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Gemini 1.5 Flash 8B vs Grok-1.5

Gemini 1.5 Flash 8B and Grok-1.5 are closely matched at -0.2 and -2.0 on the LLM Stats Score.

Google · xAI · Updated for 2026

Which is better?

Gemini 1.5 Flash 8B and Grok-1.5 are closely matched on the overall LLM Stats Score at -0.2 and -2.0.

In the 5 individual benchmarks reported for both models, Gemini 1.5 Flash 8B wins 5; 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 Gemini 1.5 Flash 8B

  • you value its reported benchmark strengths — it wins 5 of 5 exact shared results

Choose Grok-1.5

  • you want the most recent training data — it shipped Mar 2024

At a glance

The differences that matter most.

Gemini 1.5 Flash 8B
Google
Grok-1.5
xAI
Core performance indexes
LLM Stats Score
-0.2
#309
-2.0
#317
Reasoning
0.2
#299
-1.5
#309
Cost, coverage & limits
Benchmark wins
5 of 5
0 of 5
Input price
$0.07 / M
— / M
Output price
$0.30 / M
— / M
Context window
1,048,576
—

Capability indexes

Additional strengths measured across groups of related public benchmarks

3 shared
Index
Gemini 1.5 Flash 8B
Grok-1.5
Math
2.8#277
5.5#260
Vision
-2.0#181
-4.7#192
Multimodal
0.7#143
-2.2#151
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

13 reported for Gemini 1.5 Flash 8B · 9 for Grok-1.5

5 shared

Gemini 1.5 Flash 8B outperforms in 5 benchmarks (GPQA, MATH, MathVista, MMLU-Pro, MMMU), while Grok-1.5 is better at 0 benchmarks.

Gemini 1.5 Flash 8B significantly outperforms across most benchmarks.

Fri Aug 28 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Context Window

Maximum input and output token capacity

Only Gemini 1.5 Flash 8B specifies input context (1,048,576 tokens). Only Gemini 1.5 Flash 8B specifies output context (8,192 tokens).

Google
Gemini 1.5 Flash 8B
Input1,048,576 tokens
Output8,192 tokens
xAI
Grok-1.5
Input- tokens
Output- tokens
Fri Aug 28 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Gemini 1.5 Flash 8B supports multimodal inputs, whereas Grok-1.5 does not.

Gemini 1.5 Flash 8B can handle both text and other forms of data like images, making it suitable for multimodal applications.

Gemini 1.5 Flash 8B

Text
Images
Audio
Video

Grok-1.5

Text
Images
Audio
Video

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

Gemini 1.5 Flash 8B

Proprietary

Closed source

Grok-1.5

Proprietary

Closed source

Release Timeline

When each model was launched

Gemini 1.5 Flash 8B was released on 2024-03-15, while Grok-1.5 was released on 2024-03-28.

Grok-1.5 is 0 month newer than Gemini 1.5 Flash 8B.

Gemini 1.5 Flash 8B

Mar 15, 2024

2.5 years ago

Grok-1.5

Mar 28, 2024

2.4 years ago

1w newer

Knowledge Cutoff

When training data ends

Gemini 1.5 Flash 8B has a documented knowledge cutoff of 2024-10-01, while Grok-1.5's cutoff date is not specified.

We can confirm Gemini 1.5 Flash 8B's training data extends to 2024-10-01, but cannot make a direct comparison without Grok-1.5's cutoff date.

Gemini 1.5 Flash 8B

Oct 2024

Grok-1.5

—

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against Gemini 1.5 Flash 8B and Grok-1.5 side-by-side, then vote on the output you prefer.

Gemini 1.5 Flash 8B
✓ Preferred
Grok-1.5
Open in Playground

FAQ

Common questions about Gemini 1.5 Flash 8B vs Grok-1.5.

Which is better, Gemini 1.5 Flash 8B or Grok-1.5?

Gemini 1.5 Flash 8B and Grok-1.5 are closely matched on the LLM Stats Score at -0.2 and -2.0. Gemini 1.5 Flash 8B is made by Google and Grok-1.5 is made by xAI. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Gemini 1.5 Flash 8B compare to Grok-1.5 in benchmarks?

Gemini 1.5 Flash 8B scores XSTest: 92.6%, FLEURS: 86.4%, Natural2Code: 75.5%, WMT23: 72.6%, Video-MME: 66.2%. Grok-1.5 scores GSM8k: 90.0%, DocVQA: 85.6%, MMLU: 81.3%, HumanEval: 74.1%, MMMU: 53.6%.

What are the context window sizes for Gemini 1.5 Flash 8B and Grok-1.5?

Gemini 1.5 Flash 8B supports 1.0M tokens and Grok-1.5 supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Gemini 1.5 Flash 8B and Grok-1.5?

Key differences include LLM Stats Score (-0.2 vs -2.0), multimodal support (yes vs no). See the full comparison above for benchmark-by-benchmark results.

Who makes Gemini 1.5 Flash 8B and Grok-1.5?

Gemini 1.5 Flash 8B is developed by Google and Grok-1.5 is developed by xAI.

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