Anthropic
Anthropic's most agentic Sonnet model, bringing frontier-level coding and tool use at Sonnet's speed and price
51.7
Quality Score
1273
Arena ELO
Undisclosed
Parameters
1M
Context
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 official provider benchmark evidence, but not a normalized independent benchmark table yet.
A full normalized benchmark row is not available for this model yet.
Official benchmark evidence is already available below, so this release is still being tracked while the normalized table catches up.
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28.1K
Downloads
0
Likes
Aug 2026
Released
These are recent benchmark or leaderboard claims from official provider sources. They are useful for freshness and context, but they are not treated the same as normalized independent benchmark rows.
Introducing Claude Sonnet 5
Introducing Claude Sonnet 5 \ Anthropic Skip to main content Skip to footer Research Policy Commitments Learn News Try Claude Product Introducing Claude Sonnet 5 Jun 30, 2026 Claude Sonnet 5 is built to be the most agentic Sonnet model yet. For many developers, the agentic AI era began with Sonnet-class models: Claude Sonnet 3.5, 3.6, and 3.7 were the first models that showed impressive skills in coding and tool use. More recently, though, the clearest gains in agentic capabi
View source1273
ELO Score
1264 - 1282
95% Confidence
+/-9 points
6.1K
Battles
Aug 19, 2026
Last Updated