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