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Step 5 Preview
Jamba 1.5 Mini
Jamba 1.5 Mini is an open-weight model from AI21 Labs. It ranks #328 of 351 on the LMArena text leaderboard with a rating of 1187.
LMArena text1187
Rank#328/351
95% interval1180–1194
Votes8.9K
- 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 Mini 1187
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 | 55.18% | 86 / 92 | $0.2 / $0.4 |
Vals AI, as of Oct 24, 2026.
LMArena, by category
| Leaderboard | Rating | Rank | Votes |
|---|---|---|---|
| TextLMArena | 1187 | 328 / 351 | 8.9K |
| CodingLMArena | 1178 | 329 / 346 | 1.4K |
| MathLMArena | 1160 | 329 / 339 | 1.1K |
| Creative writingLMArena | 1164 | 327 / 349 | 1.4K |
| Instruction followingLMArena | 1148 | 335 / 351 | 3.3K |
| Hard promptsLMArena | 1167 | 330 / 351 | 2.4K |
| Multi-turnLMArena | 1157 | 332 / 349 | 1.6K |
| Long queriesLMArena | 1156 | 336 / 330 | 1K |
| ExpertLMArena | 1136 | 321 / 305 | 332 |
| Legal and governmentIndustries | 1224 | 308 / 325 | 531 |
| Medicine and healthcareIndustries | 1181 | 313 / 325 | 486 |
| Business and financeIndustries | 1157 | 325 / 344 | 1K |
| ChineseLanguages | 1136 | 334 / 328 | 711 |
| GermanLanguages | 1162 | 270 / 261 | 248 |
| JapaneseLanguages | 1019 | 265 / 236 | 270 |
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 Mini
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 Mini?
Jamba 1.5 Mini is made by AI21 Labs, founded 2017 and based in Tel Aviv.
How does Jamba 1.5 Mini rank?
#328 of 351 on LMArena’s text leaderboard, rated 1187 (95% interval 1180–1194) from 8,858 votes, as of Oct 22, 2026.
Is Jamba 1.5 Mini open source?
Jamba 1.5 Mini has open weights under the Jamba Open license.