Verified claim · AI-ML · 100% confidence
AI21 Jamba publicly released on: 2024-03-28 by AI21 Labs — first production-grade hybrid SSM-Transformer (Mamba + Transformer) model, 52B/12B active.
Last verified 2026-05-16 · Methodology veritas-v0.1 · 4bacee2c8f1f004c
Structured fields
- Subject
- AI21 Jamba
- Predicate
publicly_released_on- Object
- 2024-03-28 by AI21 Labs — first production-grade hybrid SSM-Transformer (Mamba + Transformer) model, 52B/12B active
- Confidence
- 100%
- Tags
- jamba · ai21 · ssm-transformer · mamba · hybrid-architecture · released_on · 2024
Sources (2)
[1] official blog · AI21 Labs · 2024-03-28
Announcing Jamba: AI21's Groundbreaking SSM-Transformer Model“Jamba is the world's first production-grade Mamba-based model and the first to combine Mamba's Structured State Space model (SSM) with Transformer architecture.”
[2] model card · AI21 Labs / Hugging Face · 2024-03-28
Jamba-v0.1 on Hugging Face
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AI21 Jamba publicly released on: 2024-03-28 by AI21 Labs — first production-grade hybrid SSM-Transformer (Mamba + Transformer) model, 52B/12B active. — SourceScore Claim 4bacee2c8f1f004c (verified 2026-05-16). https://sourcescore.org/api/v1/claims/4bacee2c8f1f004c.jsonEmbed this claim
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Frequently asked questions
Is the claim "AI21 Jamba publicly released on: 2024-03-28 by AI21 Labs — first production-grade hybrid SSM-Transformer (Mamba + Transformer) model, 52B/12B active." verified?
Yes — SourceScore verified this claim with 100% confidence as of 2026-05-16. The verification uses 2 primary sources cross-referenced against the SourceScore methodology (version veritas-v0.1). Full source list + signed JSON envelope linked below.
What is the evidence for "AI21 Jamba publicly released on: 2024-03-28 by AI21 Labs — first production-grade hybrid SSM-Transformer (Mamba + Transformer) model, 52B/12B active."?
Evidence comes from 2 primary sources: AI21 Labs, AI21 Labs / Hugging Face. Each source is listed below with verbatim excerpts and URLs. The signed JSON envelope at https://sourcescore.org/api/v1/claims/4bacee2c8f1f004c.json includes an HMAC-SHA256 signature for audit verification.
When was this claim last verified by SourceScore?
Last verified 2026-05-16 under methodology version veritas-v0.1. The signed JSON envelope is dated and cryptographically signed for audit trail. Re-verification cadence depends on the claim type and source freshness.
How can I cite this SourceScore claim in my code or article?
Fetch the signed JSON envelope from https://sourcescore.org/api/v1/claims/4bacee2c8f1f004c.json which includes the verbatim claim, primary sources, confidence, methodology version, last-verified date, and HMAC-SHA256 signature for audit. The CC-BY-4.0 license permits commercial use with attribution to SourceScore.
Use this claim in your code
Fetch this signed envelope from your application. The response includes the verbatim excerpt, primary source URLs, and an HMAC-SHA256 signature you can verify locally for audit trails.
cURL
curl https://sourcescore.org/api/v1/claims/4bacee2c8f1f004c.jsonJavaScript / TypeScript
const r = await fetch("https://sourcescore.org/api/v1/claims/4bacee2c8f1f004c.json");
const envelope = await r.json();
console.log(envelope.claim.statement);
// "AI21 Jamba publicly released on: 2024-03-28 by AI21 Labs — first production-grade hybrid SSM-Transformer (Mamba + Transformer) model, 52B/12B active."Python
import httpx
r = httpx.get("https://sourcescore.org/api/v1/claims/4bacee2c8f1f004c.json")
envelope = r.json()
print(envelope["claim"]["statement"])
# "AI21 Jamba publicly released on: 2024-03-28 by AI21 Labs — first production-grade hybrid SSM-Transformer (Mamba + Transformer) model, 52B/12B active."LangChain (retrieve-then-cite)
from langchain_core.tools import tool
import httpx
@tool
def get_ai21_jamba_fact() -> dict:
"""Fetch the verified SourceScore claim for AI21 Jamba."""
r = httpx.get("https://sourcescore.org/api/v1/claims/4bacee2c8f1f004c.json")
return r.json()