Gemini 2.5 Pro vs Grok 4
Complete pricing and performance comparison between Google's Gemini 2.5 Pro and xAI's Grok 4.
Quick Verdict
Cheaper
Gemini 2.5 Pro
2.4x cheaper input, 1.5x cheaper output
Larger Context
Grok 4
2.0M vs 1.0M
Higher Quality
Grok 4
Score: 42 vs 35
Faster
Gemini 2.5 Pro
128 vs 49 tok/s
Pricing Comparison
| Spec | Gemini 2.5 Pro | Grok 4 | Difference |
|---|---|---|---|
| Provider | xAI | ||
| Input / 1M tokens | $1.25 | $3 | Gemini 2.5 Pro is 58% more expensive |
| Output / 1M tokens | $10 | $15 | Gemini 2.5 Pro is 33% more expensive |
| Context Window | 1.0M | 2.0M | 2x difference |
| Max Output | 66K | 16K |
Performance Benchmarks
| Metric | Gemini 2.5 Pro | Grok 4 | Winner |
|---|---|---|---|
| Quality Index | 35 | 42 | Grok 4 |
| Output Speed | 128 tok/s | 49 tok/s | Gemini 2.5 Pro |
| Time to First Token | 22.13s | 9.39s | Grok 4 |
| Value (Quality/$) | 27.7 | 13.8 | Higher = better value |
Benchmark data from Artificial Analysis. Quality Index is a composite score across reasoning, coding, and knowledge tasks.
Cost at Scale
Estimated cost at different usage levels (3:1 input-to-output token ratio, typical for chat).
| Usage | Gemini 2.5 Pro | Grok 4 | Savings |
|---|---|---|---|
Single request 1K in / 300 out | $0.0042 | $0.0075 | Gemini 2.5 Pro saves $0.0033 |
10 requests 10K in / 3K out | $0.042 | $0.075 | Gemini 2.5 Pro saves $0.033 |
100 requests 100K in / 30K out | $0.425 | $0.750 | Gemini 2.5 Pro saves $0.325 |
1,000 requests 1M in / 300K out | $4.25 | $7.50 | Gemini 2.5 Pro saves $3.25 |
10,000 requests 10M in / 3M out | $42.50 | $75.00 | Gemini 2.5 Pro saves $32.50 |
1M requests/mo 1B in / 300M out | $4250.00 | $7500.00 | Gemini 2.5 Pro saves $3250.00 |
Pros & Cons
Gemini 2.5 Pro Strengths
- +Cheaper input tokens
- +Cheaper output tokens
- +Higher max output tokens
- +Faster output (128 vs 49 tok/s)
Grok 4 Strengths
- +Larger context window (2.0M vs 1.0M)
- +Higher quality score (42 vs 35)
- +Lower latency (faster first token)
When to Use Each Model
Choose Gemini 2.5 Pro for
- →Budget-conscious projects where cost is the primary factor
- →Generating long-form content or detailed code
- →Real-time applications, chat, or autocomplete
Choose Grok 4 for
- →Long documents, large codebases, or multi-turn conversations
- →Tasks requiring maximum accuracy and reasoning
Frequently Asked Questions
Which is cheaper, Gemini 2.5 Pro or Grok 4?
For input tokens, Gemini 2.5 Pro is 2.4x cheaper at $1.25/1M tokens. For output tokens, Gemini 2.5 Pro is 1.5x cheaper at $10/1M tokens. At typical usage (1M input + 300K output), Gemini 2.5 Pro costs $4.25 vs Grok 4 at $7.50.
What's the context window difference?
Gemini 2.5 Pro supports 1.0M context (1,048,576 tokens), while Grok 4 supports 2.0M (2,000,000 tokens). Grok 4 can handle 2x more context in a single request.
Which model has better benchmarks?
Quality Index: Gemini 2.5 Pro scores 35 vs Grok 4 at 42. Speed: Gemini 2.5 Pro generates 128 tok/s vs Grok 4 at 49 tok/s. Time to first token: Gemini 2.5 Pro at 22.13s vs Grok 4 at 9.39s.
When should I choose Gemini 2.5 Pro over Grok 4?
Choose Gemini 2.5 Pro when you need: Cheaper input tokens, Cheaper output tokens, Higher max output tokens, Faster output (128 vs 49 tok/s). Choose Grok 4 when you need: Larger context window (2.0M vs 1.0M), Higher quality score (42 vs 35), Lower latency (faster first token).
How much would 10,000 API requests cost?
At 1K input + 300 output tokens per request (typical chat): Gemini 2.5 Pro = $42.50, Grok 4 = $75.00. At 10K input + 1K output per request (longer conversations): Gemini 2.5 Pro = $225.00, Grok 4 = $450.00.