Anthropic: Claude Sonnet 5 vs OpenAI: GPT-5.5
On input price, Anthropic: Claude Sonnet 5 is ~2.5× cheaper. Verified 2026-08-23.
| Metric | Anthropic: Claude Sonnet 5 | OpenAI: GPT-5.5 |
|---|---|---|
| Input / 1M | $2.00 | $5.00 |
| Output / 1M | $10.00 | $30.00 |
| Cache read / 1M | $0.200 | $0.500 |
| Context window | 1M | 1.1M |
| Max output | 128K | 128K |
Monthly cost by workload
| Workload | Anthropic: Claude Sonnet 5 | OpenAI: GPT-5.5 | Cheaper |
|---|---|---|---|
| Chatbot | $56.00 | $160.00 | Anthropic: Claude Sonnet 5 |
| Coding agent | $180.00 | $500.00 | Anthropic: Claude Sonnet 5 |
| RAG pipeline | $390.00 | $1050.00 | Anthropic: Claude Sonnet 5 |
Full details: Anthropic: Claude Sonnet 5 pricing · OpenAI: GPT-5.5 pricing