OpenAI: GPT-5.5
Chat-20%openai/gpt-5.5GPT-5.5 is OpenAI’s frontier model designed for complex professional workloads, building on GPT-5.4 with stronger reasoning, higher reliability, and improved token efficiency on hard tasks. It features a 1M+ token context window (922K input, 128K output) with support for text and image inputs, enabling large-scale reasoning, coding, and multimodal workflows within a single system.
Providers
/v1/chat/completions/v1/responsesCode Examples
from openai import OpenAIclient = OpenAI(base_url="https://api.ofox.io/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 | 1470–1479 | #20 of 374 | 43,495 | |
| Hard Prompts | 1487–1498 | #24 of 374 | 28,643 | |
| Coding | 1499–1513 | #41 of 369 | 12,337 | |
| Math | 1484–1510 | #8 of 362 | 2,241 | |
| Creative Writing | 1439–1455 | #28 of 372 | 7,503 | |
| Instruction Following | 1464–1477 | #18 of 374 | 14,622 | |
| Chinese | 1519–1548 | #6 of 344 | 2,065 |
Source: LMArena · CC BY 4.0 · Updated 2026-07-12 · Methodology ↗ · Ranks compare models within each category of the LMArena text leaderboard (style control). Scores come from third-party human preference evaluations, not from OFOX.