GPT-5.5
Parameters
-
Context Length
1M
Modality
Multimodal
Architecture
Dense
License
Proprietary
Release Date
23 Apr 2026
Knowledge Cutoff
-
Evaluation Benchmarks
Rank
#20
| Benchmark | Score | Rank |
|---|---|---|
Data Analysis high | 0.82 | 🥇 1 |
General high | 0.80 | 🥉 3 |
Mathematics high | 0.96 | 🥉 3 |
LiveBench Average high | 0.80 | 🥉 3 |
Coding high | 0.82 | 5 |
Reasoning high | 0.90 | 5 |
Agent Arena high | 0.09 | 7 |
General Text high | 1482 | ⭐ 8 |
General Text Standard | 1477 | ⭐ 12 |
Agentic Coding high | 0.54 | 10 |
Web Development high | 1507 | 20 |
Rankings
Overall Rank
#20
Coding Rank
-
About GPT-5.5
GPT-5.5 is OpenAI's most capable and efficient frontier model for agentic work, delivering state-of-the-art performance on Terminal-Bench 2.0 (82.7%), SWE-Bench Pro (58.6%), OSWorld-Verified (78.7%), BrowseComp (84.4%), ARC-AGI-2 (85.0%), and FrontierMath Tier 4 (35.4%). Matches GPT-5.4 per-token latency in production while using significantly fewer tokens. Supports text, image, and tool inputs with a 1M context window. Released April 23, 2026 in ChatGPT and Codex; API available as gpt-5.5 at $5/M input and $30/M output tokens.
Technical Specifications
Detailed architecture specifications are limited for proprietary models.
Resources
About GPT-5.5
GPT-5.5 is OpenAI's smartest and most intuitive model yet, and the next step toward a new way of getting work done on a computer. It excels at agentic coding, computer use, knowledge work, and scientific research — areas where progress depends on reasoning across context and taking action over time. It matches GPT-5.4 per-token latency in real-world serving while performing at a significantly higher level of intelligence, and uses fewer tokens to complete the same tasks. State-of-the-art on Terminal-Bench 2.0 (82.7%), SWE-Bench Pro (58.6%), OSWorld-Verified (78.7%), and ARC-AGI-2 (85.0%). Features a 1M context window and costs $5/M input tokens and $30/M output tokens. Released April 23, 2026.