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Step 5 Preview
Reka Flash 21B
Reka Flash 21B is a proprietary model from Reka. It ranks #335 of 351 on the LMArena text leaderboard with a rating of 1170.
- Developer
- Reka
- Released
- Apr 18, 2024
- Context window
- —
- Price in / out, per 1M tokens
- —
- Weights
- Proprietary
- Inputs
- —
- Reasoning
- —
- Tool use
- —
The rating LMArena published at each update since Apr 18, 2024. Ratings move as votes come in and new models join.
LMArena, by category
| Leaderboard | Rating | Rank | Votes |
|---|---|---|---|
| TextLMArena | 1170 | 335 / 351 | 15.5K |
| CodingLMArena | 1164 | 336 / 346 | 2.9K |
| MathLMArena | 1168 | 326 / 339 | 2K |
| Creative writingLMArena | 1130 | 341 / 349 | 2.1K |
| Instruction followingLMArena | 1129 | 341 / 351 | 5.6K |
| Hard promptsLMArena | 1137 | 342 / 351 | 4.5K |
| Multi-turnLMArena | 1151 | 336 / 349 | 2K |
| Long queriesLMArena | 1141 | 343 / 330 | 2.7K |
| ExpertLMArena | 1116 | 328 / 305 | 830 |
| Legal and governmentIndustries | 1194 | 318 / 325 | 876 |
| Medicine and healthcareIndustries | 1147 | 322 / 325 | 1.3K |
| Business and financeIndustries | 1135 | 334 / 344 | 1.7K |
| ChineseLanguages | 1143 | 330 / 328 | 2K |
| SpanishLanguages | 1149 | 276 / 249 | 217 |
| GermanLanguages | 1153 | 273 / 261 | 798 |
| FrenchLanguages | 1175 | 265 / 252 | 430 |
| JapaneseLanguages | 1075 | 253 / 236 | 274 |
LMArena, CC BY 4.0, as of Oct 22, 2026. Where a model is rated at several effort levels, its best is shown (Reka Flash 21B (Online, 20240226), Reka Flash 21B (20240226)).
Compare Reka Flash 21B
Reka
Builds multimodal models that understand text, images, video and audio. Founded 2022, based in Sunnyvale. reka.ai
Questions
Who makes Reka Flash 21B?
Reka Flash 21B is made by Reka, founded 2022 and based in Sunnyvale.
How does Reka Flash 21B rank?
#335 of 351 on LMArena’s text leaderboard, rated 1170 (95% interval 1163–1178) from 15,450 votes, as of Oct 22, 2026.
Is Reka Flash 21B open source?
No. Reka Flash 21B is proprietary and served through its provider’s API.