Gemini 1.5 Flash vs Grok-2
Grok-2 leads the LLM Stats Score 11.5 to 6.1. Gemini 1.5 Flash is 15.2x cheaper per token.
Google · xAI · Updated for 2026
Which is better?
Grok-2 leads the overall LLM Stats Score 11.5 to 6.1, ranking #247 overall.
In the 7 individual benchmarks reported for both models, Grok-2 wins 6; this is a narrower head-to-head signal than the composite indexes.
On price, Gemini 1.5 Flash is roughly 15.2x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Gemini 1.5 Flash also accepts a larger context window (1,048,576 input tokens), making it the stronger choice for long documents and large codebases.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose Gemini 1.5 Flash
- cost matters — it's about 15.2x cheaper per token
- you process long inputs — it offers a 1,048,576 token context window
Choose Grok-2
- overall performance matters — it scores 11.5 and ranks #247 on LLM Stats
- your work emphasizes reasoning — it leads those capability indexes
- you value its reported benchmark strengths — it wins 6 of 7 exact shared results
- you want the most recent training data — it shipped Aug 2024
At a glance
The differences that matter most.
Capability indexes
Additional strengths measured across groups of related public benchmarks
Individual benchmarks
22 reported for Gemini 1.5 Flash · 8 for Grok-2
Gemini 1.5 Flash outperforms in 1 benchmarks (MATH), while Grok-2 is better at 6 benchmarks (GPQA, HumanEval, MathVista, MMLU, MMLU-Pro, MMMU).
Grok-2 significantly outperforms across most benchmarks.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, Gemini 1.5 Flash ($0.15/1M tokens) is 13.3x cheaper than Grok-2 ($2.00/1M tokens).
For output processing, Gemini 1.5 Flash ($0.60/1M tokens) is 16.7x cheaper than Grok-2 ($10.00/1M tokens).
In conclusion, Grok-2 is more expensive than Gemini 1.5 Flash.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Gemini 1.5 Flash accepts 1,048,576 input tokens compared to Grok-2's 128,000 tokens. Gemini 1.5 Flash can generate longer responses up to 8,192 tokens, while Grok-2 is limited to 8,000 tokens.
Input capabilities
Documented input modalities across available providers
Both Gemini 1.5 Flash and Grok-2 support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
Gemini 1.5 Flash
Grok-2
License
Usage and distribution terms
Both models are licensed under proprietary licenses.
Both models have usage restrictions defined by their respective organizations.
Proprietary
Closed source
Proprietary
Closed source
Release Timeline
When each model was launched
Gemini 1.5 Flash was released on 2024-05-01, while Grok-2 was released on 2024-08-13.
Grok-2 is 3 months newer than Gemini 1.5 Flash.
May 1, 2024
2.4 years ago
Aug 13, 2024
2.1 years ago
3mo newerKnowledge Cutoff
When training data ends
Gemini 1.5 Flash has a documented knowledge cutoff of 2023-11-01, while Grok-2's cutoff date is not specified.
We can confirm Gemini 1.5 Flash's training data extends to 2023-11-01, but cannot make a direct comparison without Grok-2's cutoff date.
Nov 2023
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Provider Availability
Gemini 1.5 Flash is available from Google. Grok-2 is available from xAI.
Gemini 1.5 Flash
Grok-2
Outputs Comparison
Judge for yourself.
Run your own prompts against Gemini 1.5 Flash and Grok-2 side-by-side, then vote on the output you prefer.
FAQ
Common questions about Gemini 1.5 Flash vs Grok-2.