Sonnet 5.5
Latest Nerf Watch result
On 2026-10-28, Sonnet 5.5 scored 99.12 on Nerf Watch's suite 2026.10.1, 1.84 points above its 7-day baseline.
- Latest run
- 99.12 on · suite 2026.10.1
- Previous run
- 95.02 on · suite 2026.10.1
- Change from previous run
- +4.10
- 7-day baseline
- 97.28 · 7 baseline runs
- Change from baseline
- +1.84
- Trend
- Steady
A score below the model's own baseline, the mean of its recent runs. One day's dip can be noise, and a lower score is a lower score on this suite, not proof that a provider changed a model.
Score history
As a table
| Day, UTC | Score | Suite |
|---|---|---|
| 99.12 | 2026.10.1 | |
| 95.02 | 2026.10.1 | |
| 99.80 | 2026.10.1 | |
| 93.88 | 2026.10.1 | |
| 96.82 | 2026.10.1 | |
| 95.92 | 2026.10.1 | |
| 100.00 | 2026.10.1 | |
| 99.53 | 2026.10.1 | |
| 96.86 | 2026.10.1 |
Speed
Response time
On , Sonnet 5.5's daily response-time probe recorded a median completion time of 2.2 s across three successful responses at high reasoning effort and Standard/default service.
The daily local probe is scheduled at 00:10 UTC. It uses high reasoning effort and three successful fresh single-turn responses to one fixed small task. A day without three successful responses has no point. Lower is faster; dates are UTC.
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Output speed
On , Sonnet 5.5's Nerf Watch run recorded 130 output tokens per second.
Tokens per second from the daily Nerf Watch run, scheduled at 01:00 UTC: total output tokens divided by total completion time across its four fixed tasks. Effort is low, except DeepSeek V4 Pro uses high, its lowest available variant. Service is Standard/default, or Ultrafast for the two Ultrafast lines. Output includes reported reasoning or thinking tokens once; OpenCode’s separately reported reasoning is added to output. Timing includes waiting within the measured turn and excludes setup and process exit. Higher is faster; dates are UTC.
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Facts from the research notes
API price
Latest API price record in Research note 002, as of 2026-10-12: $2.00 input and $10.00 output per million tokens. Record dated 2026-09-28.
platform.claude.com · Research note 002
Context window
No exact-model record in these research notes.
Parameters
No exact-model record in these research notes.