AI21 Labs model product
Jamba 1.5 Large
5 Large is a hybrid SSM-Transformer instruction-following foundation model from AI21 Labs.
Updated Sep 8, 2026. Default version: Jamba 1.5 Large
LLMBoard Score0.8Jamba 1.5 Large
Coverage40%8 benchmark families
Context window256KTokens
Official input priceN/AOfficial price unavailable
Jamba 1.5 Large Capability Profile
This profile uses the model's current scored version. Arena ratings and prices are shown separately.
Jamba 1.5 Large Benchmark Results
Benchmark scores for Jamba 1.5 Large.
Sort by
Benchmark | Score | Rank | Participants | Percentile | Evidence | Evaluated |
|---|
| BenchmarkARC-C | Score93.00% | Rank07 | Participants34 | Percentile81.82% | EvidenceC | Evaluated |
| BenchmarkWild Bench | Score48.50% | Rank07 | Participants8 | Percentile14.29% | EvidenceC | Evaluated |
| BenchmarkTruthfulQA | Score58.30% | Rank09 | Participants18 | Percentile52.94% | EvidenceC | Evaluated |
| BenchmarkArena Hard | Score65.40% | Rank12 | Participants26 | Percentile56.00% | EvidenceC | Evaluated |
| BenchmarkGSM8k | Score87.00% | Rank33 | Participants48 | Percentile31.91% | EvidenceC | Evaluated |
| BenchmarkMMLU | Score81.20% | Rank53 | Participants101 | Percentile48.00% | EvidenceC | Evaluated |
| BenchmarkMMLU-Pro | Score53.50% | Rank118 | Participants138 | Percentile14.60% | EvidenceC | Evaluated |
| BenchmarkLM Arena Text Style Control | Score1,289.09 rating | Rank186 | Participants210 | Percentile11.48% | EvidenceA | Evaluated |
| BenchmarkLM Arena Text | Score1,236.80 rating | Rank187 | Participants210 | Percentile11.00% | EvidenceA | Evaluated |
| BenchmarkGPQA | Score36.90% | Rank223 | Participants247 | Percentile9.76% | EvidenceC | Evaluated |
Jamba 1.5 Large Arena Results
Preference and agent-evaluation results for the default version.
Sort by
Arena | Category | Rank | Rating / score | Votes | Observations | Result date |
|---|
| Arenatext style control | Categoryjapanese | Rank161 | Rating / score1,178.02 | Votes242 | ObservationsN/A | Result date |
| Arenatext | Categoryjapanese | Rank164 | Rating / score1,118.22 | Votes242 | ObservationsN/A | Result date |
| Arenatext style control | Categorygerman | Rank168 | Rating / score1,253.06 | Votes234 | ObservationsN/A | Result date |
| Arenatext | Categorygerman | Rank169 | Rating / score1,199.56 | Votes234 | ObservationsN/A | Result date |
| Arenatext style control | Categoryindustry legal and government | Rank176 | Rating / score1,325.97 | Votes448 | ObservationsN/A | Result date |
| Arenatext style control | Categoryindustry entertainment and sports and media | Rank179 | Rating / score1,270.01 | Votes1,433 | ObservationsN/A | Result date |
| Arenatext style control | Categoryexpert | Rank180 | Rating / score1,284.62 | Votes331 | ObservationsN/A | Result date |
| Arenatext | Categoryindustry legal and government | Rank182 | Rating / score1,264.19 | Votes448 | ObservationsN/A | Result date |
| Arenatext style control | Categorychinese | Rank182 | Rating / score1,277.69 | Votes675 | ObservationsN/A | Result date |
| Arenatext style control | Categorycreative writing | Rank182 | Rating / score1,260.83 | Votes1,379 | ObservationsN/A | Result date |
| Arenatext style control | Categoryindustry writing and literature and language | Rank182 | Rating / score1,276.35 | Votes2,350 | ObservationsN/A | Result date |
| Arenatext | Categoryexpert | Rank183 | Rating / score1,217.72 | Votes331 | ObservationsN/A | Result date |
| Arenatext | Categoryindustry mathematical | Rank184 | Rating / score1,227.48 | Votes962 | ObservationsN/A | Result date |
| Arenatext | Categorymath | Rank184 | Rating / score1,221.02 | Votes1,147 | ObservationsN/A | Result date |
| Arenatext style control | Categoryenglish | Rank184 | Rating / score1,315.18 | Votes4,915 | ObservationsN/A | Result date |
| Arenatext style control | Categoryindustry life and physical and social science | Rank184 | Rating / score1,313.53 | Votes1,358 | ObservationsN/A | Result date |
| Arenatext | Categoryindustry entertainment and sports and media | Rank185 | Rating / score1,218.09 | Votes1,433 | ObservationsN/A | Result date |
| Arenatext | Categoryindustry life and physical and social science | Rank185 | Rating / score1,249.34 | Votes1,358 | ObservationsN/A | Result date |
| Arenatext style control | Categoryindustry mathematical | Rank185 | Rating / score1,257.25 | Votes962 | ObservationsN/A | Result date |
| Arenatext style control | Categorymath | Rank185 | Rating / score1,244.82 | Votes1,147 | ObservationsN/A | Result date |
| Arenatext | Categoryenglish | Rank186 | Rating / score1,266.63 | Votes4,915 | ObservationsN/A | Result date |
| Arenatext style control | Categoryoverall | Rank186 | Rating / score1,289.09 | Votes8,662 | ObservationsN/A | Result date |
| Arenatext | Categoryexclude ties | Rank187 | Rating / score1,139.18 | Votes5,535 | ObservationsN/A | Result date |
| Arenatext | Categoryoverall | Rank187 | Rating / score1,236.80 | Votes8,662 | ObservationsN/A | Result date |
| Arenatext style control | Categoryexclude ties | Rank187 | Rating / score1,213.10 | Votes5,535 | ObservationsN/A | Result date |
| Arenatext | Categoryindustry writing and literature and language | Rank188 | Rating / score1,227.29 | Votes2,350 | ObservationsN/A | Result date |
| Arenatext style control | Categorycoding | Rank188 | Rating / score1,312.11 | Votes1,440 | ObservationsN/A | Result date |
| Arenatext style control | Categoryhard prompts english | Rank188 | Rating / score1,293.51 | Votes1,528 | ObservationsN/A | Result date |
| Arenatext style control | Categoryindustry software and it services | Rank188 | Rating / score1,309.69 | Votes2,339 | ObservationsN/A | Result date |
| Arenatext | Categorycreative writing | Rank189 | Rating / score1,211.55 | Votes1,379 | ObservationsN/A | Result date |
Jamba 1.5 Large Pricing
Official vendor API pricing appears first, followed by individual provider offers.
- Official API
- N/A
- Official provider
- N/A
- Lowest third-party
- N/A
- Tracked offerings
- 0
No provider prices
The default version has no current input or output token prices.
Official prices use only the vendor's configured official Provider and positive standard USD PAYG rates. Third-party offers remain explicitly labeled.
Jamba 1.5 Large Runtime Performance
Provider-specific output speed and catalog latency for Jamba 1.5 Large. Runtime does not affect the capability score.
Sort by
Provider | Output Speed | Catalog Latency | Max Input | Max Output | Updated |
|---|
| ProviderGoogle | Output Speed42.00 tok/s | Catalog Latency0.30 s | Max Input256K | Max Output256K | Updated |
Output Speed is generated output tokens received per second. Catalog latency is reported separately from observed provider TTFT.
Jamba 1.5 Large Specifications
Technical details for the model's default version.
- Version
- Jamba 1.5 Large
- Released
- Aug 22, 2024
- Knowledge cutoff
- Mar 5, 2024
- Parameters
- 398B
- Context window
- 256K
- Max output
- 256K
- Inputs
- text
- Outputs
- text
- Open weights
- Yes
- License
- Jamba Open Model License
Jamba 1.5 Large Versions
Available versions of this model. The score column identifies the version used in the overall ranking.
Sort by
Version | Released | LLMBoard | Parameters | Context | Max output | Open weights | License |
|---|
| VersionJamba 1.5 Large | Released | LLMBoard0.78 | Parameters398B | Context256K | Max output256K | Open weightsYes | LicenseJamba Open Model License |
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What is Jamba 1.5 Large?
Key information about Jamba 1.5 Large and its available data.
5 Large is an instruction-following foundation model from AI21 Labs that combines state space model (SSM) and Transformer architectures.
Data as of 2026-09-08.
FAQ
Common questions about Jamba 1.5 Large.
When was Jamba 1.5 Large released?
Jamba 1.5 Large's default version was released on Aug 22, 2024.
How much does Jamba 1.5 Large cost?
No official standard PAYG price is currently available for Jamba 1.5 Large.
Who created Jamba 1.5 Large?
Jamba 1.5 Large was created by AI21 Labs.
What is the context window for Jamba 1.5 Large?
The default version has a 256K token context window.
Is Jamba 1.5 Large open weight?
Yes. The default version is marked as open weight under Jamba Open Model License.
How many API providers offer Jamba 1.5 Large?
No provider offering is currently linked to the default version.