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Step 5 Preview
GPT-5.5 Instant
GPT-5.5 Instant is a proprietary model from OpenAI. It ranks #120 of 351 on the LMArena text leaderboard with a rating of 1419.
- Developer
- OpenAI
- Released
- May 6, 2026
- Context window
- —
- Price in / out, per 1M tokens
- —
- Weights
- Proprietary
- Inputs
- —
- Reasoning
- —
- Tool use
- —
The rating LMArena published at each update since May 6, 2026. Ratings move as votes come in and new models join.
LMArena, by category
| Leaderboard | Rating | Rank | Votes |
|---|---|---|---|
| TextLMArena | 1419 | 120 / 351 | 27.2K |
| CodingLMArena | 1433 | 134 / 346 | 7.9K |
| MathLMArena | 1420 | 123 / 339 | 1.5K |
| Creative writingLMArena | 1418 | 70 / 349 | 4.4K |
| Instruction followingLMArena | 1407 | 113 / 351 | 9.7K |
| Hard promptsLMArena | 1426 | 121 / 351 | 18.4K |
| Multi-turnLMArena | 1434 | 96 / 349 | 5.1K |
| Long queriesLMArena | 1422 | 107 / 330 | 12.6K |
| ExpertLMArena | 1409 | 145 / 305 | 2.8K |
| Legal and governmentIndustries | 1420 | 130 / 325 | 2.3K |
| Medicine and healthcareIndustries | 1412 | 145 / 325 | 2.1K |
| Business and financeIndustries | 1410 | 122 / 344 | 5.7K |
| ChineseLanguages | 1456 | 117 / 328 | 1.7K |
| SpanishLanguages | 1429 | 102 / 249 | 812 |
| GermanLanguages | 1411 | 110 / 261 | 430 |
| FrenchLanguages | 1428 | 124 / 252 | 1K |
| JapaneseLanguages | 1410 | 66 / 236 | 266 |
| VisionLMArena | 1250 | 63 / 146 | 7.6K |
LMArena, CC BY 4.0, as of Oct 22, 2026. Where a model is rated at several effort levels, its best is shown.
Compare GPT-5.5 Instant
OpenAI
The lab behind GPT and ChatGPT, which brought large language models to hundreds of millions of people. Founded 2015, based in San Francisco. openai.com
Questions
Who makes GPT-5.5 Instant?
GPT-5.5 Instant is made by OpenAI, founded 2015 and based in San Francisco.
How does GPT-5.5 Instant rank?
#120 of 351 on LMArena’s text leaderboard, rated 1419 (95% interval 1414–1424) from 27,163 votes, as of Oct 22, 2026.
Is GPT-5.5 Instant open source?
No. GPT-5.5 Instant is proprietary and served through its provider’s API.