Gemini 2.5 Pro Preview 06-05 vs Grok 4 Fast
Gemini 2.5 Pro Preview 06-05 and Grok 4 Fast are closely matched at 29.9 and 32.0 on the LLM Stats Score. Grok 4 Fast is 12.5x cheaper per token.
Google · xAI · Updated for 2026
Which is better?
Gemini 2.5 Pro Preview 06-05 and Grok 4 Fast are closely matched on the overall LLM Stats Score at 29.9 and 32.0.
In the 5 individual benchmarks reported for both models, Grok 4 Fast wins 3; this is a narrower head-to-head signal than the composite indexes.
On price, Grok 4 Fast is roughly 12.5x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Grok 4 Fast also accepts a larger context window (2,000,000 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 2.5 Pro Preview 06-05
- you want predictable pricing at $1.25/M input and $10.00/M output
Choose Grok 4 Fast
- you value its reported benchmark strengths — it wins 3 of 5 exact shared results
- cost matters — it's about 12.5x cheaper per token
- you process long inputs — it offers a 2,000,000 token context window
- you want the most recent training data — it shipped Aug 2025
At a glance
The differences that matter most.
Capability indexes
Additional strengths measured across groups of related public benchmarks
Individual benchmarks
13 reported for Gemini 2.5 Pro Preview 06-05 · 7 for Grok 4 Fast
Gemini 2.5 Pro Preview 06-05 outperforms in 2 benchmarks (GPQA, Humanity's Last Exam), while Grok 4 Fast is better at 3 benchmarks (AIME 2025, LiveCodeBench, SimpleQA).
Grok 4 Fast has a slight edge in benchmark performance.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, Gemini 2.5 Pro Preview 06-05 ($1.25/1M tokens) is 6.3x more expensive than Grok 4 Fast ($0.20/1M tokens).
For output processing, Gemini 2.5 Pro Preview 06-05 ($10.00/1M tokens) is 20.0x more expensive than Grok 4 Fast ($0.50/1M tokens).
In conclusion, Gemini 2.5 Pro Preview 06-05 is more expensive than Grok 4 Fast.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Grok 4 Fast accepts 2,000,000 input tokens compared to Gemini 2.5 Pro Preview 06-05's 1,048,576 tokens. Gemini 2.5 Pro Preview 06-05 can generate longer responses up to 65,535 tokens, while Grok 4 Fast is limited to 30,000 tokens.
Input capabilities
Documented input modalities across available providers
Both Gemini 2.5 Pro Preview 06-05 and Grok 4 Fast support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
Gemini 2.5 Pro Preview 06-05
Grok 4 Fast
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 2.5 Pro Preview 06-05 was released on 2025-06-05, while Grok 4 Fast was released on 2025-08-28.
Grok 4 Fast is 3 months newer than Gemini 2.5 Pro Preview 06-05.
Jun 5, 2025
1.3 years ago
Aug 28, 2025
1.0 years ago
2mo newerKnowledge Cutoff
When training data ends
Gemini 2.5 Pro Preview 06-05 has a documented knowledge cutoff of 2025-01-31, while Grok 4 Fast's cutoff date is not specified.
We can confirm Gemini 2.5 Pro Preview 06-05's training data extends to 2025-01-31, but cannot make a direct comparison without Grok 4 Fast's cutoff date.
Jan 2025
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Provider Availability
Gemini 2.5 Pro Preview 06-05 is available from Google. Grok 4 Fast is available from xAI.
Gemini 2.5 Pro Preview 06-05
Grok 4 Fast
Outputs Comparison
Judge for yourself.
Run your own prompts against Gemini 2.5 Pro Preview 06-05 and Grok 4 Fast side-by-side, then vote on the output you prefer.
FAQ
Common questions about Gemini 2.5 Pro Preview 06-05 vs Grok 4 Fast.