Claude Sonnet 4.6 vs Gemini 2.5 Flash
Complete pricing and performance comparison between Anthropic's Claude Sonnet 4.6 and Google's Gemini 2.5 Flash.
Quick Verdict
Cheaper
Gemini 2.5 Flash
10.0x cheaper input, 6.0x cheaper output
Larger Context
Gemini 2.5 Flash
1.0M vs 200K
Higher Quality
Claude Sonnet 4.6
Score: 44 vs 21
Faster
Gemini 2.5 Flash
231 vs 59 tok/s
Pricing Comparison
| Spec | Claude Sonnet 4.6 | Gemini 2.5 Flash | Difference |
|---|---|---|---|
| Provider | Anthropic | ||
| Input / 1M tokens | $3 | $0.3 | Gemini 2.5 Flash is 90% more expensive |
| Output / 1M tokens | $15 | $2.5 | Gemini 2.5 Flash is 83% more expensive |
| Context Window | 200K | 1.0M | 5x difference |
| Max Output | 64K | 66K |
Performance Benchmarks
| Metric | Claude Sonnet 4.6 | Gemini 2.5 Flash | Winner |
|---|---|---|---|
| Quality Index | 44 | 21 | Claude Sonnet 4.6 |
| Output Speed | 59 tok/s | 231 tok/s | Gemini 2.5 Flash |
| Time to First Token | 1.30s | 0.42s | Gemini 2.5 Flash |
| Value (Quality/$) | 14.8 | 68.7 | 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 4.6 | Gemini 2.5 Flash | Savings |
|---|---|---|---|
Single request 1K in / 300 out | $0.0075 | $0.0010 | Gemini 2.5 Flash saves $0.0065 |
10 requests 10K in / 3K out | $0.075 | $0.010 | Gemini 2.5 Flash saves $0.065 |
100 requests 100K in / 30K out | $0.750 | $0.105 | Gemini 2.5 Flash saves $0.645 |
1,000 requests 1M in / 300K out | $7.50 | $1.05 | Gemini 2.5 Flash saves $6.45 |
10,000 requests 10M in / 3M out | $75.00 | $10.50 | Gemini 2.5 Flash saves $64.50 |
1M requests/mo 1B in / 300M out | $7500.00 | $1050.00 | Gemini 2.5 Flash saves $6450.00 |
Pros & Cons
Claude Sonnet 4.6 Strengths
- +Higher quality score (44 vs 21)
Gemini 2.5 Flash Strengths
- +Cheaper input tokens
- +Cheaper output tokens
- +Larger context window (1.0M vs 200K)
- +Higher max output tokens
- +Faster output (231 vs 59 tok/s)
- +Lower latency (faster first token)
When to Use Each Model
Choose Claude Sonnet 4.6 for
- →Tasks requiring maximum accuracy and reasoning
Choose Gemini 2.5 Flash 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
- →Real-time applications, chat, or autocomplete
Frequently Asked Questions
Which is cheaper, Claude Sonnet 4.6 or Gemini 2.5 Flash?
For input tokens, Gemini 2.5 Flash is 10.0x cheaper at $0.3/1M tokens. For output tokens, Gemini 2.5 Flash is 6.0x cheaper at $2.5/1M tokens. At typical usage (1M input + 300K output), Claude Sonnet 4.6 costs $7.50 vs Gemini 2.5 Flash at $1.05.
What's the context window difference?
Claude Sonnet 4.6 supports 200K context (200,000 tokens), while Gemini 2.5 Flash supports 1.0M (1,048,576 tokens). Gemini 2.5 Flash can handle 5x more context in a single request.
Which model has better benchmarks?
Quality Index: Claude Sonnet 4.6 scores 44 vs Gemini 2.5 Flash at 21. Speed: Claude Sonnet 4.6 generates 59 tok/s vs Gemini 2.5 Flash at 231 tok/s. Time to first token: Claude Sonnet 4.6 at 1.30s vs Gemini 2.5 Flash at 0.42s.
When should I choose Claude Sonnet 4.6 over Gemini 2.5 Flash?
Choose Claude Sonnet 4.6 when you need: Higher quality score (44 vs 21). Choose Gemini 2.5 Flash when you need: Cheaper input tokens, Cheaper output tokens, Larger context window (1.0M vs 200K), Higher max output tokens, Faster output (231 vs 59 tok/s), Lower latency (faster first token).
How much would 10,000 API requests cost?
At 1K input + 300 output tokens per request (typical chat): Claude Sonnet 4.6 = $75.00, Gemini 2.5 Flash = $10.50. At 10K input + 1K output per request (longer conversations): Claude Sonnet 4.6 = $450.00, Gemini 2.5 Flash = $55.00.
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