frequently Asked Questions
What is GPT-5.5 Pro?
GPT-5.5 Pro is an AI model developed by OpenAI. It is a language model (LLM), with multimodal support (text, image and more).
How much does GPT-5.5 Pro cost?
GPT-5.5 Pro costs $30/1M input tokens and $180/1M output tokens. For heavy usage (e.g., a chatbot handling 100k messages/month), costs can range from $10 to $1,000 depending on volume.
How does GPT-5.5 Pro compare with other models?
In available benchmarks, GPT-5.5 Pro scored: AA Coding Index: 74.9/100, AA Intelligence Index: 54.8/100, GPQA Diamond: 93.5/100. See the full table above for a detailed comparison.
Is GPT-5.5 Pro open source?
No, GPT-5.5 Pro is a proprietary model from OpenAI. It is available via cloud API. For open source alternatives, check our open source model ranking.
What is GPT-5.5 Pro best for?
GPT-5.5 Pro excels at general-purpose language tasks. With its large context window, it handles long documents, codebases, and extended conversations.
Last updated: September 01, 2026 • View methodology →