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Step 5 Preview
GPT-5.3 Chat
GPT-5.3 Chat is a proprietary model from OpenAI. It ranks #170 of 351 on the LMArena text leaderboard with a rating of 1389.
- Developer
- OpenAI
- Released
- Mar 4, 2026
- Context window
- —
- Price in / out, per 1M tokens
- —
- Weights
- Proprietary
- Inputs
- —
- Reasoning
- —
- Tool use
- —
The rating LMArena published at each update since Mar 4, 2026. Ratings move as votes come in and new models join.
LMArena, by category
| Leaderboard | Rating | Rank | Votes |
|---|---|---|---|
| TextLMArena | 1389 | 170 / 351 | 34.3K |
| CodingLMArena | 1407 | 168 / 346 | 9.2K |
| MathLMArena | 1389 | 179 / 339 | 2.1K |
| Creative writingLMArena | 1355 | 162 / 349 | 5.4K |
| Instruction followingLMArena | 1378 | 160 / 351 | 11.2K |
| Hard promptsLMArena | 1399 | 168 / 351 | 21.6K |
| Multi-turnLMArena | 1412 | 134 / 349 | 6.5K |
| Long queriesLMArena | 1395 | 156 / 330 | 13.4K |
| ExpertLMArena | 1396 | 164 / 305 | 3K |
| Legal and governmentIndustries | 1394 | 166 / 325 | 2.6K |
| Medicine and healthcareIndustries | 1392 | 165 / 325 | 2.6K |
| Business and financeIndustries | 1384 | 166 / 344 | 6.8K |
| ChineseLanguages | 1432 | 148 / 328 | 2.3K |
| SpanishLanguages | 1371 | 175 / 249 | 1.3K |
| GermanLanguages | 1384 | 139 / 261 | 522 |
| FrenchLanguages | 1398 | 158 / 252 | 1.1K |
| JapaneseLanguages | 1352 | 126 / 236 | 273 |
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-5.3 Chat
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-5.3 Chat?
GPT-5.3 Chat is made by OpenAI, founded 2015 and based in San Francisco.
How does GPT-5.3 Chat rank?
#170 of 351 on LMArena’s text leaderboard, rated 1389 (95% interval 1385–1393) from 34,324 votes, as of Oct 22, 2026.
Is GPT-5.3 Chat open source?
No. GPT-5.3 Chat is proprietary and served through its provider’s API.