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Step 5 Preview
Jamba 1.5 Large
Jamba 1.5 Large is an open-weight model from AI21 Labs. It ranks #300 of 351 on the LMArena text leaderboard with a rating of 1237.
LMArena text1237+0 in 30 days
Rank#300/351
95% interval1230–1244
Votes8.7K
- Developer
- AI21 Labs
- Released
- Aug 22, 2024
- Context window
- —
- Price in / out, per 1M tokens
- —
- Weights
- Open · Jamba Open
- Inputs
- —
- Reasoning
- —
- Tool use
- —
LatestJamba 1.5 Large 1237
The rating LMArena published at each update since Aug 22, 2024. Ratings move as votes come in and new models join.
Benchmarks
| Benchmark | Score bar | Accuracy | Rank | Cost / test |
|---|---|---|---|---|
| MedQAMedicine | 68.11% | 82 / 92 | $2 / $8 |
Vals AI, as of Oct 24, 2026.
LMArena, by category
| Leaderboard | Rating | Rank | Votes |
|---|---|---|---|
| TextLMArena | 1237 | 300 / 351 | 8.7K |
| CodingLMArena | 1227 | 306 / 346 | 1.4K |
| MathLMArena | 1221 | 298 / 339 | 1.1K |
| Creative writingLMArena | 1212 | 300 / 349 | 1.4K |
| Instruction followingLMArena | 1213 | 300 / 351 | 3.3K |
| Hard promptsLMArena | 1218 | 304 / 351 | 2.4K |
| Multi-turnLMArena | 1220 | 305 / 349 | 1.6K |
| Long queriesLMArena | 1206 | 314 / 330 | 1K |
| ExpertLMArena | 1218 | 281 / 305 | 331 |
| Legal and governmentIndustries | 1264 | 286 / 325 | 448 |
| Medicine and healthcareIndustries | 1196 | 305 / 325 | 474 |
| Business and financeIndustries | 1196 | 310 / 344 | 979 |
| ChineseLanguages | 1203 | 309 / 328 | 675 |
| GermanLanguages | 1200 | 255 / 261 | 234 |
| JapaneseLanguages | 1118 | 246 / 236 | 242 |
LMArena, CC BY 4.0, as of Oct 22, 2026. Where a model is rated at several effort levels, its best is shown.
Compare Jamba 1.5 Large
AI21 Labs
Builds Jamba, hybrid Transformer and state-space models with long context. Founded 2017, based in Tel Aviv. ai21.com
Questions
Who makes Jamba 1.5 Large?
Jamba 1.5 Large is made by AI21 Labs, founded 2017 and based in Tel Aviv.
How does Jamba 1.5 Large rank?
#300 of 351 on LMArena’s text leaderboard, rated 1237 (95% interval 1230–1244) from 8,662 votes, as of Oct 22, 2026.
Is Jamba 1.5 Large open source?
Jamba 1.5 Large has open weights under the Jamba Open license.