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Grok-1.5 vs Jamba 1.5 Mini

Grok-1.5 and Jamba 1.5 Mini are closely matched at -2.4 and -5.5 on the LLM Stats Score.

xAI · AI21 Labs · Updated for 2026

Which is better?

Grok-1.5 and Jamba 1.5 Mini are closely matched on the overall LLM Stats Score at -2.4 and -5.5.

In the 4 individual benchmarks reported for both models, Grok-1.5 wins 4; this is a narrower head-to-head signal than the composite indexes.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose Grok-1.5

  • you value its reported benchmark strengths — it wins 4 of 4 exact shared results

Choose Jamba 1.5 Mini

  • you want the most recent training data — it shipped Aug 2024
  • you need open weights you can self-host or fine-tune

At a glance

The differences that matter most.

Grok-1.5
xAI
Jamba 1.5 Mini
AI21 Labs
Core performance indexes
LLM Stats Score
-2.4
#324
-5.5
#343
Reasoning
-1.9
#315
-5.4
#334
Cost, coverage & limits
Benchmark wins
4 of 4
0 of 4
Input price
— / M
$0.20 / M
Output price
— / M
$0.40 / M
Context window
—
256,144

Capability indexes

Additional strengths measured across groups of related public benchmarks

3 shared
Index
Grok-1.5
Jamba 1.5 Mini
Math
5.4#265
-3.6#305
Finance
5.2#164
-3.4#198
Legal
5.2#149
-3.4#184
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

9 reported for Grok-1.5 · 8 for Jamba 1.5 Mini

4 shared

Grok-1.5 outperforms in 4 benchmarks (GPQA, GSM8k, MMLU, MMLU-Pro), while Jamba 1.5 Mini is better at 0 benchmarks.

Grok-1.5 significantly outperforms across most benchmarks.

Wed Sep 02 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Context Window

Maximum input and output token capacity

Only Jamba 1.5 Mini specifies input context (256,144 tokens). Only Jamba 1.5 Mini specifies output context (256,144 tokens).

xAI
Grok-1.5
Input- tokens
Output- tokens
AI21 Labs
Jamba 1.5 Mini
Input256,144 tokens
Output256,144 tokens
Wed Sep 02 2026 • llm-stats.com

License

Usage and distribution terms

Grok-1.5 is licensed under a proprietary license, while Jamba 1.5 Mini uses Jamba Open Model License.

License differences may affect how you can use these models in commercial or open-source projects.

Grok-1.5

Proprietary

Closed source

Jamba 1.5 Mini

Jamba Open Model License

Open weights

Release Timeline

When each model was launched

Grok-1.5 was released on 2024-03-28, while Jamba 1.5 Mini was released on 2024-08-22.

Jamba 1.5 Mini is 5 months newer than Grok-1.5.

Grok-1.5

Mar 28, 2024

2.4 years ago

Jamba 1.5 Mini

Aug 22, 2024

2.0 years ago

4mo newer

Knowledge Cutoff

When training data ends

Jamba 1.5 Mini has a documented knowledge cutoff of 2024-03-05, while Grok-1.5's cutoff date is not specified.

We can confirm Jamba 1.5 Mini's training data extends to 2024-03-05, but cannot make a direct comparison without Grok-1.5's cutoff date.

Grok-1.5

—

Jamba 1.5 Mini

Mar 2024

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against Grok-1.5 and Jamba 1.5 Mini side-by-side, then vote on the output you prefer.

Grok-1.5
✓ Preferred
Jamba 1.5 Mini
Open in Playground

FAQ

Common questions about Grok-1.5 vs Jamba 1.5 Mini.

Which is better, Grok-1.5 or Jamba 1.5 Mini?

Grok-1.5 and Jamba 1.5 Mini are closely matched on the LLM Stats Score at -2.4 and -5.5. Grok-1.5 is made by xAI and Jamba 1.5 Mini is made by AI21 Labs. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Grok-1.5 compare to Jamba 1.5 Mini in benchmarks?

Grok-1.5 scores GSM8k: 90.0%, DocVQA: 85.6%, MMLU: 81.3%, HumanEval: 74.1%, MMMU: 53.6%. Jamba 1.5 Mini scores ARC-C: 85.7%, GSM8k: 75.8%, MMLU: 69.7%, TruthfulQA: 54.1%, Arena Hard: 46.1%.

What are the context window sizes for Grok-1.5 and Jamba 1.5 Mini?

Grok-1.5 supports an unknown number of tokens and Jamba 1.5 Mini supports 256K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Grok-1.5 and Jamba 1.5 Mini?

Key differences include LLM Stats Score (-2.4 vs -5.5), licensing (Proprietary vs Jamba Open Model License). See the full comparison above for benchmark-by-benchmark results.

Who makes Grok-1.5 and Jamba 1.5 Mini?

Grok-1.5 is developed by xAI and Jamba 1.5 Mini is developed by AI21 Labs.

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