Models / Claude Sonnet 5.5
Claude Sonnet 5.5
Anthropic · Closed weights · Released Sep 28, 2026 · Price not listed
n/aOverall · not enough data
Score by job
~ is an early read: this model has results on too few benchmarks in that job to be ranked yet.
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Overall
Coding
Agents
Reasoning
Math
Writing
Design
Coding
Early read ~90 · not ranked · 2 of 5 benchmarks
| Benchmark | Result | Variant | z |
|---|---|---|---|
| FrontierCode | 52.1% | claude-sonnet-5-5_xhigh | 1.10 |
| LMArena Coding | 1513 rating | claude-sonnet-5.5-xhigh | 0.94 |
Agents
Early read ~100 · not ranked · 1 of 4 benchmarks
| Benchmark | Result | Variant | z |
|---|---|---|---|
| APEX-Agents | 75.5% | claude-sonnet-5-5_max | 2.01 |
Reasoning
Early read ~98 · not ranked · 1 of 4 benchmarks
| Benchmark | Result | Variant | z |
|---|---|---|---|
| GPQA Diamond | 95.6% | claude-sonnet-5-5_max | 1.56 |
Math
94 · rank 4 · 5 of 5 benchmarks
| Benchmark | Result | Variant | z |
|---|---|---|---|
| FrontierMath Tiers 1–3 | 88.8% | claude-sonnet-5-5_max | 1.28 |
| FrontierMath Tier 4 | 80.5% | claude-sonnet-5-5_max | 1.36 |
| OTIS Mock AIME | 100.0% | claude-sonnet-5-5_max | 0.95 |
| ProofBench | 100.0% | claude-sonnet-5-5_max | 1.75 |
| LMArena Math | 1510 rating | claude-sonnet-5.5-xhigh | 1.10 |
Writing
68 · rank 9 · 2 of 2 benchmarks
| Benchmark | Result | Variant | z |
|---|---|---|---|
| LMArena Creative Writing | 1465 rating | claude-sonnet-5.5-xhigh | 0.46 |
| LMArena Instruction Following | 1495 rating | claude-sonnet-5.5-xhigh | 1.03 |
Design
91 · rank 3 · 1 of 1 benchmarks
| Benchmark | Result | Variant | z |
|---|---|---|---|
| LMArena WebDev | 1774 rating | claude-sonnet-5.5-xhigh | 1.96 |