Claude Sonnet 4 vs Claude Sonnet 4.5
Pricing verdict: Claude Sonnet 4 vs Claude Sonnet 4.5: pricing is a tie at $3.00/M input and $15.00/M output. There is no direct price edge, so choose based on capabilities and workflow fit.
Direct answer: pricing is a tie. Choose the model that best fits your capabilities, latency, and provider preferences.
Compare API pricing, input and output token costs, context windows, and monthly estimates on one page so you can pick the right model fast.
Cost Comparison (1000 input + 500 output tokens, 100 requests/day)
Claude Sonnet 4
Claude Sonnet 4.5
Cost Differences
Both models cost the same at the default workload.
Quick Recommendation
Direct API pricing is a tie at the default workload: both land around $31.50/month. Choose the model that better fits your workflow.
Feature Comparison
| Feature | Claude Sonnet 4 | Claude Sonnet 4.5 |
|---|---|---|
| Provider | Anthropic | Anthropic |
| Input Price | $3.00/1M tokens | $3.00/1M tokens |
| Output Price | $15.00/1M tokens | $15.00/1M tokens |
| Context Window | 200,000 tokens | 200,000 tokens |
| Max Output | 64,000 tokens | 64,000 tokens |
| Category | standard | balanced |
| Capabilities | textvisioncodereasoning | textvisioncode |
| Release Date | 5/14/2025 | 9/29/2025 |
Claude Sonnet 4 vs Claude Sonnet 4.5: Which Should You Choose?
Choosing between Claude Sonnet 4 and Claude Sonnet 4.5 depends on your priorities: cost efficiency, context length, or raw capability. Both models cost the same on input and output tokens, so raw price is a tie.
These models target different tiers: Claude Sonnet 4 is a standard model while Claude Sonnet 4.5 is balanced. This means they're optimized for different workloads. Claude Sonnet 4.5 targets more demanding workloads, while Claude Sonnet 4 provides a cost-effective option for everyday tasks.
Output costs matter too. Claude Sonnet 4 charges $15.00/1M output tokens vs $15.00 for Claude Sonnet 4.5.
Multimodal capabilities: Both models support vision (image understanding), so you can send images alongside text prompts with either option.
Best Use Cases
Choose Claude Sonnet 4 when:
- • You need more capabilities (reasoning)
- • You're already using Anthropic's API ecosystem
Choose Claude Sonnet 4.5 when:
- • You're already using Anthropic's API ecosystem
Pros and Caveats at a Glance
Claude Sonnet 4
- • Input pricing: $3.00/M tokens
- • Output pricing: $15.00/M tokens
- • Context window: 200,000 tokens
- • Max output: 64,000 tokens
Watch out for
- • Trade-offs are minor in this matchup.
Claude Sonnet 4.5
- • Input pricing: $3.00/M tokens
- • Output pricing: $15.00/M tokens
- • Context window: 200,000 tokens
- • Max output: 64,000 tokens
Watch out for
- • Trade-offs are minor in this matchup.
Try Different Scenarios
Use the calculator below to see how costs change with different usage patterns
Claude Sonnet 4 (Anthropic)
Claude Sonnet 4.5 (Anthropic)
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Sign Up for Anthropic →Frequently Asked Questions
Which is cheaper, Claude Sonnet 4 or Claude Sonnet 4.5?▼
What is the context window difference between Claude Sonnet 4 and Claude Sonnet 4.5?▼
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