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Step 5 PreviewBeam 1.0 501B A23B
Beam 1.0 501B A23B is an open-weight model from Reflection AI, released Oct 16, 2026. It ranks #103 of 351 on the LMArena text leaderboard with a rating of 1426. It costs $0.25 per million input tokens and $1 per million output tokens, with a 1M-token context window.
- Developer
- Reflection AI
- Released
- Oct 16, 2026
- Context window
- 1M
- Price in / out, per 1M tokens
- $0.25 / $1
- Weights
- Open · Apache 2.0
- Inputs
- Text
- Reasoning
- Yes
- Tool use
- Yes
- Hugging Face downloads, 30 days
- 5.2K
- Hugging Face likes
- 254
LMArena, by category
| Leaderboard | Rating | Rank | Votes |
|---|---|---|---|
| TextLMArena | 1426 | 103 / 351 | 4.2K |
| CodingLMArena | 1472 | 65 / 346 | 1K |
| MathLMArena | 1460 | 59 / 339 | 237 |
| Creative writingLMArena | 1391 | 114 / 349 | 968 |
| Instruction followingLMArena | 1431 | 73 / 351 | 1.6K |
| Hard promptsLMArena | 1442 | 93 / 351 | 2.7K |
| Multi-turnLMArena | 1416 | 124 / 349 | 677 |
| Long queriesLMArena | 1429 | 92 / 330 | 1.9K |
| ExpertLMArena | 1447 | 86 / 305 | 387 |
| Legal and governmentIndustries | 1431 | 105 / 325 | 349 |
| Medicine and healthcareIndustries | 1378 | 185 / 325 | 308 |
| Business and financeIndustries | 1430 | 81 / 344 | 738 |
| ChineseLanguages | 1428 | 154 / 328 | 205 |
| FrenchLanguages | 1461 | 63 / 252 | 257 |
| WebDevLMArena | 1436 | 84 / 124 | 2.9K |
LMArena, CC BY 4.0, as of Oct 22, 2026. Where a model is rated at several effort levels, its best is shown.
Compare Beam 1.0 501B A23B
Reflection AI
Questions
Who makes Beam 1.0 501B A23B?
Beam 1.0 501B A23B is made by Reflection AI.
How much does Beam 1.0 501B A23B cost?
$0.25 per million input tokens and $1 per million output tokens, at its provider’s list price.
What is Beam 1.0 501B A23B’s context window?
1M tokens (1,048,576).
How does Beam 1.0 501B A23B rank?
#103 of 351 on LMArena’s text leaderboard, rated 1426 (95% interval 1416–1435) from 4,237 votes, as of Oct 22, 2026.
Is Beam 1.0 501B A23B open source?
Beam 1.0 501B A23B has open weights under the Apache 2.0 license, downloadable from Hugging Face (reflection/Beam-1.0-501B-A23B).