Claude Opus 5.5
#1 of 31 text models on overall (provisional). $14.00 per 1,000 support replies at list price.
Price checked 25 Oct 2026 via vendor- Released
- 22 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
Overall97
Writing100
Support90
Coding100
Value83
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 | $4.00 | $20.00 | $0.20 | Not checked | 25 Oct 2026, vendor |
| openrouter | global | $4.00 | $20.00 | $0.20 | 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 | 168.8 | 25 Oct 2026 | Epoch AI |
| Arena text, coding | 1545 | 22 Oct 2026 | Arena |
| Arena text, creative writing | 1534.2 | 22 Oct 2026 | Arena |
| Arena text, instruction following | 1538.8 | 22 Oct 2026 | Arena |
| Arena text, multi-turn | 1504 | 22 Oct 2026 | Arena |
| Arena text, overall | 1516.2 | 22 Oct 2026 | Arena |
| Arena WebDev | 1806.9 | 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-opus-5.5", "messages": [{"role": "user", "content": "Hello"}]}'