Key Takeaways
Claude Sonnet 4 wins:
- Better at math
Claude Sonnet 4.5 wins:
- Faster response time
- Higher intelligence benchmark
- Better at coding
Price Advantage
Claude Sonnet 4
Benchmark Advantage
Claude Sonnet 4.5
Context Window
Claude Sonnet 4.5
Speed
Claude Sonnet 4.5
Pricing Comparison
Price Comparison
| Metric | Claude Sonnet 4 | Claude Sonnet 4.5 | Winner |
|---|---|---|---|
| Input (per 1M tokens) | $3.00 | $3.00 | Tie |
| Output (per 1M tokens) | $15.00 | $15.00 | Tie |
| Cache Read (per 1M) | $0.30 | $0.30 | Tie |
| Cache Write (per 1M) | $3.75 | $3.75 | Tie |
Both models have similar overall pricing.
Claude Sonnet 4 Providers
Amazon Bedrock $3.00 (Cheapest)
Google $3.00 (Cheapest)
Anthropic $3.00 (Cheapest)
Claude Sonnet 4.5 Providers
Amazon Bedrock $3.00 (Cheapest)
Google $3.00 (Cheapest)
Anthropic $3.00 (Cheapest)
Benchmark Comparison
8
Benchmarks Compared
1
Claude Sonnet 4 Wins
5
Claude Sonnet 4.5 Wins
Benchmark Scores
| Benchmark | Claude Sonnet 4 | Claude Sonnet 4.5 | Winner |
|---|---|---|---|
Intelligence Index Overall intelligence score | 33.0 | 37.1 | |
Coding Index Code generation & understanding | 30.6 | 33.5 | |
Math Index Mathematical reasoning | 38.0 | 37.0 | |
MMLU Pro Academic knowledge | 83.7 | 86.0 | |
GPQA Graduate-level science | 68.3 | 72.7 | |
LiveCodeBench Competitive programming | 44.9 | 59.0 | |
Aider Real-world code editing | 61.3 | - | - |
AIME Competition math | 40.7 | - | - |
Claude Sonnet 4.5 wins 5 out of 8 benchmarks.
Cost vs Quality
X-axis:
Y-axis:
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Claude Sonnet 4
Other models
Context & Performance
Context Window
Claude Sonnet 4
1,000,000
tokens
Max output: 64,000 tokens
Claude Sonnet 4.5
1,000,000
tokens
Max output: 64,000 tokens
Speed Performance
| Metric | Claude Sonnet 4 | Claude Sonnet 4.5 | Winner |
|---|---|---|---|
| Tokens/second | 69.8 tok/s | 70.4 tok/s | - |
| Time to First Token | 1.17s | 1.07s |
Capabilities
Feature Comparison
| Feature | Claude Sonnet 4 | Claude Sonnet 4.5 |
|---|---|---|
| Vision (Image Input) | ||
| Tool/Function Calls | ||
| Reasoning Mode | ||
| Audio Input | ||
| Audio Output | ||
| PDF Input | ||
| Prompt Caching | ||
| Web Search |
License & Release
| Property | Claude Sonnet 4 | Claude Sonnet 4.5 |
|---|---|---|
| License | Proprietary | Proprietary |
| Author | Anthropic | Anthropic |
| Released | May 2025 | Sep 2025 |
Claude Sonnet 4 Modalities
Input
imagetextfile
Output
text
Claude Sonnet 4.5 Modalities
Input
textimagefile
Output
text