Anthropic
Anthropic's latest Sonnet model, balancing frontier agentic coding, tool use, computer use, reasoning, and knowledge work with lower cost than the Opus tier.
Anthropic's latest Sonnet model, balancing frontier agentic coding, tool use, computer use, reasoning, and knowledge work with lower cost than the Opus tier.
61.2
Quality Score
1267
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.
19 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 normalized benchmark rows, so scores here are directly comparable across benchmark sources.
Sign in to join the discussion
78.3K
Downloads
0
Likes
Jun 2026
Released
4/5 signals
4/4 signals
5/5 signals
3/4 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
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.
Claude Sonnet 5 System Card
Anthropic reports Claude Sonnet 5 results for coding, terminal, research, and computer-use evaluations in its official system card.
View source1267
ELO Score
1259 - 1275
95% Confidence
+/-8 points
8.5K
Battles
Sep 5, 2026
Last Updated