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Side-by-side comparison of Claude Sonnet 4.5 and GPT-5.3. Claude Sonnet 4.5 scores 67 on quality benchmarks at $18.00/1M tokens. GPT-5.3 scores 70 at $12.00/1M tokens.
Claude Sonnet 4.5 is the more affordable option. GPT-5.3 leads in quality benchmarks at a lower price point. For budget-conscious users, go with GPT-5.3. For maximum quality, choose GPT-5.3.
| Claude Sonnet 4.5 | GPT-5.3 | |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Tier | Premium | Frontier |
| Quality Score | 67 | 70 |
| Input Price | $3.00/1M | $2.00/1M |
| Output Price | $15.00/1M | $10.00/1M |
| Speed | 70 tok/s | 80 tok/s |
| Context Window | 1.0M | 400K |
| Max Output | 64K | 64K |
| Reasoning | Yes | Yes |
| Vision | Yes | Yes |
| Task | Claude Sonnet 4.5 | GPT-5.3 | Savings |
|---|---|---|---|
| Coding | $35.10 | $23.40 | GPT-5.3 saves $11.70 |
| Writing | $9.36 | $6.24 | GPT-5.3 saves $3.12 |
| Analysis | $19.50 | $13.00 | GPT-5.3 saves $6.50 |
| Math & Reasoning | $11.70 | $7.80 | GPT-5.3 saves $3.90 |
| Creative | $7.80 | $5.20 | GPT-5.3 saves $2.60 |
| General Chat | $2.34 | $1.56 | GPT-5.3 saves $0.78 |