Claude Sonnet 4.5 vs Gemini 3 Pro
Complete pricing and performance comparison between Anthropic's Claude Sonnet 4.5 and Google's Gemini 3 Pro.
Quick Verdict
Cheaper
Gemini 3 Pro
1.5x cheaper input, 1.3x cheaper output
Larger Context
Gemini 3 Pro
1.0M vs 200K
Pricing Comparison
| Spec | Claude Sonnet 4.5 | Gemini 3 Pro | Difference |
|---|---|---|---|
| Provider | Anthropic | ||
| Input / 1M tokens | $3 | $2 | Gemini 3 Pro is 33% more expensive |
| Output / 1M tokens | $15 | $12 | Gemini 3 Pro is 20% more expensive |
| Context Window | 200K | 1.0M | 5x difference |
| Max Output | 64K | 66K |
Performance Benchmarks
| Metric | Claude Sonnet 4.5 | Gemini 3 Pro | Winner |
|---|---|---|---|
| Quality Index | -- | 48 | N/A |
| Output Speed | -- | 120 tok/s | N/A |
| Value (Quality/$) | -- | 24.2 | 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 | Claude Sonnet 4.5 | Gemini 3 Pro | Savings |
|---|---|---|---|
Single request 1K in / 300 out | $0.0075 | $0.0056 | Gemini 3 Pro saves $0.0019 |
10 requests 10K in / 3K out | $0.075 | $0.056 | Gemini 3 Pro saves $0.019 |
100 requests 100K in / 30K out | $0.750 | $0.560 | Gemini 3 Pro saves $0.190 |
1,000 requests 1M in / 300K out | $7.50 | $5.60 | Gemini 3 Pro saves $1.90 |
10,000 requests 10M in / 3M out | $75.00 | $56.00 | Gemini 3 Pro saves $19.00 |
1M requests/mo 1B in / 300M out | $7500.00 | $5600.00 | Gemini 3 Pro saves $1900.00 |
Pros & Cons
Claude Sonnet 4.5 Strengths
Part of the Anthropic ecosystem
Gemini 3 Pro Strengths
- +Cheaper input tokens
- +Cheaper output tokens
- +Larger context window (1.0M vs 200K)
- +Higher max output tokens
When to Use Each Model
Choose Claude Sonnet 4.5 for
- →Projects already integrated with Anthropic's ecosystem
Choose Gemini 3 Pro for
- →Budget-conscious projects where cost is the primary factor
- →Long documents, large codebases, or multi-turn conversations
- →Generating long-form content or detailed code
Frequently Asked Questions
Which is cheaper, Claude Sonnet 4.5 or Gemini 3 Pro?
For input tokens, Gemini 3 Pro is 1.5x cheaper at $2/1M tokens. For output tokens, Gemini 3 Pro is 1.3x cheaper at $12/1M tokens. At typical usage (1M input + 300K output), Claude Sonnet 4.5 costs $7.50 vs Gemini 3 Pro at $5.60.
What's the context window difference?
Claude Sonnet 4.5 supports 200K context (200,000 tokens), while Gemini 3 Pro supports 1.0M (1,048,576 tokens). Gemini 3 Pro can handle 5x more context in a single request.
Which model has better benchmarks?
When should I choose Claude Sonnet 4.5 over Gemini 3 Pro?
Choose Claude Sonnet 4.5 when you need: a Anthropic ecosystem model. Choose Gemini 3 Pro when you need: Cheaper input tokens, Cheaper output tokens, Larger context window (1.0M vs 200K), Higher max output tokens.
How much would 10,000 API requests cost?
At 1K input + 300 output tokens per request (typical chat): Claude Sonnet 4.5 = $75.00, Gemini 3 Pro = $56.00. At 10K input + 1K output per request (longer conversations): Claude Sonnet 4.5 = $450.00, Gemini 3 Pro = $320.00.