Anthropic · closed weights · frontier
Anthropic: Claude Opus 4.5
Closed weights. There is no public download, so a local speed only exists if you type one in. The published id does not state a parameter count, so none is stored. Size class is this site's filter bucket, not a benchmark.
API price, in pounds
- Input, per million
- £3.73
- Output, per million
- £18.63
OpenRouter lists $5.0000 in and $25.0000 out per million tokens. Converted at 0.74501 on 2026-11-10. Fetched 2026-11-11. Context length listed as 200,000 tokens.
Sourced local speeds
No sourced tokens-per-second figure for this model. A speed is not invented. You can type one in the calculator if you have measured it.