Anthropic
Claude Sonnet 5.5 is Anthropic's Sonnet-class model for well-scoped everyday work, succeeding Claude Sonnet 5 as a direct upgrade. It is especially strong at building features, fixing bugs, and producing...
OpenRouter
Price record: 2026-10-03. Source: openrouter.
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43.8
Quality Score
1268
Arena ELO
Undisclosed
Parameters
1M
Context
This measures the amount of verifiable public evidence we have, not how capable the model is. A missing field means it has not been verified yet, not that its value is zero.
13 of 22 public signals
Use this section to answer one simple question first: how much outside evidence do we have that this model performs well? Structured benchmark scores appear first, then official provider evidence, then live arena signal.
This model has live arena signal, but it does not have structured benchmark rows or provider benchmark evidence yet.
A full normalized benchmark row is not available for this model yet.
Live arena evidence is already available below, so there is still a competitive signal even without a full benchmark table yet.
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0
Downloads
0
Likes
Sep 2026
Released
3/5 signals
2/4 signals
4/5 signals
1/4 signals
3/4 signals
Parameters
—
Training compute
Not reported
Dataset scale
Not reported
Base model
Not reported
Source-reported access: API access · Confident confidence
Gaps we are still tracking
1268
ELO Score
1253 - 1283
95% Confidence
+/-15 points
1.6K
Battles
Oct 3, 2026
Last Updated