Sonnet 5.5.
Sonnet 5.5 by Anthropic: P2 on the Nov 3, 2026 board with a score of 56, 2 behind Opus 5.5. List price $2 in and $10 out per million tokens. Test Lap: Traffic.
| Day | Pos | Score | $ in / out | OpenRouter | Vercel | Spend | Test lap |
|---|---|---|---|---|---|---|---|
| Nov 3, 2026 | P2 | 56 | $2 / $10 | 1.3% | 2.1% | 5.6% | Traffic |
| Nov 2, 2026 | P2 | 56 | $2 / $10 | 1.3% | 2.0% | 5.5% | Traffic |
| Nov 1, 2026 | P2 | 56 | $2 / $10 | 1.3% | – | 5.6% | Traffic |
| Oct 31, 2026 | P2 | 56 | $2 / $10 | 1.4% | – | 5.5% | Traffic |
| Oct 30, 2026 | P2 | 56 | $2 / $10 | 1.4% | 2.1% | 5.4% | Traffic |
| Oct 29, 2026 | P2 | 56 | $2 / $10 | 1.4% | – | 5.4% | Traffic |
| Oct 28, 2026 | P2 | 56 | $2 / $10 | 1.3% | – | 5.5% | Traffic |
| Oct 27, 2026 | P2 | 56 | $2 / $10 | 1.3% | – | 5.5% | Traffic |
| Oct 26, 2026 | P2 | 56 | $2 / $10 | 1.3% | 2.2% | 5.4% | Traffic |
| Oct 25, 2026 | P2 | 56 | $2 / $10 | 1.3% | – | 5.3% | Traffic |
| Oct 24, 2026 | P2 | 56 | $2 / $10 | 1.4% | – | 5.2% | Traffic |
| Oct 23, 2026 | P2 | 56 | $2 / $10 | 1.4% | 2.3% | 5.3% | Traffic |
| Oct 22, 2026 | P2 | 56 | $2 / $10 | 1.5% | – | 5.1% | Traffic |
| Oct 21, 2026 | P2 | 56 | $2 / $10 | 1.5% | – | 4.9% | Traffic |
| Oct 20, 2026 | P2 | 56 | $2 / $10 | 1.5% | – | 4.8% | – |
| Oct 19, 2026 | P2 | 56 | $2 / $10 | 1.5% | 2.6% | 4.7% | – |
| Oct 18, 2026 | P2 | 56 | $2 / $10 | 1.5% | 2.6% | 4.5% | – |
| Oct 17, 2026 | P2 | 56 | $2 / $10 | 1.6% | 2.6% | 4.5% | – |
| Oct 16, 2026 | P2 | 56 | $2 / $10 | 1.6% | 2.5% | 4.3% | – |
| Oct 15, 2026 | P2 | 56 | $2 / $10 | 1.6% | 2.4% | 4.2% | – |
| Oct 14, 2026 | P2 | 56 | $2 / $10 | 1.5% | 2.3% | 4.2% | – |
| Oct 13, 2026 | P2 | 56 | $2 / $10 | 1.5% | 2.1% | 4.2% | – |
| Oct 12, 2026 | P2 | 56 | $2 / $10 | 1.5% | 2.0% | 4.1% | – |
| Oct 11, 2026 | P2 | 56 | $2 / $10 | – | – | 3.9% | – |
- Context window
- 1M tokens
- Max output
- 128K tokens
- Released
- Sep 28, 2026
- Inputs
- text, image, pdf
- Outputs
- text
- Cached input
- $0.10 per 1M tokens
- Weights
- closed
How much does Sonnet 5.5 cost?
$2 per million input tokens and $10 per million output tokens at list price, $4 blended at three input tokens to one output. Cached input is $0.10 per million.
How does Sonnet 5.5 score?
56 on the Artificial Analysis Intelligence Index: P2 of 14 on the Nov 3, 2026 board, 2 behind Opus 5.5.
What is the context window of Sonnet 5.5?
1M tokens, with up to 128K tokens of output.
How widely is Sonnet 5.5 used?
Over the trailing seven days: 1.3% of tokens on OpenRouter; 2.1% of tokens on Vercel AI Gateway; 5.6% of spend on Vercel AI Gateway.
Is Sonnet 5.5 good for real work?
Its Test Lap verdict is Traffic: fine, nothing special.
Score is the Artificial Analysis Intelligence Index. Price is list, per million tokens. Usage is the share of tokens over the trailing seven days on OpenRouter and on the Vercel AI Gateway usage data, both licensed under CC BY 4.0; a dash means too small to call. Specs come from Vercel AI Gateway's model list and the lab's own documentation. Timing by sleds, which routes work across every lab and favours none.