Comparison
Claude Sonnet 5 vs GPT-5.5
Per input token, Claude Sonnet 5 runs 60% cheaper than GPT-5.5. Claude Sonnet 5 is 67% cheaper on output tokens. GPT-5.5 has the larger context window than Claude Sonnet 5.
| Field | Claude Sonnet 5 | GPT-5.5 |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Context window | 1M | 1.1M |
| Max output | 128K | 128K |
| Input / 1M | $2.0060% cheaper | $5.00 |
| Output / 1M | $10.0067% cheaper | $30.00 |
| Cached input / 1M | $0.2060% cheaper | $0.50 |
| Batch discount | 50% | 50% |
| Release date | — | 2026-04-23 |
Worked cost examples
Estimated monthly cost on three common usage shapes
| Workload | Claude Sonnet 5 | GPT-5.5 |
|---|---|---|
Chatbot 800 input / 200 output tokens per request, 100,000 requests/month | $360.00cheaper | $1,000 |
RAG pipeline 6,000 input / 700 output tokens per request, 30,000 requests/month | $570.00cheaper | $1,530 |
Batch summarization 20,000 input / 1,500 output tokens per request, 5,000 requests/month | $275.00cheaper | $725.00 |
Claude Sonnet 5 vs GPT-5.5 FAQ
- Is Claude Sonnet 5 cheaper than GPT-5.5?
- Claude Sonnet 5 costs $2.00 per 1M input tokens versus $5.00 for GPT-5.5 — Claude Sonnet 5 is 60% cheaper per input token.
- Which is cheaper for output tokens, Claude Sonnet 5 or GPT-5.5?
- Claude Sonnet 5 charges $10.00 per 1M output tokens; GPT-5.5 charges $30.00 per 1M output tokens.
- Which has the larger context window, Claude Sonnet 5 or GPT-5.5?
- GPT-5.5 does, with a 1,050,000-token context window.
- Do Claude Sonnet 5 and GPT-5.5 offer cache pricing?
- Claude Sonnet 5 discounts cached input to $0.20 per 1M tokens. GPT-5.5 discounts cached input to $0.50 per 1M tokens.
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