Model Comparison

Grok-1.5 vs Jamba 1.5 MiniWhich is better in 2026?

Grok-1.5 significantly outperforms across most benchmarks.

Verdict: Grok-1.5 vs Jamba 1.5 Mini — which is better?

Grok-1.5 (by xAI) and Jamba 1.5 Mini (by AI21 Labs) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.

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.

Choose Grok-1.5 if…

  • you want the strongest raw capability — it leads on 4 of 4 shared benchmarks

Choose Jamba 1.5 Mini if…

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

Performance Benchmarks

Comparative analysis across standard metrics

4 benchmarks

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.

Fri Jul 03 2026 • llm-stats.com

Arena Performance

Human preference votes

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
Fri Jul 03 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

2.3 years ago

Jamba 1.5 Mini

Aug 22, 2024

1.9 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→

Key Takeaways

xAI
Higher GPQA score (35.9% vs 32.3%)
Higher GSM8k score (90.0% vs 75.8%)
Higher MMLU score (81.3% vs 69.7%)
Higher MMLU-Pro score (51.0% vs 42.5%)
AI21 Labs
Larger context window (256,144 tokens)
Has open weights

Detailed Comparison

Interactive Arena

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
AI Model Comparison Table
Feature
xAI
Grok-1.5
AI21 Labs
Jamba 1.5 Mini

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 significantly outperforms across most benchmarks. 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 benchmark scores, pricing, and capabilities 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 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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