Claude Sonnet 5.5
#6 of 31 text models on overall (provisional). $7.00 per 1,000 support replies at list price.
Price checked 25 Oct 2026 via vendor- Released
- 28 Sept 2026
- Context window
- 1M tokens
- Longest reply
- 128K tokens
- Open weights
- No
- Reasoning mode
- Yes
- Tool use
- Yes
- Reads
- text, image, pdf
- Writes
- text
- Knowledge cutoff
- 2026-06
Overall79
Writing74
Support69
Coding87
Value69
Provisional, 0 to 100 among the text models we track, from Arena and Epoch AI. How we score.Prices and where to run it
| Provider | Region | Input per 1M | Output per 1M | Cached input | Data retention | Checked |
|---|---|---|---|---|---|---|
| anthropic | global | $2.00 | $10.00 | $0.10 | Not checked | 25 Oct 2026, vendor |
| openrouter | global | $2.00 | $10.00 | $0.10 | Not checked | 25 Oct 2026, OpenRouter |
Price history and a CSV download arrive with the open price dataset.
Benchmarks behind the scores
| Measure | Figure | Run date | Source |
|---|---|---|---|
| Epoch Capabilities Index | 166.2 | 25 Oct 2026 | Epoch AI |
| Arena text, coding | 1510.5 | 22 Oct 2026 | Arena |
| Arena text, creative writing | 1468.3 | 22 Oct 2026 | Arena |
| Arena text, instruction following | 1490.5 | 22 Oct 2026 | Arena |
| Arena text, multi-turn | 1465.3 | 22 Oct 2026 | Arena |
| Arena text, overall | 1473.1 | 22 Oct 2026 | Arena |
| Arena WebDev | 1768.9 | 23 Oct 2026 | Arena |
Call it through OpenRouter
curl https://openrouter.ai/api/v1/chat/completions \
-H "Authorization: Bearer $OPENROUTER_API_KEY" \
-H "Content-Type: application/json" \
-d '{"model": "anthropic/claude-sonnet-5.5", "messages": [{"role": "user", "content": "Hello"}]}'