Claude Sonnet 5 vs GPT-5.5
Price, context and benchmark scores side by side — every number from the live model catalogue.
| Claude Sonnet 5anthropic | GPT-5.5openai | |
|---|---|---|
| Input / 1M tokens | $2.00 | $5.00 |
| Output / 1M tokens | $10.00 | $30.00 |
| 1M in + 300K out | $5.00 | $14.00 |
| Context window | 1M | 1.1M |
| Intelligence index | 53.4 | 54.8 |
| Coding index | 71.5 | 74.9 |
| Agentic index | 46.7 | 44.9 |
| Cheapest provider | Azure | Azure |
| Providers serving it | 4 | 2 |
| Weights | Closed | Closed |
| Image input | Yes | Yes |
| Tool calling | Yes | Yes |
| Reasoning mode | Yes | Yes |
| Released | Jun 30, 2026 | Apr 24, 2026 |
Which one to pick
Pick Claude Sonnet 5 if…
- You are running agent loops — higher agentic index (46.7).
- Token cost matters: $10.00 per 1M output vs $30.00.
- You want provider redundancy: 4 providers serve it.
Pick GPT-5.5 if…
- You want the higher general-intelligence score (54.8).
- Code quality is the priority — it leads on the coding index (74.9).
- You need the bigger context window (1.1M).
FAQ
Is Claude Sonnet 5 better than GPT-5.5?
GPT-5.5 scores higher on general intelligence (53.4 vs 54.8), while Claude Sonnet 5 is 3.0× cheaper per output token ($10.00 vs $30.00). For code, GPT-5.5 leads (74.9 coding index). GPT-5.5 takes the larger context at 1.1M.
Which is cheaper, Claude Sonnet 5 or GPT-5.5?
Claude Sonnet 5, at $10.00 per 1M output tokens versus $30.00. On a 1M input + 300K output workload that is $5.00 against $14.00.
Can I self-host Claude Sonnet 5 or GPT-5.5?
Claude Sonnet 5: closed weights, API only. GPT-5.5: closed weights, API only.