Model Comparison

Gemini 3.5 Flash vs Grok 4.3Which is better in 2026?

Gemini 3.5 Flash significantly outperforms across most benchmarks. Grok 4.3 is 2.2x cheaper per token.

Verdict: Gemini 3.5 Flash vs Grok 4.3 — which is better?

Gemini 3.5 Flash (by Google) and Grok 4.3 (by xAI) 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.

Gemini 3.5 Flash outperforms in 2 benchmarks (Finance Agent v2, GDPval-AA), while Grok 4.3 is better at 0 benchmarks. Gemini 3.5 Flash significantly outperforms across most benchmarks.

On price, Grok 4.3 is roughly 2.2x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Gemini 3.5 Flash also accepts a larger context window (1,048,576 input tokens), making it the stronger choice for long documents and large codebases.

Choose Gemini 3.5 Flash if…

  • you want the strongest raw capability — it leads on 2 of 2 shared benchmarks
  • you process long inputs — it offers a 1,048,576 token context window
  • you want the most recent training data — it shipped May 2026

Choose Grok 4.3 if…

  • cost matters — it's about 2.2x cheaper per token

Performance Benchmarks

Comparative analysis across standard metrics

2 benchmarks

Gemini 3.5 Flash outperforms in 2 benchmarks (Finance Agent v2, GDPval-AA), while Grok 4.3 is better at 0 benchmarks.

Gemini 3.5 Flash significantly outperforms across most benchmarks.

Fri Jul 17 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Grok 4.3 costs less

For input processing, Gemini 3.5 Flash ($1.50/1M tokens) is 1.2x more expensive than Grok 4.3 ($1.25/1M tokens).

For output processing, Gemini 3.5 Flash ($9.00/1M tokens) is 3.6x more expensive than Grok 4.3 ($2.50/1M tokens).

In conclusion, Gemini 3.5 Flash is more expensive than Grok 4.3.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers
Fri Jul 17 2026 • llm-stats.com
Google
Gemini 3.5 Flash
Input tokens$1.50
Output tokens$9.00
Best providerGoogle
xAI
Grok 4.3
Input tokens$1.25
Output tokens$2.50
Best providerxAI
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Gemini 3.5 Flash accepts 1,048,576 input tokens compared to Grok 4.3's 1,000,000 tokens. Only Gemini 3.5 Flash specifies output context (65,536 tokens).

Google
Gemini 3.5 Flash
Input1,048,576 tokens
Output65,536 tokens
xAI
Grok 4.3
Input1,000,000 tokens
Output- tokens
Fri Jul 17 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Gemini 3.5 Flash supports multimodal inputs, whereas Grok 4.3 does not.

Gemini 3.5 Flash can handle both text and other forms of data like images, making it suitable for multimodal applications.

Gemini 3.5 Flash

Text
Images
Audio
Video

Grok 4.3

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 3.5 Flash

Proprietary

Closed source

Grok 4.3

Proprietary

Closed source

Release Timeline

When each model was launched

Gemini 3.5 Flash was released on 2026-05-19, while Grok 4.3 was released on 2026-05-06.

Gemini 3.5 Flash is 0 month newer than Grok 4.3.

Gemini 3.5 Flash

May 19, 2026

1 months ago

1w newer
Grok 4.3

May 6, 2026

2 months ago

Knowledge Cutoff

When training data ends

Gemini 3.5 Flash has a documented knowledge cutoff of 2026-01-31, while Grok 4.3's cutoff date is not specified.

We can confirm Gemini 3.5 Flash's training data extends to 2026-01-31, but cannot make a direct comparison without Grok 4.3's cutoff date.

Gemini 3.5 Flash

Jan 2026

Grok 4.3

—

Provider Availability

Gemini 3.5 Flash is available from Google. Grok 4.3 is available from xAI.

Gemini 3.5 Flash

google logo
Google
Input Price:Input: $1.50/1MOutput Price:Output: $9.00/1M

Grok 4.3

xai logo
xAI
Input Price:Input: $1.25/1MOutput Price:Output: $2.50/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

Google
Larger context window (1,048,576 tokens)
Supports multimodal inputs
Higher Finance Agent v2 score (57.9% vs 37.7%)
Higher GDPval-AA score (45.7% vs 36.7%)
xAI
Less expensive input tokens
Less expensive output tokens

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against Gemini 3.5 Flash and Grok 4.3 side-by-side, then vote on the output you prefer.

Gemini 3.5 Flash
✓ Preferred
Grok 4.3
Open in Playground
AI Model Comparison Table
Feature
Google
Gemini 3.5 Flash
xAI
Grok 4.3

FAQ

Common questions about Gemini 3.5 Flash vs Grok 4.3.

Which is better, Gemini 3.5 Flash or Grok 4.3?

Gemini 3.5 Flash significantly outperforms across most benchmarks. Gemini 3.5 Flash is made by Google and Grok 4.3 is made by xAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Gemini 3.5 Flash compare to Grok 4.3 in benchmarks?

Gemini 3.5 Flash scores CharXiv-R: 84.2%, MCP Atlas: 83.6%, MMMU-Pro: 83.6%, OSWorld-Verified: 78.4%, Terminal-Bench 2.0: 76.2%. Grok 4.3 scores Finance Agent v2: 37.7%, GDPval-AA: 36.7%.

Is Gemini 3.5 Flash cheaper than Grok 4.3?

Grok 4.3 is 1.2x cheaper for input tokens. Gemini 3.5 Flash costs $1.50/M input and $9.00/M output via google. Grok 4.3 costs $1.25/M input and $2.50/M output via xai.

What are the context window sizes for Gemini 3.5 Flash and Grok 4.3?

Gemini 3.5 Flash supports 1.0M tokens and Grok 4.3 supports 1.0M tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Gemini 3.5 Flash and Grok 4.3?

Key differences include context window (1.0M vs 1.0M), input pricing ($1.50 vs $1.25/M), multimodal support (yes vs no). See the full comparison above for benchmark-by-benchmark results.

Who makes Gemini 3.5 Flash and Grok 4.3?

Gemini 3.5 Flash is developed by Google and Grok 4.3 is developed by xAI.

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