Effort levels by model › Claude Sonnet 5.5
Claude Sonnet 5.5 reasoning effort levels: intelligence, cost and speed
How much smarter Claude Sonnet 5.5 gets at each reasoning effort, what each level costs per task, and how fast it answers. Benchmarks from Artificial Analysis.
| Effort | Intelligence Index | Gain vs. previous | Cost per task | Output tokens/s |
|---|---|---|---|---|
| low Best intelligence per dollar | 25 | — | $0.51 | 107 |
| medium | 30 | +5 | $0.78 | 106 |
| high | 41 | +11 | $1.64 | 108 |
| xhigh | 50 | +9 | $4.09 | 109 |
| max | 54 | +4 | $10.02 | 138 |
API: $2 / $10 per 1M input / output tokens.
Source: Artificial Analysis LLM Leaderboard, checked 2026-11-02.