OpenAI: GPT-5.5
Chat-20%openai/gpt-5.5GPT-5.5 is OpenAI's frontier model for complex professional workloads, released on 2026-04-24, building on GPT-5.4 with stronger reasoning, higher reliability, and better token efficiency on hard tasks. It takes text and image input and supports tool use (function calling), prompt caching, and web search, enabling large-scale reasoning, coding, and multimodal workflows in a single system. Context: 1M+ tokens (922K input), output: 128K. Available via OpenAI and Anthropic protocols.
Providers
provider.type: "azure_foundry"/v1/chat/completions/v1/responsesCode Examples
from openai import OpenAIclient = OpenAI(base_url="https://api.ofox.ai/v1",api_key="YOUR_OFOX_API_KEY",)response = client.chat.completions.create(model="openai/gpt-5.5",messages=[{"role": "user", "content": "Hello!"}],)print(response.choices[0].message.content)
Uptime & Status
Benchmarks
OpenAI: GPT-5.5 scores 1474 in the Overall category of the LMArena text leaderboard (style control), ranking #20 of 374 models based on 43,495 human preference votes (updated 2026-07-12).
| Category | Arena Score | 95% CI | Rank | Votes |
|---|---|---|---|---|
| Overall | 1470โ1479 | #20 of 374 | 43,495 | |
| Hard Prompts | 1487โ1498 | #24 of 374 | 28,643 | |
| Coding | 1499โ1513 | #41 of 369 | 12,337 | |
| Math | 1484โ1510 | #8 of 362 | 2,241 | |
| Creative Writing | 1439โ1455 | #28 of 372 | 7,503 | |
| Instruction Following | 1464โ1477 | #18 of 374 | 14,622 | |
| Chinese | 1519โ1548 | #6 of 344 | 2,065 |
Source: LMArena ยท CC BY 4.0 ยท Updated 2026-07-12 ยท Methodology โ ยท Ranks compare models within each category of the LMArena text leaderboard (style control). Scores come from third-party human preference evaluations, not from OFOX.